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Doubles?
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Posted by: 150rguy---------------------

Hey guys, Im going to be building a double above my house soon and I wanted to know what would be good angles and how long it should be, Im a novice so no 80' long things. But I wanted to know how long the table should be then how far tha launch ramp should be in front of it. Thanks.

Posted by: CHR!S---------------------

well, have you jumped before? are you agressive? do you have the huevos to jump a big double? the size of the jump depends on you, not what we say.

Posted by: 150rguy---------------------

ya i've jumped before, Im pretty agressive, I have enought power and the guts to try a double. At the last race I was in I could jump all the medium sized doubles but not the big triple.

Posted by: Motoracer13---------------------

Sounds like you need to find a track to ride at and get an idea of what you want first. If you have the dozer/bobcat at your disposal then start small and make longer every week or so until its the lenth you want, just start small.

Posted by: 150rguy---------------------

I want something like a single launch thing then a table.

Posted by: 150rguy---------------------

And I don't have a local track so I can't go there. We will be renting the bobcat.

Posted by: Motoracer13---------------------

Whats the biggest table top youve done? For a beginer I would say if you have a 10' gap from peak of takeoff to start of tabletop landing then you want the tabletop landing to be 10'. You know kinda make = at first. So like a 25' gap make like a 25' T-top to land on. You have to kinda "feel" the angle of the takeoff to the landing. You dont want a jump that sends you strait up to land on a flat landing. Think of FMX ramps. The takeoff is super steep but then so is the landing. Its something that just takes practice!

Posted by: FruDaddy---------------------

http://www.racingsmarter.com/supercross_track.htm
Go down about halfway, there are several diagrams.

Then go to dirtwurx:
http://www.dirtwurx.com/main.cfm?mc...building_4.html

Posted by: Motoracer13---------------------

Those are some sweet links!

Posted by: HajiWasAPunk---------------------

something to keep in mind when building your own double, the maintenance on the first jump. Say you're comfortable with a 40 foot double, or single to table as you're describing. When the launch angle gets worn out on that single, that is now a very dangerous jump becoming harder and harder to clear.

Do you have access to the equipment to keep this up? Otherwise stick with tables, even when they get worn out they can still be fun and you don't wind up looking like wiley coyote after a cliff fall. My 2 cents from building a maintaining a small track on a 3 acres.

Posted by: High Lord Gomer---------------------

Quote:

Originally Posted by 150rguy

...Im going to be building a double above my house...

You sure your parents won't mind you riding on the roof?

Posted by: 150rguy---------------------

Quote:

Originally Posted by High Lord Gomer

You sure your parents won't mind you riding on the roof?

Nah I do it all the time

Posted by: just_a_rider---------------------

I hope you realize how much dirt it takes just to build a small double not to mention a table. Theirs at least a tandem load in my small 30' double and the ramps are only 3' high. Dirt don't go far when compacted. The best thing to use to build a jump is clay, it will take many many passes before a rut starts to form if constructed right by packing every layer you put on. If you want air you build your jumps on a 2:1 ratio meaning for every foot tall your jump is you go out 2 foot with the ramp measuring from the bottom out, this is concidered a pro class face, amature jump faces are built on a 3:1 ratio. How to do this. Start with figuring out how tall you want your jumps. Start at the center of where the jump is going to be. Take some stakes and drive them into the ground on each side untill you reach the hight you desire, say 4'. Take some masonry string and afix it tight from one to another, now measuring from the bottom of each the stake out to where your ramp will start 2' for every foot high your jump peak will be for a pro face, for amature go 3 foot for every foot tall. A 4' tall jump on a 2:1 ratio will have a ramp starting 8' from the center, a 3:1 ratio will start 12' from the center. Drive stakes here to. Now start laying your dirt in untill you have enough packing as you go. Once you have the thing in the basic shape start grading the faces making shure they are true and flat with no patruding lips at the top that will cause a back end to kick up.

Posted by: 150rguy---------------------

We have access to the dirt.

Posted by: whenfoxforks-ruled---------------------

Clay holds up pretty good.

Posted by: 150rguy---------------------

Yah how do you get clay to build with?

Posted by: whenfoxforks-ruled---------------------

Around here is almost all clay, the home builders when they dig a house foundation out are governed by building codes to remove the clay, no back filling with clay. Landscaping and track building out of clay is the ticket, it don't wear or need maintenance like dirt or sand. By the way , it hurts more if you fall on it and is slicker than ice when wet. Most indoor tracks and stadium style tracks use clay or some part of clay.

Posted by: 150rguy---------------------

yep

Posted by: cawkazn---------------------

something you could do, is buy a ramp, like the freestlye guys use. and have a mound of dirt for your landing. Than you can move the ramp as close as you want to the landing, and as you slowly get better move it back a bit step by step. I think that would be best. because its adjustable so you can always have it where you feel comfortable. If you look on youtube theres some like 7 year old kid doing the same thing and hes busting no footers and stuff. Im pretty sure thats what his dad did for him.

Posted by: 150rguy---------------------

Yea but I'm talking about a double to practice on for racing, not freestyle.

Posted by: cawkazn---------------------

it would still get you used to jumping a double, the only diference is the take off ramp is steel not dirt. but theres dirt doubles out there with the same kind of lip and all.. and the landing would be basically the same too. if I was lucky enough to have own some land ideally i would build my own track. if not that I would do what i said earlier, great way to practice

Posted by: cawkazn---------------------

Quote:

Originally Posted by HajiWasAPunk

something to keep in mind when building your own double, the maintenance on the first jump. Say you're comfortable with a 40 foot double, or single to table as you're describing. When the launch angle gets worn out on that single, that is now a very dangerous jump becoming harder and harder to clear.

Do you have access to the equipment to keep this up? Otherwise stick with tables, even when they get worn out they can still be fun and you don't wind up looking like wiley coyote after a cliff fall. My 2 cents from building a maintaining a small track on a 3 acres.

this is something else to think about. if you decided to go with my sugestion you wouldnt have to worry about maintaining it much. you might want to check this link out.

http://images.google.com/imgres?img...-1%26safe%3Doff

Posted by: FruDaddy---------------------

Quote:

Originally Posted by cawkazn

If you do decide to build a ramp to help you learn to clear a gap. you should cut it down a bit shorter than a standard FMX ramp. In the pic below, I noticed a joint just above the guys waist, this would be a good place to stop building. Keeping it shorter, and less steep, will keep you from being chucked too high into the air.
http://www.fmxschool.com/images/ramps_sidebyside.jpg

Posted by: 150rguy---------------------

Quote:

Originally Posted by FruDaddy

That would be a good place to stob building but were probably using dirt.

Posted by: KX250Dad---------------------

Look at this using "pain" as your guide. Build a 6' high x 3:1 and place it 20' in front of a 40' table. Thus, should you not quite be able to jump onto the table casing the face of the table won't kill you (providing you have some suspension). Being a novice rider jumping onto the table most likely won't be an issue. Clearing the total 60' will happen over time. Key, the leading face of the table should be rounded so when anyone comes up a bit short they at least continue to roll forward, and the landing of the table should be somewhat long and at a similar angle to the first hill.

If you own or have access to equipment I will hate you. This having been said... should you be like my son and I and the boss only affords you a loader for a week one time a season maintenance now becomes a big, BIG issue. Roll all take offs, keep the take off at the 3:1 however on the backside do 4 or 5:1 this effect will reduce break down of the peak of the hill and make it easier to repair over the season.

Lips and ruts are a fact of life and while a perfectly groomed face and entrance is ideal seldom will you encounter this during the second moto of a race. Ruts make good practice and lips make better bike / body control.

Make sure your riding buddies don't grind the peaks when rolling. Those who don't have to build or repair your track will roost the peak for fun... Chances are they don't think about it, a friendly reminder generally works.

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