Hi, just been testing my Y6 with it's new 6000mah 4S pack and noticed the motors are getting hot. This is affecting the bottom motors more where if you touch them on the base, non rotating part, they are too hot to touch for more than a few seconds. The rest of the motor is hot but can be held without issue.
To check I did another flight with a 3S 4400mah setup and the motors were again getting hot, not as hot but the flight time was 5 mins vs 13 mins.
It's also worth noting with the 4S setup the ESCs were also getting hot, again after a 13 min test flight.
The flight itself basically consisted of a 13 minute hover in loiter mode, I was testing battery times, and consumed 5000mah. The weather for the UK was hot, 25 deg C. The Y6 is a new 2014 B version weighing 1900 grams or so, std config plus 600 gram pack, with std 10 inch props and 850 blue motors.
And finally to the question, is this normal of does something sound wrong?
The only thing I can think I haven't done is balance the props, guide for this would be handy, but I have no vibration issues looking at the data log.
Replies
I'm interested in some plates as well! I'd prefer the 6-sided Y6B mounting plates to the circular ones, but either one works, I suppose.
Yes, I have 9" Tri blades, running 10" APC on the top, the higher pitch tri prop on the bottom seems to function fine, the motor temp seems to be within norms, no hotter than the top, but not that (10-20%) much hotter than ambient...
Interesting. I assume the 10" APC are 4.7 SFP. What pitch and type are the tri blades? Do you have a link?
yes, on the APC, 9x4.5 tri blades
I went to APC's website and couldn't find 3 blade 9x4.5 props. Where did you get them?
http://www.quadrysteria.com/store/c14/9%22_Propellers.html
Oh ok. I was thinking APC brand, not style. Thanks.
Interesting - the data sheet (presumably from jDrones) says use a 9x6 on the 880Kv if you're using 4S batteries, whereas 3DR recommends 12x4.7 or 11x4.7.
The data sheet also says:
Our motors providing best performance with the recommended propeller size. If you consider to change the propeller size be aware that motor can overheat and damaged.
No kidding! 12" props on the top seem fine, but our collective experience here seems to agree with that point from the data sheet when it comes to bottom motors.
Picking up my 10x5.5 MRs tonight, and I'll try to get out for a test this weekend. I'm hoping they cool down the bottom motors.
With APC 12x4.5 MRP on top and 10x5.5 MR on bottom, the motor casing on the bottom is no longer any hotter than the top after a 5-minute flight.
The base of the motor, where the two screws hold it to the arm, is still quite hot to the touch, but this is an improvement. If the fiberglass plate between that motor and the aluminum arm was replaced with a better conductor of heat I bet that would improve things.
Can anyone recommend such a part? Unfortunately I don't have the hardware to create one.
@Alberto,
On #3, where did the prop recommendation of 9x6 come from? Is that top and bottom?
Also, FWIW, I got my kit from a 3DR redistributor with 880Kv motors and 30A ESCs. I've been flying for a couple months. The ESCs are never hot to the touch.
The max current draw I've seen is 90A for the whole copter at full throttle on a 4S battery. This is probably because I'm using the 3DR Power Module, which has a max draw of 90A:
http://copter.ardupilot.com/wiki/common-measuring-battery-voltage-a...
Seems like the odds of exceeding 30A on any particular ESC is low if all 6 ESCs are sharing 90A. Someone more experienced is very welcome to correct me if I'm wrong. :)
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