Mocking up the 250 project last night, might take a different approach
0Crossposted on DroneBuilder.Org
Sorry for jumping threads, but the original "Lets build something" thread has grown to an unusable size.
I was mocking up the 250 chassis last night and was struggling to find a good place to put the full-size 3s 2700mAh battery. I think the top shelf is too far above COG for that much weight.
Then I started to get creative. Why not turn things upside down?
I was thinking I can build a very simple battery cage out of Kydex and mount it to the bottom. I can even integrate some landing skids into the battery cage design. This also gives me more rotor clearance if I want to experiment with larger rotors, and keeps the center deck available for FC, receiver, VTX and camera.
Can anyone think of a reason this won't work?
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Looks like a neat idea. The kydex cage sounds interesting, too.
While you're having fun with it, except for losing the ability to run larger props, it would be neat to try flipping the arms and putting the props on "upside down" so they act as pushers. Just make sure your motor threading/rotation is still the right direction. Then you can just have an upside down mini quad and tell everyone you're flying inverted :)
@djslack Mind...
...blown.
@djslack I was thinking that same thing until the mention of trying other prop sizes was brought up.
btw where's your landing gear? I think that's the other reason for having the props on the other side of those arms :P
@DJMajickMan My thought was to build a battery cage from kydex and incorporate the landing gear into the cage.
@ruouttaurmind So are all of your components going to be installed upside down in this? It looks like the top plate, now your bottom plate, doesn't have the wholes drilled for mounting your PDB, FC, etc.
He could suspend them upside down with standoffs from the now top plate.
@djslack Ringa-ding, give that man a cigar! @DJMajickMan Since the PDB would now be on the... uh... bottom of the top shelf? Anyway, PDB would be above, so mounting the FC in the specified location on the upper deck would be ideal. Of course this depends on OpenPilot's ability to invert FC inputs. If it won't support that, well, I guess I'm on to Plan B. Maybe a different firmware, maybe a different mounting (ie: drilling holes in the bottom deck), maybe I scrub the whole idea and go conventional?
@ruouttaurmind couldn't you just mount the fc with the top facing the plate it's hanging from so as not to have to worry about inverting anything controlwise?
That said i believe you do have the ability to tell the fc how it's oriented, depending on the firmware.
@djslack Good suggestion. The problem is the CC3D I received is a top pin board. If it was a side pin board, you are exactly on the mark. I'd just mount it in the proper orientation, but with it's head facing the top deck rather than it's butt mounted on the bottom deck.
@ruouttaurmind ahhh... You can tell i haven't taken mine out of the antistatic bag yet :)