Radial Engine, Sleeve Valve Type

cults3d

Most aircraft piston engines use the Poppet Valve mechanism (Cam, Tappet, Pushrod, Rocker arm, Valve spring, Valve), but I learned that engine was developed having the completely different mechanism named as "Sleeve Valve" in the 1930s to 1940s. The features of "Ssleeve Valve" are said to be that the shape, size, and number of intake and exhaust valve ports can be ideally designed, and that the tapping noise of the Poppet Valve is eliminated. Many companies around the world tried to develop this feature, but it seems that only company "B" in the UK was able to put it to practical use. It seems that it was not in time for World War II, but it was used until the Korean War. I learned that this type of engine is still participating in air racing. The historical background and topics of this engine are detailed in the following books. I was also very interested and tried a functional model. When I made it, I felt that if the jet age was delayed, it might have jumped into the leading role of the piston engine. A. Features of this model ① Single Sleeve type (initially double sleeve) (4 ports) ② Sleeve Drive Gear, Crank and Ball joint ③ Upper and lower split Cylinder (Exhaust port (x2), Intake port (x3) in Lower) ④ Exhaust duct (x2), collective Intake duct (x1) "Features not directly related to Sleeve Valve" ⑤ Supercharger ⑥ Bevel Gear type Reduction Gearing ⑦ Auxiliary equipment(Simplified), Dummy Propeller ⑧ Rotational Tools - Finger type and Motor type I think it's interesting to compare it with the "Radial Engine (RE-01)" that I made earlier. These were output powered up due to 14, 18 cylinders, etc., and were used until the jet era. [Video]https://youtu.be/zZdAAq5jaWY B. Assembly Manual (PDF format, total 27 pages) The detail assembly manual including "Parts-List", "After printing treatment" and "Assembly procedure" are prepared based on "Standard Skill (Filing, Drilling, Tapping and painting)". C. Purchase Parts Information; - Bearings- 6900ZZ(10x22x6)(x2), 675ZZ(5x8x2.5)(x7), 6803ZZ(9x17x5)(x1) - Aluminum Tubes φ3, 4, 5, 6 - See Parts List - Screws Micro screws M1.4x3.5L & M1.4x6L - Direct screw-in to 1 mm dia hole (No nut) But if you have the M1.4 Tap, it will be very useful. Screws M2 x ** -, M3 x ** - See Parts List - Rod and Wire - φ1 Piano and φ2 Brass D. STL file Total STL files are 82 items including the stand and tools. “ws” of last 2 digits of file name means “With Support” special designed. For Cylinders, STL files without support are prepared as option. E. Total Net Print Time: Approx. 105 HR - (Estimated as case of PLA, 0.4mm Nozzle, 0.2mm Layer Height, 40% infill and No raft and support) Note: When at actual print, each parameter may be adjusted by your experience. F. Printing settings Raft, Support, Layer Height, Infill: Depending on your experience. My models were printed by "idbox" using with 0.4 nozzle, 1.75 PLA. I do hope your success!!