2073 Pneumatic Catapult

[billbo911]

Originally Posted by buildmaster5000

What are the specs on the cylinder? Specifically bore and stroke length...

Really good question!
After trying a Bimba 178 (1.5"dia. X 10" stroke) we found we just didn't have enough height or distance out of our system. We run it at 60 psi which produces 106 Lb. of force.

So, our next thought was that the force was sufficient, but we needed more speed out of the cylinders. So, to maintain the force, we substituted in two Bimba 0910 (1 1/16"dia X 10" stroke). This yields the same 106 Lb. of force at 60 psi, and moves a lot faster.

An additional note here is that we are using low pressure storage tanks between the valve and cylinder. One per cylinder. This is done to maximize air flow to the cylinder by not restricting it as it flows through the valve.