ZMR250-X LOS-Trainer

thingiverse

This Quadcopter is specifically designed for one purpose: Training Loss of Signal (LOS) skills using a high-performance multicopter in the 250-class category. Warning: The mid-plate, which is designated as zmr250-x2-mid.stl, requires a carbon fiber board to prevent structural weaknesses. This quad suffers from the same issues as other similar designs: The printed parts are not robust enough and will likely crack due to vibrations. After some time, the part will resemble shattered security glass with numerous cracks. To assemble this quadcopter, you'll need three spare arms for the ZMR 250, which can be obtained at a cost of around $10 on eBay. You'll also require four small zipties that secure the battery holder. A 20mm Velcro strap is recommended for securing the battery to prevent damage in the event of a hard crash. The zip-ties pass through all three plates, providing additional stability and security. If you're using a CC3D Atom flight controller, refer to http://www.thingiverse.com/thing:1684887 for the necessary green parts on the exploded view. This design allows you to stack your PDB, CC3D, and RX modules onto the mid-plate, with the four screws easily accessible once everything is assembled. You can also use other flight controllers like F3 or F4 that support 30.5x30.5mm mounting. The arms are secured using 12mm or 16mm M3-screws and locknuts; a total of 16 pieces are required. For the PDB and FC, you'll need to use a 30.5x30.5mm schema with M3-screws. To complete the build, you'll need four 10mm-M3 screws for the first Level Nylon-Spacer or four 30mm-M3 screws if you prefer to use my CC3D-stack design. This quadcopter is compatible with both 5-inch and 6-inch propellers, as well as small batteries ranging from 1000mAh to 2200mAh. I recommend using http://www.thingiverse.com/thing:1905550 for a motor protector. The all-up weight (AUW) of my build is approximately 417 grams with a 3S 1300mAh battery, and 448 grams with a 4S 1300mAh battery.