Trying to make something a little more compact than my last design-still haven't had that one in the air-snow and cold!! Anyway I have a 550mm octo with 240mm plates turning 12" props. Working on getting the pixhawk setup now. Bought a 3d printer so I printed all y won motor spacers and tube clamps. The main housing clamps are 5 degree up angle and notched for the arms. mounting holes on bottom for 60mm wide tubes or 62mm gimbal mount
Those are DJI 2212 motors pushing the 12-38 props. ecalc shows no problem and I put both the red and black motors on my test scan to check heat problem. Full throtle for 4 minutes got the motors up to 120 deg. with both 11x4.7 and 12x3.8 with almost identical watt and thrust readouts. I don't figure these will run at full throttle very often. ecalc puts it at about 35 mph and im looking for stable video.
The design is like a Chinook with about 50% overlap. It would run with multiple motors out. This one can handle up to 13" props and the big one up to 20"
AUW without battery is 1575g
The motor mount is also notched and I am using my custom CF motor mounts that are 100% separated from the arms with goromets. They can be adjusted for tension and I just flew them on my 680 with a DYS gimble and Canon dslr and the picture is very stable.
I have motors and folding arms for making a larger version 300mm body, using 3508-380 motors and 17"+18" props to test. mounting holes for 60 and 155mm mounting tubes, 62mm and 100mm gimble mounts. I have the CF plate to router the big octo
I also designed and printed a set of Hex mounts like the Tarot 680 but with 5 degree of up angle on all the arms that I will be putting together next. I have the plates designed like the octo but 280mm instead of 300(same design as the ones pictured below
Any input welcome. Weather starting to get a little better and hhopefully in the next month I will be flying all this stuff I have been designing.