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Hello everyone, I'm pleased to present my latest personal creation: the CFM Group's RISE engine! This is a turboprop engine program known as Open Fan, i.e. without a nacelle enclosing the main fan. This kind of prototype, still at the demonstrator stage, should equip future aircraft by 2025-2030, if promises of reduced fuel consumption are kept! (https://www.cfmaeroengines.com/wp-content/uploads/2021/07/CFM_RISE_Whitepaper_Media.pdf) Like my version of the LEAP 1C already built in 2021 (https://www.flickr.com/photos/147164115@N07/albums/72157718957968196/with/51653430599/), I wanted to propose a standing model version once again with functional and motorized elements. I started the design at the end of 2023 and spread it out over 7 months. The final model is made up of around 1,300 parts, measuring around 20cm in diameter and 30cm in length. The big technical challenge lay in the mechanism for varying the incidence of the main rotating and fixed blades in a single movement, using a lever concealed in the base of the support! Let's see the photos: Technically speaking, to fully understand the concept, we need to distinguish between the "rotating" front fan blades and the "fixed" rear blades. A central mobile made up of 2 cradles is guided in translation by a linkage system. In transit, this mobile tilts all the eccentrically-mounted blades. The trick thing about this mechanism is that, from a single translation movement of the mobile, the front blades turn anti-clockwise, while the rear ones turn clockwise. You'll see, it's easier to understand on video! Of course, the entire mechanism operates when the motor is rotating. In addition to the technical challenge of packing this mechanism into a small footprint, I didn't neglect the aesthetic aspect of the motor to make it recognizable. Some will notice the painted parts on the blades and the nose. For the cylindrical part, which is always tricky to render in Lego, the motor is made up of 1 10-sided barrel using this assembly technique: https: //brick.camp/en/tech/clip-handle-swivel-decagon. In the compressor section, the rotating skirt is also inverted to fit under the conical cowling. Thank you for your reading, I hope you enjoyed it ! More photos available in HD at this link: https: //www.flickr.com/photos/147164115@N07/albums/72177720315475122 Paid instructions are available on Rebrickable: https: //rebrickable.com/mocs/MOC-180038/Levihathan/cfm-rise-engine/#details If you have any comments or questions, please do not hesitate :) @+
