Whaaaaaa?? Counterclockwise motors running 20 degree's C hotter than Clockwise??

SMP

SMP

Member
Doing up and downs with the AD6 lifting 5D2 and T3i and the clounter clockwise motors are all roughly 20 degree's celcius hotter than the clockwise motors after the flight. Props, motors and airframe have been micro balanced. Props are APC 13x6.5s

No clue on this one... any help greatly appreciated!!!

THANKS!!
 

Av8Chuck

Av8Chuck

Member
What kind of motors?

Chances are the ventilation on the bell housing on the motors your using are designed to turn clockwise. Being hotter is not that big a deal as long as none of the motors are too hot depending on your payload.
 

Breezemont

Breezemont

Member
If one motor in that group is struggling for whatever reason, the other two will have to work harder.
Bad bearing, loose prop, bad esc or connection can often be the culprit.
It can also mean a motor alignment issue - the motors are fighting a yaw.
 



SMP

SMP

Member
AXI 2814's

Breezemont - If one motor in that group is struggling for whatever reason, the other two will have to work harder.
(Makes sense, will have to dbl check but having balanced all motors and checked with laser pointer and were rock solid smooth across the board)
Bad bearing, loose prop, bad esc or connection can often be the culprit.
(Hmm, Don't think its a bearing based on feel and laser but ESC... that could be... Gonna have to figure out how to troubleshoot ESC's looks like)
It can also mean a motor alignment issue - the motors are fighting a yaw.
(Motor Alignment??? ACK! WTH is a motor alignment issue? Motors not screwed into arm correctly?? Sorry mate, don't mean to be thick) :)

Gump - These motors don't somehow have mechanical timing advance built into them, do they?
(uhhhhhhhhhhhhhhhhhhhhhhhhhhhh Dunno) ;)


Thx for all the help guys!!!!
 

R

RotorFilms

Member
Hi All,

When you check your motor temps where do you feel on the motor? At point 1 in the picture or point 2? I always feel at point 2 and for some reason my motors are always running hot. I've tried different size props, even approached AXI and they say the 880gram payload I have per motor should not be a problem at all. Just interested to find out where you all check for motor temps.

Cheers,

Andre

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snurre

snurre

Member
By motor alignment we refer to any angular offset between the motor shaft and the copter z-axis (straight up). If one or several motors are offset it will inevitabely introduce an uneven power distribution since the yaw composant resulting from the offset thrust vectors (misaligned motors) must be compensated by differentiated power on cw/ccw motor sets.
/Tomas
SMP said:
AXI 2814's

...
It can also mean a motor alignment issue - the motors are fighting a yaw.
(Motor Alignment??? ACK! WTH is a motor alignment issue? Motors not screwed into arm correctly?? Sorry mate, don't mean to be thick) :)

Gump - These motors don't somehow have mechanical timing advance built into them, do they?
(uhhhhhhhhhhhhhhhhhhhhhhhhhhhh Dunno) ;)


Thx for all the help guys!!!!
Click to expand...
 

M

Michael64

Member
Iam running the AXI's 2814's on my 12.5 pound hexa and with the 13x6.5 and 13x4.7 APC props the motor temps on the CCW is about 140F while the CW motors are 120F. I put a set of Graupner 11x5 same amp draw 59 amps but the motors went to 110F all around and ESCs were barely above the ambient temp which was 80F. The ESC's and the bigger props the ESCs was at 108F after a 8 minute flight. I forgot I was using 2 5300 4S batteries they 65-120C rating .

Michael64
 

SMP

SMP

Member
Ahhh, now that is interesting Micheal... Sounds like a side effect of being over-propped. Will pop the XOARs back on and see if it goes away.

Thanks all for clarifying motor alignment!!! Will dbl check as i replace props above :)

AND...

Rotorfilms - I grab #2 with my hands as well as aim a laser type heat gun at #2 and again inside at the copper coils.
 

R

RotorFilms

Member
SMP said:
AND...

Rotorfilms - I grab #2 with my hands as well as aim a laser type heat gun at #2 and again inside at the copper coils.
Click to expand...

SMP what kind of temperatures are you getting? What size Xoars are you going to fit? What is the weight of your platform? Please keep us up to date with your findings.

Regards,

Andre
 

SMP

SMP

Member
Hi Andre,

Couple of updates.

Temperatures on the clockwise are 25-30C and CCW 45-50C. Fixed some small motor alignment issues and temps evened up significantly. Looks like it was principally a motor alignment issue.

Tried out some props. Base props have been APC 13x6.5 This copter has been VERY VERY sensitive to balance. Spinning the larger props helped stop the shakes if the balance wasn't perfect and by perfect I mean, taking off the gimbal and balancing the hex from a single point plumb line, balancing the gimbal with all components and then balancing the camera in tray removing tilt belts and roll servo (AV200/360) and then re-balancing the gimbal with the camera and then assembling it all back together again. It could probably do with a bit less gain but I'm heavy (w the 5D2/28mmIS) and it's often windy here (15-20mph). Any imperfection it shakes and then the Skyline feeds more shake into it creating small to medium rapid shakes. Balance balance balance

So yesterday, missed the balance by a fraction. Wind was 16mph avg.
Base props APC 13x6.5 created very small buzzy type shakes along a single axis when panning. Tried the 12x4.5 XOAR Beechwood again, rapid shakes all axis - unflyable. (No clue what the issue is with these, all have balanced tips and hubs, but was thinking that perhaps the extra prop speed and the gains...) Then we put on the XOAR 12x4.5 Carbon Fiber. WOW!!!! NO vibration. Sucked up the minor imbalance. Sounded wicked cool. Flew very hooked up. Motor temps by hand were barely warm. Consumption is running 591mah per minute giving me similar flight times as the 13's. (Flying an Exotic6000mah)

So...are the XOAR carbons worth a 120 bucks a pair. Oh yes. Do I wish their 40 bucks a pair beechwoods would play ball to compare?? yup. Carbons for the win at the moment. Will be trying these against the APC 12x5 SloFlyer next time out.
 

R

RotorFilms

Member
Hi SMP,

Thank you very much for the update. I'm using apc slow fly props so I should be ok seems like I just need to check all my alignment and balancing again. The cinestar is not the easiest to take apart and put back together accurately unless I'm missing something something. Anybody have any pointers?

Well let you know how it goes after balancing and aligning.

Regards,

Andre
 

R

RotorFilms

Member
Hi SMP,

Thank you very much for the update. I'm using apc slow fly props so I should be ok seems like I just need to check all my alignment and balancing again. The cinestar is not the easiest to take apart and put back together accurately unless I'm missing something something. Anybody have any pointers?

Well let you know how it goes after balancing and aligning.

Regards,

Andre
 

R

RotorFilms

Member
Hi SMP,

Thank you very much for the update. I'm using apc slow fly props so I should be ok seems like I just need to check all my alignment and balancing again. The cinestar is not the easiest to take apart and put back together accurately unless I'm missing something something. Anybody have any pointers?

Well let you know how it goes after balancing and aligning.

Regards,

Andre
 

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