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Details here: http://wiki.openpilot.org/display/Doc/CopterControl+case

ah! it was the "2836-11" in your original post that threw me ;) That looks like way too much prop for a 70g motor. eCalc list the max wattage at "100W for 20 seconds" for the RCTimer 2836-11. There's no mystery to this: the ability to dissipate heat is closely tied to the total mass of the...

Is Microdrone's gimbal always that bad? I certainly wouldn't put that footage up on a sales site! And considering the price of the Microdrones, it's close to laughable.

Do you have a link to data for that motor?

http://www.ecalc.ch/xcoptercalc_e.htm :) - pretty accurate

Markus (of eCalc.ch) has not put any facility in there for coaxial setups because there are too many variables to be able to calculate the result with any reasonable accuracy and little scientific test data to verify against. The net loss you will experience between a coax pair and the same two...

:) Certainly you are right that that you need to consider pitch on coax arrangements. The optimum setup is with a higher pitch prop on the bottom, but nevertheless they should both still be "low pitch" props. According to some boffins in the Power Systems forum on RCG, the difference should be...

Do you want these for a multirotor? I hope not - they are way too high on the pitch. A pitch/diameter ratio of 50% is about your maximum, i.e. 14" props should be maximum 7" pitch. Nevertheless, you really want less than that - like 14x4.7 or 14x4.

It does appear that the eCalc rating for that motor is wrong - the RCTimer site states 243W, so we'll assume that figure is correct. You can fudge this in eCalc by first select the motor from the list, then changing to "Custom" and entering the higher figure for "Limit(up to 20s). Remeber too to...

Hi Dan, You can't really play "what if" on batteries, motors, etc. unless you choose the "without Drive" option for the "xCopter Weight" and enter the figure for only your frame, landing gear, etc., i.e. exclude the motors, ESCs, batteries. Is that the way you're doing it? If not, that could be...

Soldering ;)

... we'll want pictures, of course ;)

PCB distribution boards are okay for small machines, but I'd be very cautious on a heavy-lifter. The only one I've seen that actually quotes its current capacity is the PhotoshipOne unit - and it's low! A heavy lifter can easily pull 200-300A at full throttle. That sort of current (even for a...

I seem to remember someone saying (perhaps in Boris's thread on his PH gimbal problems?) that you should leave them open - something to do with magnetism ;)

What I find most interesting is the gimbal design: direct drive on the pitch axis and pushrod linkage on the roll axis. Servos looks like Hitec 7990.

Sorry - what's "Fr." and "PDB"? I agree - this seems to be one of those "solutions looking for a problem". And twelve (12!) mounting points? That pretty much guarantees that any flex in the fuselage will crack the PCB - so don't even land heavily, let alone crash!

If you have a multimeter you can measure the resistance range of the existing pot. Remember, too, that apart from facilitating multiple turns, the other reason to replace the original pot is quality: a high-spec wire-wound multiturn pot will give the servo's feedback circuitry a cleaner, more...

Great work! There's some very innovative thinking in this design - and it should be a very effective AP machine. I'd look at launching it with a CopterControl board (if you can get one) - that drops $1000 off the price straight away. The Pro/INS will definitely be MUCH cheaper than a DJI, but...

Not a good idea, Gunter! Those 13" props are just too much for those little 70g motors. Swap to 10" or 11" and fly with a single battery :)

I'm not at all familiar with RCTimer - I just found that in the eCalc list: it seems to be the motor that Gunter has now (or the equivalent thereof). The Tiger motors do look interesting (the whole range) - and they look pretty cool as well :)