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  1. #101
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    Here are some pics of a jump park called The Lair in Bend, Oregon. We just finished our spring build sessions. We had 39 people show up to a weekend build day!!!

    Lower section of jump lines.
















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  2. #102
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    Nice!
    Transition Bank
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  3. #103
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    Quote Originally Posted by NastyNick
    Here are some pics of a jump park called The Lair in Bend, Oregon. We just finished our spring build sessions. We had 39 people show up to a weekend build day!!!
    A lot of great-looking stuff there!! Maybe you could elaborate a little (as far as this being the DJ, Pump Track "plans") thread . . . with some of the measurements, spacing, techniques etc. used ?

    Do yall have a water source to water the jumps? Is that all native soil (if so, it looks surprisingly good)....

    I like how yall made landings a little stepped-up and big and wide--that will definitely help the durability.

  4. #104
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    Quote Originally Posted by Flboy
    My freinds and I are going to build a DJ park and a Pump track. I have been doing a lot of research trying to find the best set I can find. So does anyone have and good suggestions of webpages or any links that could help me out. I did get the e-book from leelikesbikes.com.

    Thanks
    This ist the gayest thing Ive ever read. You need an instruction manual to dig and pack dirt.


    If it (roller, berm, whatever) sucks dig it up and move it.
    believe in yourself! I believe in you!

  5. #105
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    Quote Originally Posted by Grizzy
    This ist the gayest thing Ive ever read. You need an instruction manual to dig and pack dirt.


    If it (roller, berm, whatever) sucks dig it up and move it.


    Sure, for someone who has already ridden different spots and knows the basic designs already, then a little trial and error is fine (and usually necessary). But, this whole thread is designed to assist beginners and people who want to try to get it better the first time.

    There have been so many times I have seen things built not right, get torn down and re-built not quite right again, then get abandoned. And I also have met quite a few experienced, rad riders, who can't design and build trails for sht. And I also know guys who are not great riders, but who are great designers/builders. Most people don't see what goes in to good design. Bystanders just see piles of dirt, while many riders don't think, just ride. A lot of times, a setup will work okay, but a different design could improve it immensely.

    Maybe I pay a lot of attention to measurements etc. because I've built a lot of ramps--from backyard half-pipes to private and public bike/skateparks... There's something to be said with looking at plans and doing stuff right.

    Here are some guys designing and building professionally:
    Inside Earth Ramp Dirt Park Construction
    http://espn.go.com/action/bmx/blog/_/post/5364197

    Last edited by cmc4130; 05-11-2011 at 07:07 PM.

  6. #106
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    New city-sponsored jumps
    Tom Brown Park in Tallahassee, Fl.

    http://www.ridemonkey.com/forums/sho...d.php?t=242376

    this is a good example of how to improve a typical tabletop. ---> make it a step up, where the landing is taller than the launch. the reason step ups are so common in dirt jumping is that a bigger landing has more space for the wheelbase of your bike to land.

    note especially, the curved over landing-edge. much smoother than a hard-corner landing edge.




    here's are two other examples of the rolled-over or curved landing edge on a step up . .. this time at wood bikeparks:


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    although some builders do build the sides and back of a jump almost vertically (see second pic below), it is more typical (and durable) to have your jumps somewhat Pyramid shaped. and if they're slanted, this means the base of your jump is going to be a lot wider than at the top, or the lip. this means that the base (or "footprint") of the launch is going to be like a big rectangle on the ground. you mark that out to start with and build the entire base and pack it down. then you add the next layer, pack it. then the next layer etc. like Aztecs or Egyptians building pyramids. this also makes for easier packing because it's a lot easier to pack downwards than to pack sideways later (trying to make a jump wider).



    Pyramid shaped jumps. very sturdy/durable:

    from
    Oregon Trails
    http://www.ridemonkey.com/forums/sho...d.php?t=233036

    Vertical sides & back. No question it looks rad, but it will be less durable. Especially if you're not using premium clay. Places that have amazing clay like in this picture are better able to stack and pack vertically.


    If you're doing the pit/bowl method of building (where you get the dirt from the riding line) you'll notice that a lot of the "base" of the lip is part of the natural earth already there . . . . this is the most efficient way of building.



    You can also find a natural decline and build a landing extension at the top of it, like this:


  8. #108
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    another example of the "pyramid" sides to launches and landings . . . . brought to you by the All-Star digger crew for Odyssey's Texas Toast jam which is happening this weekend in Austin:


  9. #109
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    Well I've got dirt coming this weekend. I'm getting 6 dump truck loads which is 72 yards and renting a skid steer. I'll take pictures and keep you guys posted.

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    I guess this hasn't come up so far . . . . but it's worth mentioning that pump track style features can be made of lumber. Either in the freeride-ish planky style or in the smooth-plywood bmx park style.

    Ray's MTB has one of the best known:



    Here's an outdoor one (with the 2X6 planky style). . . at the Burnaby skills park:


    Good wood-berm view:


    Not real psyched on the particle-board, but has some good shapes:

  11. #111
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    We want to build some dj's up in a forest spot we ride. This would all be done by hand using existing dirt and downed wood. Is there a recommended wood to dirt ratio? Thinking about base and 3/4 of lip/landing wood and the rest dirt?

    We could build the line using the pit/bowl method and eliminate most of the wood. But lots of planted trees and roots that make deep digging a real pain. Also, lots of rain during some months, so kinda worried about drainage issues with this method.

    Any advice would be awesome!

  12. #112
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    The less wood, the better. When the wood starts to break down/rot, your jumps will suffer.

    Also, if your dirt isn't thick enough, when you need to make repairs (and you will) the logs can often reveal themselves right where you don't want them. You can't shape a lip with a log sticking out of it....

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    Lots of good info, thanks

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    I know a guy who travels all over building pump tracks dj and all kinds of dirt features if any one is intrested. They Just came to tallahassee and did some stuff here.

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    Just got done marking out a pump track in my backyard cant wait to get dirt and get started. Goona feature it on my site.
    Soil Taste Tester

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    I'm thinking about building a pump track in my backyard. The area that I'm using is on a slight hill, so I'll have a natural drop in, but my big concern is getting back to the top without having to do a ton of work. Any suggestions as to how to build to get back up a little easier?

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    Quote Originally Posted by K9Self View Post
    I'm thinking about building a pump track in my backyard. The area that I'm using is on a slight hill, so I'll have a natural drop in, but my big concern is getting back to the top without having to do a ton of work. Any suggestions as to how to build to get back up a little easier?
    There are several options. Upgradient rollers do work if they are carefully spaced and sized (we have upgradient rollers at my spot); you can also have upgradient jumps, where each set is a step up. The best option in my opinion though is to build a large structure at the low point of the property which artificially creates elevation and therefore generates kinetic energy--it can be a roll-in, a bank, a large quarter pipe, a quarter pipe to wallride, etc. See: Roll-ins - Ridemonkey.com. This is frequently done in skatepark and bikepark street course design.


    Although it's at a skatepark--this is a weirdly accurate replica of bmx style step-up rollers, or what could be also called a rollable double. For your upgradient rollers, it will be good to use this type of shape, because in a sense, a step-up is like a ladder that is getting you up the elevation, yet still giving good backside for your wheelbase to compress on to pump you up the gradient.


    Check out SPA Skatepark Design&Build; they are an excellent contractor here in Austin. Although most people don't think about it, there's a lot of design principles which apply to both skateparks and pump tracks--in both spots, you are engineering flow, with curves and spaces designed to not require pedaling (or kicking, with a skateboard).

    SPA Skateparks: Professional Skatepark Design. Design/Build Skateparks. Skatepark Construction. Skateboard Park Contractor. Skatepark Consultation. Custom Concrete Skateparks. Wooden Skateparks. Backyard Ramps. Skateboard Production Events. Contests.
    Last edited by cmc4130; 09-12-2011 at 01:21 PM.

  18. #118
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    Thanks cmc4130 - I think I'm going to try the rollers and see how that works out.

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    Quote Originally Posted by K9Self View Post
    Thanks cmc4130 - I think I'm going to try the rollers and see how that works out.
    cool, but i really think it's worth considering a wood build up at the low end of the property if you can. as i said there are a lot of varieties. look at it this way---it's actually cool that your area is not flat because you get to have a more unique setup....


    1. Wallride
    Highland MTB Park:


    2. Quarter pipe


    3. BMX-style Vert Wall (Quarter Blending into Vert Wall).
    This would be overkill for your pump track, but I'm including it just to illustrate the idea. BMX vert walls are one of the best speed-generators ever invented.


    4. Roll-in.
    I took this picture at Whistler Air Dome.


    5. Curved Slant Wall aka wood berm Technically a slant wall or "bank" is not a wall-ride; only vert walls are really walls. If you have a 180 berm on your pump track and it's at the lowest elevation of the your slanted yard, you may consider a curved slant wall all the way around the berm so that you can carve up it and get some height, generating more speed to go back up the gradient with.

    Winter Park:


    Diablo:

  20. #120
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    CMC you've convinced me to go with a wooden berm. So I've been researching/reading up on how to build one. I'm thinking about doing a 7' x 3' high berm. Using 1x6 for the planks. As for the posts I'm going to bury them into the ground and connect them horizontally to complete the frame. Any suggestions or tips on building the frame? I'm a visual person so I started looking thru pics for some ideas on how to build I found this picture. I really like how the berm starts level with the ground. I'm not going to be going that vertical with mine, but I like that idea. Opinions?
    Attached Thumbnails Attached Thumbnails DJ , Pump Track plans-cf_wallride.jpg  


  21. #121
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    Quote Originally Posted by K9Self View Post
    CMC you've convinced me to go with a wooden berm. So I've been researching/reading up on how to build one. I'm thinking about doing a 7' x 3' high berm. Using 1x6 for the planks. As for the posts I'm going to bury them into the ground and connect them horizontally to complete the frame. Any suggestions or tips on building the frame? I'm a visual person so I started looking thru pics for some ideas on how to build I found this picture. I really like how the berm starts level with the ground. I'm not going to be going that vertical with mine, but I like that idea. Opinions?
    3' is pretty short. if you want a short berm (whether wood or dirt), then it has to be steep-faced to work well.

    like this:




    the other thing is that a large radius turn soaks up speed while a short radius turn can help you maintain or even generate speed. if you have a 90 degree turn pointed back up gradient, then it's gotta be something you can "whip" out of.

    i want to keep this thread as general "plans" though, so if you want to keep discussing your specific layout, let's make a new thread. take some pics of your spot. how much gradient is there?

    also check out this thread. it had a similar question:
    help with jump line into berm - Ridemonkey.com


    this is a photo i took of the pump track at Whistler:


    note how steep/transitioned the faces of the berms are. this is the best way. they need to look like skateboarding bowl corners. you can't "whip" around a mellow-faced berm. you have to be able to get pinned sideways if you want to go fast.

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    New thread & pics of my area up - suggestions appreciated.

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    here's a drawing i did to illustrate two potential roller designs. clearly, dirt doesn't have to be exact, but i'm working on a project right now where we'll be using lumber, so they've got to be more exact....

    note the 2 styles of "dome." on the second set, the domes are mirror images of the bowls. by knowing that you're going to use 30 degrees of arc for each section, you end up with a certain spacing--in this case 2 foot tall works out pretty close to 15 feet peak to peak.

    larger rollers like this are good when you want to feel the whole wheelbase of your bike going up and over. a typical wheelbase of a dirt jumper is about 42" (axle to axle) or 68" (5'8") for the bike length with the wheels. so you can imagine there are a little less than 3 bike lengths from low point to high point to low point in this wave pattern. (3 exact bike lengths would be 17 feet.)



    i paced these rollers at Whistler at 20'-22'-ish feet apart. so definitely keep in mind that when you're going fast (like on these Flow-DH trails), rollers can be well-spaced.
    Last edited by cmc4130; 09-24-2011 at 08:19 AM.

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    great read here. this has helped a lot with my ideas for our local trail. while not a pump track i did pick up some ideas on designs for rollers and berms for our single track.

    thanks for this link cmc!

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    Quote Originally Posted by cmc4130 View Post
    for going up a slight incline or gaining speed from a slow speed consider an accelerating rollers design:

    I wish I would have seen this thread earlier, I just spent the whole day building rollers and I feel they are to close to each other. I think I'm going to re-work them and go for some accelerating rollers. Would the rollers you pictured here work with the small rollers going to large and then back to small? I would like to have the accelerating effect from both directions with a small gap jump at the largest roller that can also be jump in both directions. What would you recommend the spacing from peak to peak be for the 1',2',4' and 8' rollers?

  26. #126
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    pencil and paper I love, but sometimes you gotta start moving dirt and see how things come along. This "PT" will be very bmx trackish. Less leelikesbikes and more bmx rhythm section dimensions.










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    Quote Originally Posted by Grizzy View Post
    This ist the gayest thing Ive ever read. You need an instruction manual to dig and pack dirt.


    If it (roller, berm, whatever) sucks dig it up and move it.
    I too thought it wouldn't be a big deal to move a roller/ reshape a berm, but it's much more difficult to move that dirt the second time (after it's been packed-watered-packed-watered-packed-watered etc) than to put it in the right place the first time. Good plans are imperative.

    We (my 14 year old son and I) built a pump track in our back yard. Had 3 1/2 truckloads of dirt hauled in and dug another 1 1/2 - 2 truckloads within the yard. Sixteen 18 - 24" rollers and six 36" to 48" berms. All by hand. We had to move a couple of the rollers and it was a major pain in the butt.

    My advice to anyone building a pump track would be to put the dirt in the right place the first time. The more times you have to move dirt, the less time you have to ride.
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  28. #128
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    a pic of some rollers my bros Abel and Tony and I built recently (with help from Myles and El Paso friends). i did roughly 14' center-to-center spacing and deliberately made them a little taller and steeper than normal because it's an upgradient line (getting you back up to a starting area). may have to adjust a little after they get fully ridden in.


    Allied Compound -- End of the World Jam - January 2012
    Last edited by cmc4130; 12-27-2011 at 09:58 AM.

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    That looks sick!
    Should definitely get your heart rate up.

    What's it like trying to make that curve at speed with no berming?
    Before we got our track dialed in we had a roller at the exit point of a berm that was tilted out and was literally throwing us off the track at speed because the next roller was set in a little to avoid a light post (yeah, we were being thrown into the light post). We tilted the roller to the inside and extended the berm on the outside of the roller and it made a huge difference.

    I know y'all have already built a bunch of lines, so you probably already know this.

    Will this be a part of the fastest lap for the End of the World Jam?
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  30. #130
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    Quote Originally Posted by mtlatham View Post
    . . . .
    What's it like trying to make that curve at speed with no berming?

    . . . .
    Will this be a part of the fastest lap for the End of the World Jam?
    good question. it works fine. the perspective is hard to get with the photos, but it's a pretty huge radius curve. the other thing is that you can have rollers around a curve without a berm per se because each time you get a little bit weightless over a roller you can adjust your bike position slightly (kinda like having tiny hip jumps). and yes, i definitely also recommend the tilted-roller design in the right circumstances. it's actually a lot more fun to pump things that have slight turns than to just pump a dead-straight line....

    and yes, Hippie Josh was talking about the pump track for the 'fastest lap' ! . . . .

    here's an old pic (fall '08) of our tilted roller-table going into the big pit at WCPT:
    Last edited by cmc4130; 12-27-2011 at 10:30 AM.

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    Good job!

    This thread should absolutely be a "Sticky"

    The sheer amount of dirt and wood sculpture from dedicated people spending hours and hours to accomplish their goals in this thread is nothing short of amazing

    Looking at the pics shows there are "Dirt/Wood Artists" that can shape stuff to work for whatever they have in their heads!

    Fantastic info and display...
    ... everyone take a bow!

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    ditto!
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    There are some really badass trails in some of those pics. Makes me wanna build in my backyard!

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    Backyard Pump Track

    best use of backyard space = pump track

    We've lived in our house for almost 19 years. I've spent more time in the backyard in the last 6 months (we started building in June) than the other 18 1/2 years combined.

    Plus - cost is minimal if you do it yourself. Less than the price of landscaping one or two small flower beds. We did 16 rollers and 4 berms for less than $600. We're adding 2 berms, a table top, and 6 more rollers for another $200 worth of dirt (20 yards). Highest entertainment value per dollar spent ratio ever (oh, and you get most of it back just by canceling your gym membership...believe me, you won't need it anymore).

    Our plans and results:

    <a href="http://www.flickr.com/photos/73026863@N03/6595281107/" title="Backyard pump track plans by pumptrackaddict, on Flickr"><img src="http://farm8.staticflickr.com/7169/6595281107_5bfbde542b_b.jpg" width="1024" height="552" alt="Backyard pump track plans"></a><a href="http://www.flickr.com/photos/73026863@N03/6589630949/" title="Backyard Pump Track facing west (after) by pumptrackaddict, on Flickr"><img src="http://farm8.staticflickr.com/7019/6589630949_1693564bda.jpg" width="500" height="334" alt="Backyard Pump Track facing west (after)"></a><a href="http://www.flickr.com/photos/73026863@N03/6589630171/" title="Denton railing our backyard pump track by pumptrackaddict, on Flickr"><img src="http://farm8.staticflickr.com/7170/6589630171_1e08b8f5f0.jpg" width="500" height="333" alt="Denton railing our backyard pump track"></a><a href="http://www.flickr.com/photos/73026863@N03/6589631431/" title="Backyard Pump Track facing east (after) by pumptrackaddict, on Flickr"><img src="http://farm8.staticflickr.com/7026/6589631431_cca34ae4c7.jpg" width="500" height="334" alt="Backyard Pump Track facing east (after)"></a>
    Last edited by mtlatham; 12-29-2011 at 12:20 PM. Reason: added images
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    This is a little video I put together showing the progress of the build and my son riding it (skip to 1:43 if you just want to see the riding part):

    <object width="420" height="315"><param name="movie" value="http://www.youtube.com/v/uypXMhdXSOU?version=3&amp;hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/uypXMhdXSOU?version=3&amp;hl=en_US" type="application/x-shockwave-flash" width="420" height="315" allowscriptaccess="always" allowfullscreen="true"></embed></object>
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    Quote Originally Posted by mtlatham View Post
    This is a little video I put together showing the progress of the build and my son riding it (skip to 1:43 if you just want to see the riding part):

    Looks like it rides very smooth. What's the spacing on the rollers ? (I'm kinda confused by the drawing--the legend shows a distance as 6 feet,....)

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    Quote Originally Posted by cmc4130 View Post
    Looks like it rides very smooth. What's the spacing on the rollers ? (I'm kinda confused by the drawing--the legend shows a distance as 6 feet,....)
    Twelve out of 16 rollers are 10 feet apart and the other four are about 8 feet apart. All rollers are 18 - 24" high. Berm radiuses are 9', 12', 8', and 12'. I used Lee McCormack's Pump Track Nation ebook for the measurements.

    It does ride pretty well, but we're still working on the track smoothness. We have at least 4 different kinds of dirt, so getting them all to play well together has been a challenge. We're already battling berm erosion. It doesn't take too many little rivulet channels across the track to greatly impact the ability to maintain speed.
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    Wow, I want this in my back yard. You think these main rollers are about 4' high and 14' apart?


    Pump Track Session with Sik Mik - YouTube

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    Quote Originally Posted by JFoster View Post
    Wow, I want this in my back yard. You think these main rollers are about 4' high and 14' apart?


    Pump Track Session with Sik Mik - YouTube
    No, they're def not 4' high. Pause the video and compare them to his wheel size.

    One thing that's worth mentioning, is that rollers can be taller and peakier IF you intend to manual them. Many bmx race tracks have this steep-and-deep style of rollers. However, if you want the kind of pump track that feels more like waves, where you pump both wheels on the roller, then they must be mellower/longer and more spread out. If you try to keep both wheels down on peaky rollers, you have to work to press your front end down. You'll also see bmx racers pick their front wheel up before a roller and set it down on the backside. In effect this type of speed manualing is a work-around for a roller that is actually too peaky to pump both wheels on.... Not saying bad, just pointing out the difference...

  40. #140
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    Great thread!!! I'm seriously considering building a pump track at my house this spring. I've got 2 acres of land and a perfect spot for one.

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    Anyone know how much something like this COSTS?
    Im talking on a bigger scale though...NOT just a "backyard" park...but a "community, or commercial" park?
    Cheers

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    Quote Originally Posted by mtlatham View Post
    This is a little video I put together showing the progress of the build and my son riding it (skip to 1:43 if you just want to see the riding part):

    <object width="420" height="315"><param name="movie" value="http://www.youtube.com/v/uypXMhdXSOU?version=3&amp;hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/uypXMhdXSOU?version=3&amp;hl=en_US" type="application/x-shockwave-flash" width="420" height="315" allowscriptaccess="always" allowfullscreen="true"></embed></object>
    If that was my setup, I would totally have a spot to set on/ step off the deck.. Just saying..

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    Pardon my ignorance - "set on/step off"?
    We jump off the deck and bunny hop back on to it when we're just messing around, but I've been trying to figure out a way to incorporate it more into the flow of the track. I'm certainly open to suggestions.
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    Quote Originally Posted by mtlatham View Post
    Pardon my ignorance - "set on/step off"?
    We jump off the deck and bunny hop back on to it when we're just messing around, but I've been trying to figure out a way to incorporate it more into the flow of the track. I'm certainly open to suggestions.
    Exactly. Find a way to jump on and off the deck that would be very flowy.. Watching the video I wanted to hit a small jump up onto the deck and land in a manual across the deck and drop back onto the track.

    You sure have a sweet setup.

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    Ok here is our plan for a PT complex in Bagneres de Bigorre in France. Its 3 PTs that gradually have bigger jumps. Thanks for all the comments on this forum and especially the input from cmc4130. We will start with the smallest and probably adapt the plans for the bigger ones as we gain more experience. Have only built a couple of tiny PTs so far so will be a lot to learn. Original plan was to separate jumps and PT but seeing the posts and input from cmc4130 we've tried to integrate the jumps into the Pt so that you can ride a loop rather than a single straight of jumps. Will keep you posted as we start to build it.
    Pic here
    cheers,
    pat

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    trying to inline a pic!

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    Quote Originally Posted by fastfish666 View Post
    trying to inline a pic!
    looks sweet!! I see so many spots where there could be epic transfers.. looks like a track that wouldnt ever get boring..

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    Quote Originally Posted by fastfish666 View Post
    Ok here is our plan for a PT complex in Bagneres de Bigorre in France. Its 3 PTs that gradually have bigger jumps. Thanks for all the comments on this forum and especially the input from cmc4130. We will start with the smallest and probably adapt the plans for the bigger ones as we gain more experience. Have only built a couple of tiny PTs so far so will be a lot to learn. Original plan was to separate jumps and PT but seeing the posts and input from cmc4130 we've tried to integrate the jumps into the Pt so that you can ride a loop rather than a single straight of jumps. Will keep you posted as we start to build it.
    cheers,
    pat
    very nice computer graphics. i need to catch up with that--still doing pencil/paper protractor etc. !!

    my number one suggestion for your jump loop is to have some sort of artificial elevation to roll-in from to hit the jumps (and to get back onto when you come back around). you may even consider, two artificial elevations--one on each diagonal corner of the rectangle.

    we have a natural hill roll-in at our spot, (see for example). most people roll in and do one lap, although it's possible to keep going (i've done 26 laps, i might hold the track record, not sure ). but, if you notice, almost all indoor bike parks and skateparks use some version of this concept. riders hate pedaling from a stand-still to hit a jump on flat ground. everyone loves rolling in and naturally having speed to hit jumps. at the same time, on flat ground it's not that fun to try to use small rollers to gain speed to hit a jump. it's doable--especially if each roller gets progressively bigger (see the "Accelerating Rollers" drawing I did earlier in the thread, or roller-tables, monster rollers etc. but still, i feel like most riders will hit 4 jumps a berm another jump another berm a bunch of rollers after that single loop they'll want to chill for a minute and let somebody else go. a platform where everybody hangs out would be ideal. the platform should ideally be more than 8 feet tall. less than 8 is not really gonna do shlt unless you crank up to it or crank down it. 10 or 12 is ideal. it doesn't have to be a scary steep roll-in.
    check out the very first part of this video from Ray's MTB park. (actually if you ever get the chance you MUST visit there). every bike park designer must make the pilgrimage. Ray&#39;s MTB bmx helmet cam session - Mar 2011 - YouTube
    Note how these guys roll-in from an elevation. Then they hit some rollers that are pretty spaced out, then appear to drop down in elevation again. A two-tiered platform could be an ideal way to do it. I think I said it before in the thread, but almost all skatepark street courses operate on the "basin" principle. You have high elevation all the way around the park, whether by quarter-pipes, flat banks, wall-rides, whatever. You drop in from any part of the perimeter of the park, then you flow over things in the middle area, whether they are jump boxes, pyramids, grind boxes, whatever... then when you get to the other side you have some elevation to get up on to turn around. The same principle can operate with a dirt park, except rather than turning around 180 degrees like a typical skatepark you turn left or right 90 with something that acts as a berm. It can be a wood berm, or a hip jump.
    Check out this thread where I have a bunch of pictures and discussion of a loop options:
    http://www.ridemonkey.com/forums/f61...o-berm-241208/

    Lastly, consider that the shape of the track doesn't have to be a rectangle with rounded corners where each berm is a 90. If you tilt a rectangle over (a parallelogram) you get 2 mellow turns and two over-90 degree turns. Or, if you make the track triangular, you could have three 120 degree berms (or one 90 and two 140's) or whatever.... Also you can bend the long sides of a rectangle in so it's slightly peanut shaped. This will get a little bit of hip action in, and you won't always be going straight or turning left.
    I think I need to do some more drawings !!!!

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    thanks for the ideas. First up I only did the computer graphics because our local town planners wanted a 3D model so that they could calculate the volume of earth/dirt required to build the jumps, it was actually done in the Ship-Design software that I write for a living! I did all the original drawings with pencil and paper -- its definitely quicker! But I think the 3D models are quite useful when you are trying to present the idea to town planners etc who have no idea what you are on about. Actually -- originally I went one better and built a scale model (also occupied the kids and I on a rainy afternoon)

    If there is any interest, I was vaguely thinking about writing a plug-in for Google Sketchup to more quickly add standard rollers etc.


    Anyhow back to MUCH more fun discussion -- the track itself. The idea is that there are 3, essentially independent loops and the idea is that they get progressively bigger jumps and features. The loops are generally supposed to be ridden anticlockwise. There is a slight slope in the long direction of the loops -- you drop about 1m over the 55m length of the track.

    Its a bit lost in the perspective, but in the medium one the start hill is 1.5m (5ft) high and the main tables are 1m (3ft4in) high. I was planning similar in the big loop but I think I might have got a bit carried away and I think both the jumps and the start hill are a little under 6ft high. I might see about reducing the height of the jumps as the originally intended height was 5ft. Im a bit concerned about making the start too high as we do get quite a bit of rain here (and snow) and I was worried that it might all get washed away! But we are thinking of building the main features with rock/hardcore and just putting the final shape in with soil.

    Again I like your thinking of keeping it more "natural" -- the trouble with computer modelling is that its easier to do things in straight lines -- hence why its better to do it with pencil and paper :-)

    I remember the accellerating roller posts -- Have you tried them in a track? When I plotted them out, doubling the size each time seemed quite extreme? I was worried that it would be hard to make it over the last one if you were going up hill -- maybe smaller increments?

    thanks for all you help (my background isnt DJ, Ive ridden a bit of BMX race ovr the last couple of years, but Ive been mountain biking since the late 80s so thats more where Im coming from.

    cheers,
    pat

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    papier maché model of a small pump track -- was useful in explaining to the town planners what we had in mind!


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