[MisterStig]

Originally Posted by Sasha

just FYI: last year, the slope of the ramp was 18 degrees: http://www.usfirst.org/sites/default...CTIONSEPT6.pdf. Given that we can increase traction by using materials other than plain plywood, I think that 20 deg would be OK.

I would agree that 20 degrees is safe and maybe also 25. I also suggest adding non-slip material, such as the stuff used on stairs.

If you have the time, you can test your ramp by building some simple robots. Try using different will sizes/types and also make the robot different weights.