Jet Engine, Geared Turbofan (GTF)

cults3d

The latest jet engine for passenger planes boasts an increasingly larger Bypass Ratio to significantly enhance its performance. To meet this need, the Geared Turbofan (GTF) was developed, with a 3D model created to explain its system. Key features of the design include: A compact "Fan Drive Gear System" with a 3-to-1 reduction ratio is showcased in red in photos. Each spool's rotation is facilitated by ball bearing and dummy bearing methods. All stator vanes are omitted to avoid vane-blade rubbing, and each rotor, except for the Low Pressure Turbine (LPT), features support for single-piece printing. The blade angle aligns with the spool rotational direction when viewed from the rear. The HP Spool rotates clockwise, while the LP Spool and Fan rotate counterclockwise and clockwise respectively. Additionally, certain parts that are difficult to print without support have been provided as STL files with support marked by "ws" at the end of their file names. A parts breakdown list and assembly order guide have also been prepared for ease of understanding. The downloadable files include: STL Files Parts Breakdown images for assembly aid An Excel File containing a Parts List Purchase the necessary components, including: Bearings (Can be used in place of BRGs; see Parts List) DDL-1370ZZ (7 x 13 x 4) - 2ea for LP-Spool 689ZZ (9 x 17 x 5) - 3ea for HP-Spool and Fan 675ZZ (5 x 8 x 2.5) - 2ea for Fan Drive Gear Train Aluminum Tubes; see Parts List Screws: Micro screws M1.4x3L - Approximately 60ea for direct screw-in to 1 mm dia hole (no nut) Screws M2 x 6L - 4ea, see Parts List Screws M3 x 8L and Washer - 1ea, see Parts List Assembly Points: A standard skill level, such as drilling, tapping, filing, tightening, painting, and gluing, is required along with perseverance. For gears, deburring is crucial for smooth rotation. When removing support from HPC and LPC rotors, take care to avoid damage. Total Net Print Time: Approximately 31HR (Estimated in case of PLA, 0.4mm Nozzle, 0.2mm Layer Height, 40% infill, no raft, and no support) Note: Adjust print parameters according to your experience when printing. Update: Optional Fan; https://cults3d.com/en/3d-model/tool/jet-engine-geared-turbofan-gtf-optional-fan - 2018.2.16 Modified Rotor; https://cults3d.com/en/3d-model/tool/jet-engine-geared-turbofan-gtf-modified-parts - 2018.3.21 Update 2018.07.12: Revised Description only. Update: 2019.09.01 FDG Carrier Parts were modified to improve gear teeth mesh. STL files changed as follows: Index 11 FDG-Frt-Panel201 → FDG-Frt-Panel301 Index 15 FDG-Rr-Panel201 → FDG-Rr-Panel301 Image and Photo are added.