Radial Engine, Rotary, 1910s

cults3d

This model is a replica of an early aviation piston engine used in aircraft from the 1910s, over a century ago. Although the materials and manufacturing technology were not available at that time, it features a design conceived with wisdom and foresight. There were several similar engines during this era, but this model boasts unique characteristics. ① The rotating cylinder is designed for cooling purposes, while the cases are primarily made of steel and carefully machined. ② The crankshaft is securely fixed to the fuselage. ③ The valve arrangement is a notable feature, comprising: - An inlet valve built into the top of the piston, which opens and closes due to internal pressure within the cylinder. - An exhaust valve mounted on top of the cylinder, opened and closed by a push rod. ③ Exhaust valve opening/closing mechanisms involve gears, plate cams, and tappets. ④ A gear unit drives both the high-pressure magnetic generator (magneto) and the lubricating oil pump. ⑤ The intake tube and throttle valve are connected to the inside of the crankcase. ⑥ The ignition distributor, cable, and spark plug are also included. ⑦ A wooden propeller is provided as a dummy model. Additional features include a hand-turn knob for the magneto and oil pump. Alternatively, a device powered by a 6V battery motor can be added (see video). Note that if a motor is installed, the turn knobs cannot be used due to excessive drag from the motor's reduction gears. This is a rotating model with partially visible internal components. A detailed assembly manual in PDF format, consisting of 29 pages, is available. It includes parts lists, after-printing treatment instructions, and step-by-step assembly procedures based on standard skills (filing, drilling, tapping, and painting). For purchasing parts information: - Bearings: 6800ZZ (x2), 6801ZZ (x1), 6803ZZ (x1), 6804ZZ (x1), WBC6-12ZZ (1) - Aluminum Tubes: φ2, 3, 5, 6, 12 (see parts list) - Screws: Micro screws M1.4 x 3.5L & M1.4 x 6L - direct screw-in to a 1 mm diameter hole (no nut). If you have an M1.4 tap, it will be very useful. Screws M2 x ** and M3 x ** - see parts list. The STL file package includes 58 items, including the stand and tools. The "ws" suffix on the last two digits of each file name indicates that they are designed with support structures. Total net print time: approximately 76 hours - Estimated based on PLA material, a 0.4 mm nozzle, 0.2 mm layer height, 40% infill, no raft, and no support. Note: Actual print parameters may vary depending on your experience. Printing settings: - Raft, Support, Layer Height, Infill: adjust according to your expertise. My models were printed using the "idbox" with a 0.4 mm nozzle and 1.75 PLA filament. I wish you every success!