What's the best angle and length to make a mountain bike jump?

The best angle and length for a take off and landing made out of dirt for a mountain bike jump. Also how far apart should the landing and takeoff be This jump is for a height of about 8 feet in the air with the smallest possible takeoff
 
Smallest possible takeoff and you want to go 8' high.....how about a 12 degree pitch (angle) about 5' high and at least 14-16' apart should do it at a bare minimum of 12 mph....that sounds about right. No I didnt take the graph paper or the calculator out but Ive been jumpin for a while now and that just sounds about right for that height. you are going to need at least 25' to get going that fast and you better pound on it too!
 
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