HELP! Launch ramp curve measurements?

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HELP! Launch ramp curve measurements?
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Posted: Apr 1, 2016 at 11:08 Quote
Hey guys im planning on building a 3ft tall ramp just to mess around with in the garden,
It was going to be 1.5ft wide x 3ft tall x 5ft long, i dont really know what im doing as far as measurements go so this was all guess work, i understand you get different amounts of curve to the ramp but i dont know how much curve id want and i also dont know how id mark it out on the wood, all help is apreciated Smile

Posted: Apr 1, 2016 at 19:13 Quote
I don't really have any suggestions per se, but if I was doing it, I would want to make an accurate plan of what I was going to build first.
Have you ever heard of Google SketchUp?
http://www.sketchup.com
It Is a free 3d modeling program that is very easy to use. Just download it from the website.
You should be able to get all your measurements using this program.
Hope I am helpful.

Posted: Apr 4, 2016 at 12:26 Quote
Width:
2 feet wide is better than 1.5, as a rule of thumb, shoulder width has a nice feel to it. Wider depending on speed.

Height:
3 feet tall? You prob don't want to waste time cutting any curve for that, just make it an easy-to-build flat ramp and feather in the curve with dirt. In fact, it would take less time to pile up 3 feet of dirt than to build it out of wood.

Read these:
https://www.pinkbike.com/forum/listcomments/?threadid=29852

https://www.pinkbike.com/forum/listcomments/?threadid=178880

Also post up photos of your before / during / after so we can get stoked and learn from your experience

Posted: Apr 7, 2016 at 12:03 Quote
The key with shorter ramps is they need to be mellower than you think. If a short ramp has the same steepness (i.e. degrees of arc) as a tall ramp, it will feel stupidly abrupt when your bike hits it.

Bijou Bike Park, Lake Tahoe

For a 3 foot tall ramp, you probably should stick between 30 to 45 degrees of arc. A height that is half the radius length puts at around 60 degrees of arc. In other words 3 foot tall 6 foot radius would be 60 degrees of arc. But, that's still to abrupt for a short ramp (it's okay for a bigger ramp). So, I would do more like 11-14 foot radius and 3 feet tall. If it was a 5+ foot tall ramp, you could do 60-ish.



https://www.pinkbike.com/forum/listcomments/?threadid=29852&pagenum=87#commentid5031336

Note that you can still do serious tricks even when a ramp does not go up to 70-ish degrees of arc. This one is probably only around 55.


Greg Tait, Austin TX, photo by Octavio:

Posted: Apr 28, 2016 at 14:53 Quote
what CMC said. some terrain park builders use a rope tied loosely between posts to keep the right arc.

Posted: Feb 23, 2020 at 13:09 Quote
Flatter jumps tend to be better for full suspension bikes sending for distance.

Posted: Feb 24, 2020 at 8:06 Quote
I have a 2 foot tall booter in my back yard and it has a 3.5-foot radius. I would say that is one of the best transitions for tricks. I got the plans from a 6 foot tall ramp with a 10.5 foot radius but I scaled it down. I have it a bit angled so the front is higher than the rear by about 3 inches.

Posted: Feb 24, 2020 at 10:08 Quote
milesd2407 wrote:
I have a 2 foot tall booter in my back yard and it has a 3.5-foot radius. I would say that is one of the best transitions for tricks. I got the plans from a 6 foot tall ramp with a 10.5 foot radius but I scaled it down. I have it a bit angled so the front is higher than the rear by about 3 inches.

Got any pics of it?

This one looks roughly 18" - 24" feet tall:


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