Cub style landing gear

thingiverse

A Cub-style landing gear I designed for an RC DIY bush plane I built, boasting a wingspan of 120 cm and a total weight of approximately 1 Kg. However, this landing gear can easily be adapted to fit planes that are both smaller and larger than mine. By choosing different lengths of carbon fiber tubes and rods, the size of the landing gear can be tailored to suit specific plane requirements. I have successfully tested my landing gear with several takeoffs, flights, landings, and taxiing maneuvers on a bumpy grass field, and it has held up remarkably well so far. Solid 4 mm carbon fiber rods are used to connect various 3D printed components. The telescoping parts are constructed from 1 mm carbon fiber rods housed within carbon fiber tubes with an inner diameter of 2 mm and an outer diameter of 4 mm. For the "shock absorbers" in the suspension, I utilized an old bicycle inner tube, cutting it into "rubber bands." Heavier planes will require additional rubber bands. All plastic parts are bonded to the carbon fiber components using CA glue, except for those that need to move freely. Wheel axles from Hobby King were used in this project, as seen here: https://hobbyking.com/en_us/steel-axles-d4-x-l57-mm-x-m5-5pc.html Apart from wheel axles, some additional screws are necessary. I employed small M2 screws and nuts to connect the telescoping suspension rods. The inner screws also serve as the inner mount for the rubber bands in the suspension. To assemble one landing gear, you will need to print: * 4x suspensionEndBracket2 * 2x suspensionEndBracket1 * 2x rubberSpringHolder * 2x lowerConnector * 1x crossSupport * 2x 90degConnector * 2x 60degConnector For mounting the landing gear to your airplane, you will require: * 2x holderType1 or 4x holderType2 The "angleSpacer" can be used to thread over the 1 mm carbon fiber rod in the suspension to adjust the angle of the landing gear when it is not compressed. This spacer can be scaled (only Z-axis) to fit perfectly, or if you manage to manufacture the carbon fiber tubes exactly the correct length, you won't need this spacer at all. I created these designs using Autodesk Inventor (student license). The Inventor files are included in the download. Update 2020-04-13: I added the STL-file for my 3D printed hubs that fit the "Trexler Balloon wheels," as seen in the images. My wheels have a diameter of approximately 100 mm.