Propfan Engine, Pusher Type

cults3d

Propfan Engine, Open Rotor Engine, and Ultra High Bypass Engine was developed as Advanced Turboprop Engine to achieve high flying speed while consuming the same amount of fuel as a Turboprop Engine. There are several types of engines, including: Puller (Retract) type - Contra-Rotating Propeller (Fan) with gearbox is located at the front like a common turboprop. Pusher (Un-Ducted Fan) type - Contra-Rotating Fan without gearbox is located at the rear. However, development of these types of engines seems to have been interrupted due to noise problems and other issues, except for one company in France. The contra-rotating power turbine mechanism with sweep-back angle fan blades of Pusher Type has caught my attention very much. Then I tried to create a desktop model, but it was difficult to achieve smooth contra-rotation. However, my target model could be finally made through several trial and error processes. A key feature of this model is: 1. Contra-Rotating Fan (PT: Power Turbine) can be turned by a home-type vacuum cleaner. 2. Engine (Gas-Generator) cutaway model is inside the cowling, but it's not rotated by air. 3. Entire engine cowling with removable cover. Video: https://youtu.be/2Hu1QvJ5J9o B. Assembly Manual (PDF format, total 19 pages) The detailed assembly manual including "Parts-List", "After printing treatment" and "Assembly procedure" are prepared based on Standard Skill (Filing, Drilling, Tapping and painting). Important adjustments of axial clearance are described in the manual as marked ●. C. General Notes 1. Bearing Selection Bearings are very important parts to achieve smooth rotation. This model is designed to use open-type ball bearings due to low friction. ID x OD x W = ① 7 x13 x 3, ② 9x17x4, ③ 17x30x7 (2pcs) CAUTION: Shield-type ball bearing may cause rubbing problems. 2. For M1.4 Screw No need for tapping. Drill with φ1.0 drill and then screw directly in. 3. STL file name "ws" of last two digits means "With Support" special designed. Download files include: - STL Files (48 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 1 mm dia hole (No nut) Screws M2 x ** - See Assembly Manual Assembly Points - Standard Skill (such as Drilling, Tapping, Filing, Tightening, Painting and Gluing etc) is needed and perseverance too. - Others: See Assembly Manual Total Net Print Time: Approx. 80HR (Estimated as case of PLA, 0.4mm Nozzle, 0.2mm Layer Height, 40% infill and No raft and support) Note: When actual printing, each parameter may be adjusted by your experience.