RE: Pneumatic Retract Question
Well electrifan!
A complete system will include the gear, a actuation valve, air tank, tubing, a fill valve and connectors. You'll need only one servo for operation. A mini servo is adequate.
The number of cycles depends on the size of the air tank installed. CJ will do about 6 to 8 cycles with the tank they supply for there .60 size systems.
As for pumping them up! The ROBART hand punp is junk, the only thing that really works on it is the pressure guage. Most guys use a 12 volt emergency auto air pump that has a built in pressure guage. I've also seen some guys use a bicycle hand pump, they work well also.
Follow the manufacturers installation operating instructions and you should have few problems! Good luck and have fun!!! [&:]