Compressed Air Engine (working)

thingiverse

Engine is now in operation and can sustain itself upright. It's running smoothly, as shown in the attached video: https://www.youtube.com/watch?v=M-DI3TNrwx4 Please share your builds! ***8/2/20 Engine improvements include stronger conrod design and two bearings on each end, a keyed crankshaft, and flywheel, allowing for higher RPMs and power.*** ***31/1/20 Valve ring fitment was updated to improve its hold, a piston ring was added for better sealing, and the engine was fine-tuned for efficient running with more power.*** ***12/1/20 Fine adjustments were made to fit and prep for piston rubber ring setup, smoothing out the idle by making slight changes to valve timing.*** ***3/1/20 Slight adjustments were made to valve delay using piston nipple length, closed the gap at TDC, adjusted exhaust height, strengthened crankshaft, and made other small changes.*** ***1/1/20 A complete re-design of the valve system was implemented, replacing the spring and printed valve with a new chamber for pressurized air. Standard 6mm BB and delayed re-seal setup are being used; testing is ongoing but the engine runs! New seal requirements will be listed as needed.*** ***23/12/19 Multiple changes were made to smooth out design, strengthen it, tighten clearances, and make printing easier. The flywheel was updated to stop any crankshaft movement and a prop spacer was added.*** ***21/11/19 Mounting points were updated for better O-ring fit and general improvements.*** ***13/10/19 Overall changes were made, including smoothing and fitment with a flywheel allowing prop usage.*** ***19/9/19 Adjusted mounting locations to lock down bearings better, slightly tighter thread holes, and other small fixes were implemented.*** ***15/9/19 Fixes were made to piston and conrod, loosened M3 fit for top and bottom end, and changed air nipple.*** This is an attempt at designing a working and sizeable compressed air engine that is mostly printable with few external parts required. Feel free to try it out and provide feedback as I continue to print and test; I'm still learning CAD design. Required components: * 1 x Standard 6mm air soft BB (new valve) * 2 x 35mm x 1mm OD O-Ring (head seals) * 1 x 5mm x 1mm OD O-Ring (new BB valve seal) * 1 x 28mm x 1mm OD O-Ring (Piston ring) * 10 x M3x20mm bolts (for fusing points) * 1 x M3x70 or shorter for crankshaft prop mounting * Some form of propeller or spin-able weight to act as a true flywheel I'll add other requirements as needed. Thanks for looking!