Propfan Engine, Pusher Type using with Planetary Gearbox

cults3d

Propfan Engine", "Open Rotor Engine" and "Ultra High Bypass Engine" were developed as "Advanced Turboprop Engine" to achieve high flying speeds while maintaining fuel consumption similar to that of "Turboprop Engine. Several types of engines exist, including: - Puller (Retract) type: Contra-Rotating Propeller (Fan) with gearbox located at the front like common turboprops. - Pusher (Un-Ducted Fan) type: Contra-Rotating Fan without Gearbox is located at the rear. Development of these types seems to have been interrupted due to noise problems, etc. Please refer to my creation: https://cults3d.com/en/3d-model/tool/propfan-engine-pusher-type - Pusher (Planetary GB) type: Contra-Rotating Fan with Gearbox is located at the rear. This type has recently been developed in Europe. I am very interested in "How it works," so I tried to make it. A. Features of this type engine: 1. Power turbine drives "Fans" through "Sun Gear." 2. Planetary gearbox produces two outputs to drive "Fans" through "Planet Carrier" and "Ring Gear." 3. Torque of the two outputs is controlled by each stage of "Fan Blade Pitch." 4. Blade Pitch Change Mechanism and Control Method (System) are crucial. B. Features of this model: 1. Power Turbine and Contra-Rotating Fan can be turned by a small motor with a dry cell. 2. Drag torque device is attached to apply drag instead of Blade Pitch Control, as I couldn't create the pitch change mechanism. 3. Engine (Gas-Generator) cutaway model is inside the Cowling, but it's not rotated by the motor. 4. Entire engine cowling with removable cover. Video: https://youtu.be/cq59D1QPtXE B. Assembly Manual (PDF format, 30 pages): The detailed assembly manual, including "Parts-List," "After printing treatment," and "Assembly procedure," is prepared based on "Standard Skill" (Filing, Drilling, Tapping, and painting). C. General Notes 1. Bearing Selection: Bearings are crucial for smooth rotation. This model uses open-type ball bearings due to low friction. ID x OD x W = ① 9 x17x4; ② 10x19x5; ③ 25x37x7; ④ 3x6x2.5 (every 2 ea.) 2. For M1.4 Screw: No tapping is needed. Drill with φ1.0 drill and then directly screw-in. 3. STL file name: "ws" of the last two digits means "With Support," a special designed feature. Download files include: - STL Files (61 items) - PDF(Zip) File: Assembly Manual - images: Assembly Photos Purchase Parts Information: - BRGs: See Assembly Manual - Aluminum Tubes: See Assembly Manual - Screws: Micro screws M1.4x3.5L - Approx. 30 ea, direct screw-in to a 1 mm dia hole (No nut) Screws M2 x ** - See Assembly Manual - Motor is optional Assembly Points: - Standard Skill (such as Drilling, Tapping, Filing, Tightening, Painting, and Gluing) is needed, along with perseverance. - Blending and finishing of gear teeth are crucial for smooth rotation. - Others: See Assembly Manual Total Net Print Time: Approx. 130HR - Estimated as the case of PLA, 0.4mm Nozzle, 0.2mm Layer Height, 40% infill, and no raft or support. [Update 2019.1.4] Mod. Rotors (HPC, IPC) added to STL and Manual as an option.