I started a blog post some time back for a pre-production prototype we have been working on called the Quattor-bit. We have made a bit of changes after some suggestions, so we deleted the old blog and decided to start fresh with a new one. We originally wanted to call it the Quattro-bit, but thought we might run into copyright issues ( Victorinox Quattrobit knife). Well, it's almost done. Everything seems to be working as hoped.
We plan on selling the frame for around $300 with motors and ESCs'. The arms are made of thick pulltruded carbon tubes. The body is molded carbon fabric, but we also will be offering a fiberglass version at a lower unit cost. We are trying to use as little metal as possible, screws etc. The motor mounts are 3mm carbon panel, virtually indestructable. The mounts are fastened to the removable arms by wrapping 15 feet of carbon thread soaked in high grade epoxy resin. The body is large enough to hold a 11.1V 2600mah battery, and of course an APM. It will handle motors ranging from 22mm to 28mm can diameter. Gone are the Helicopter style landing gear. This size is more suited for small fpv gear, which we will demonstrate with later updates. We are still fabricating some of the parts, but this is what it will basically look like. Welcome any thoughts, suggestions, or questions. Couple of more videos on Youtube, just type quattro-bit in the search query.