Quote:
Originally Posted by PAR_WIG1350
How would one recommend keeping up with the demands of a pneumatic engine? What bore and stroke should we use (assuming stroke = 2 times the crank pin's offset from the crankshaft axis), What type of solenoid should we use to handle the high-ish switching frequency (and what control method should we use)?  |
I'd say a boatload of pre-pressurized storage tanks, 3/4" bore pistons for speed, maximized (within reason) crank pin offset to maximize effective torque of the pistons (maybe 8" stroke, 4" offset), and no clue on the solenoids
I'd certainly be up to the challenge if I were still around next year.
Edit: I just ran some calculations, and this actually kind of looks easy
. According to the motor curves, the maximum CIM torque is 340 oz-in. If we use 3/4" bore pistons, our force at 60 psi is about 25 Ibs. Moving along, let's say we're using 4" stroke pistons, with a 2" offset from the drive shaft. 25 Ibs * (1/6' [=2"]) = 4.167 ft-Ibs = 800 oz-in. If we end up using two pistons (mounted 90 degrees with respect to each other, to prevent the engine from catching in place/going the wrong direction) that's
1600 oz-in. That's more than enough to replace two CIMs on a toughbox, a max of 680 oz-in, or anything else for that matter. One of these 2-piston engines on both sides, and you're more than set.