making some North shore stuff and need some help- Mtbr.com

# Thread: making some North shore stuff and need some help

1. ## making some North shore stuff and need some help

Im making a 4' drop and dont know how tall to make the transition.also how far away from the drop should I set it. thanks. plus I will post some pics when its rideable.

2. i dunno man, 4 inches is a pretty big drop. Id say maybe the landing should be 6 incehs away

3. ## what

no man its 4 feet not 4"

4. ## ?

would 2' do it for how tall it should be come on guys I need some help

5. ## mmmm

-drop == 4ft. ->1.21m
-hypothetical velocity==15mph or 6.7m/s.
-time?
-x?
-g==9.81m/s squared

time= square root of 2y/g---sqrt(2*1.21)/9.8=.49s

x= Vxot--6.7m/s*.49s=3.283m

6. ## ok but im not big on math

Originally Posted by Jettj45
-drop == 4ft. ->1.21m
-hypothetical velocity==15mph or 6.7m/s.
-time?
-x?
-g==9.81m/s squared

time= square root of 2y/g---sqrt(2*1.21)/9.8=.49s

x= Vxot--6.7m/s*.49s=3.283m
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more help

7. -drop == 4ft. ==1.21m
-hypothetical velocity==15mph or 6.7m/s.
-time?
-x?
-g==9.81m/s squared

time= square root of 2y/g---sqrt(2*1.21)/9.8=
x= Vxot--6.7m/s*.49s=3.283m

So if you are going 15mph you will land
10.76 feet away from the 4 foot drop. The position of the transition
will be determined by how long and at what angle you want the incline to be. I havent build much north shore stuff but i would say you want the transition to be like 1.5 to 2 times the length of your bike. 25-30 degree angle.

8. ## thank you

:d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :d :

9. it depends mainly on how fast you are going to be going so you can just calc it again for what ever speed your normallly going on your trail

If i decide not to be lazy ill make a program in java for making drops and jumps that you can dl off my site.

10. ## that would be sweet

ya if you have the time that would help alot also whats your web page?

11. writting now be done eventually

12. build the drop 6 feet off the ground, build the landing 2 feet off the ground. make the gap 3 feet from the bridge to the landing Kapiesh??

13. it's 4ft just drop it..... seriously trial and error.... rake the dirt clean in front of the drop and getting cruising at the speed you will be going on average and just drop it...4ft even to flat is pretty minimal... when you land it, do it again and check to see where your landing...at that point build up if you want a tranny or gap........

14. Originally Posted by Felpur
it's 4ft just drop it..... seriously trial and error.... rake the dirt clean in front of the drop and getting cruising at the speed you will be going on average and just drop it...4ft even to flat is pretty minimal... when you land it, do it again and check to see where your landing...at that point build up if you want a tranny or gap........

yea that works if its a small drop but you cant do that for all.

15. Originally Posted by Jettj45
yea that works if its a small drop but you cant do that for all.

no man its 4 feet not 4"
I know, i was just bustin ure bubbel for writing 4" instead of 4' not the difference in apostrafes.

17. you loose a fair amount of momentum if you build 4' to flat, if you build it 4' to tranny you can keep you momentum up for the next drizzop.

18. yes, honestly when i build them i just guess i was just real bored so did math

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