PROPFAN ENGINE, FUTURE STUDY MODEL

myminifactory

To solve the oil crisis of the 1970s, research began on a new engine for passenger aircraft that would take advantage of the fuel economy of turboprop engines while increasing speeds to the same level as turbofan engines.They have been called various names such as PROPFAN, OPEN ROTOR, UNDUCTED FAN and ULTRA-HIGH BYPASS engine, but I think they need to be unified first.Among them, the following two models underwent flight tests in the 1980s, and achieved some success.　・GE36(GE+NASA)・・Turbine type, Contra rotating, pusher type　・578-DX (PW-Allison+NASA)・・ Planetary gear type, Contra rotating, pusher typeHowever, the research was discontinued due to the subsequent drop in oil prices and noise problems. 　On the other hand, Russia has a towed engine (D-27) that has been put into practical use.In 2017, ground tests of planetary gear, double-rotating, and pusher engines were conducted at SAFRAN.In 2021, CFM International announced its "RISE" program, which aims to make its first flight in 2025.Unlike the previous engine, it seems to have a unique configuration: puller type, 1-stage fan + 1-stage guide vane.As demands for a more sustainable world grow stronger, I believe it is necessary to develop engines that prioritize efficiency.Therefore, in the past I have produced models of turbine type and planetary gear type engines and pitch-changeable fan sections.Based on this, I thought it would be great if such a sustainable engine could be realized in the future, so I created my own new model teaching materials. A. Structures and functions that future engines should have【PROPFAN】　① Multiple blades (10 or more)　② Pitch changeable・・Thrust reverser can be eliminated　　　　　　Feather to Reverse (or Ground Fine)　　　　　　Front and rear rotors can be controlled separately　　　　　　Contra-rotating operation during cruising　③ Rotor lock (rear only)・・During takeoff and landing in noise restricted areas 【GEARBOX】　④ For prop fan control・・2 outputs planetary gear unit　⑤ For driving proper prop fan rotation speed・・Single output planetary gear unit 【ENGINE】　⑥ 2 spool engine...Sustainable aviation fuel use　　　　　　　　　　　 Appropriate rotation speed LP Turbine 【Built-in functions in this model】　(1) Rotation・・DC motor + gear system　(2) Pitch change・・Bevel gear + cam + push/pull shaft used (Angle not accurate)　(3) Rotation distribution control・・Brake attached to the front rotor shaft (Speed not stable)　(4) Blade lock・・Gear teeth and lever [Video] youtu.be/HrYDe0CVF2M B. Assembly Manual (PDF format, total 41 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;　-Metal Bearing (Ball) - 6800ZZ (10x19x5)x7, 6801ZZ(12x21x5)x2, 6804ZZ(20x32x7)x1, 6805ZZ(25x37x7)x2,6806ZZ(30x42x7)x2, 6807ZZ(35x47x7)x2, 689ZZ(9x17x5)x2, DDL-1370ZZ(7x13x4), DDL-520ZZW52(2x5x2.5), SMR63ZZ(3x6x2.5)x8　-Coil Spring (5x10x0.4) x2　　　　-Aluminum Pipe φ3, 4, 5, 7, 9　-Screws M1.4, M2 (+Nut), and M3 - Size can be changed by your experience. D. STL file　　STL files of this model are 97 items.　　"ws" of last 2 digits of file name means "With Support" special designed. E. Total Net Print Time: Approx. 178 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. Before "Down-Loading", please watch photos carefully and consider deeply.I wish you success!!.