3336 Catapult Prototype

[MichaelBick]

Originally Posted by Brian C

This may not actually be correct.

There is more pushing force in the pneumatic cylinder as there is more surface area on the piston being pushed by the air. There is less force when retracting (pulling) due to there being less surface area on the piston face. This is due to the shaft attached to the piston.

While this may not sound like much it can be significant depending on what you are trying to accomplish.

I didn't think about that, but you are correct. Regardless it is unlikely that Aroki's success is correlated with pulling instead of pushing but rather the angle and position that the pneumatic cylinders are pulling at.

[DRH2o]

Originally Posted by MichaelBick

I didn't think about that, but you are correct. Regardless it is unlikely that Aroki's success is correlated with pulling instead of pushing but rather the angle and position that the pneumatic cylinders are pulling at.

However -- Pulling is going to gain a great deal of speed due to the volume needed to fill the cylinder is reduced. I understand you can gain the same speed pushing by introducing the exhaust from the solenoid back in with the input air -- have not tested it, but will tomorrow.

[MichaelBick]

Originally Posted by DRH2o

However -- Pulling is going to gain a great deal of speed due to the volume needed to fill the cylinder is reduced. I understand you can gain the same speed pushing by introducing the exhaust from the solenoid back in with the input air -- have not tested it, but will tomorrow.

Or you can push with smaller cylinders

[Aroki]

I worded my response earlier pretty poorly, I wasn't talking about the difference in speed/power between a cylinder going in or out. I was merely making a point about using a lever to account for the slower speed of pneumatic cylinders as opposed to elastics or springs. The ri3d and several other places that said pneumatics don't work for shooting since they aren't fast enough were either placing the cylinders to far from the fulcrum or trying a punch, where the slower speed is a huge problem.

[thursam]

Here's the intake system, as requested;

http://www.youtube.com/watch?v=2T0Mk...eature=mh_lolz