Building Jumps

[xXxYZxXx]

I'm trying to build a jump in my backyard....with a friend and some shovels....not enough money to rent a bobcat, but anyway...how would we go about it? Like how far would the landing ramp have to be from the jump dependings on feet...or the angle of the jump, how high, any amount of info would help...thanks

 

[Glitch]

This site has a lot of good information on track building.

If you are forced to built a jump with nothing but shovels, I suggest you make a base for your jump making one out of wood. Make a small jump using 2x4' or 8's, then pile pile dirt on top of it and shape the ramp.

 

[Racer#213]

It may be the kind of dirt i used, but when i built my small one in teh by, i had to get it watered down with thet hose and pack it down wet, or else my tire would just sink into the dirt.

 

[dead]

If you can afford it call your local top soil companies and see if you can get some crappy dirt. When I lived back home I saved up 130 bucks for dirt. It got me 3 huge dump truck loads in our yard. I used some old lumber and logs to help me build my jumps. Trial and error is how we got our landing jumps figured out. I would build a jump and hit it at about the speed I thought I would be traveling. I marked the spot and built the support ramp a foot or two behind it. Heh:)

 

[Patman]

Be very careful what you use for fill on your jumps! Dirt or rock is obviously the best since it's not going to deteriorate like metal or wood. Imagine what a suprise it would be to hit the face of a jump and have it collapse because the 55 gallon drum you buried rusted through or the wood frame ramp rotted :confused:

 

[Papakeith]

Hopefully, he is suggesting using logs on the bottom as fill; not a wood frame with dirt on it. While not as good as stone, a couple of logs under the dirt don't stand the same chance of collapse.

 

[Patman]

I don't know about that PapaK :think: Ever seen MXBundy play Paul Bunyon? "Tree? What tree?...

 

[slo' mo]

be sure to make the takeoff jump long enough to get both wheels on the face of the jump at the same time to avoid having the back end kick up and toss you over the bars.

Most everything I have read dictates a 30 degree takeoff ramp and 20 degree landing ramp. Seems to work well, but be sure to water as you are building it to pack the base.

 

[xXxYZxXx]

I read the thing on jumps..and am building it at 30 degrees... should the jump have some sort of incline on it inside of just a straight jump, or will that screw it up...also, how long should the takeoff jump be?

 

[fastmofo250]

if you have an incline your gonna get hight which i like, but if its a straight jump, then your going to be getting distance. so i guess i would put a little incline in it.