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HelicopterMain Discussion › Motor temps how hot is too hot?
03-14-2015 02:13 AM  3 years agoPost 1
emederos

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Miami, Fl Dade

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I fly about 8 minutes and the motor isn't hot to the tough but after about 5-7 seconds it becomes pretty hoy. I know motors are made to operate at about 150 degrees or so but i want to know if I'm in a good range. What is a good rule of thumb to stick too?

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03-14-2015 04:13 AM  3 years agoPost 2
McKrackin

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Lucasville,Ohio

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If you can hold your finger on it for three seconds without getting burned,you're good

I literally never use the word literally right.

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03-14-2015 04:15 AM  3 years agoPost 3
McKrackin

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Lucasville,Ohio

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I had a Scorpion 40mm series that would hit close to 200.
I think it was because it was a big motor on a little 6S pack.

I literally never use the word literally right.

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03-14-2015 04:18 AM  3 years agoPost 4
Motorg525

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Long Island

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If I'm not mistaken its 240 degrees

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03-14-2015 07:20 AM  3 years agoPost 5
JEEPWORLD2002/2

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Blue Bell, Pa

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Are we taking about a nitro engine or electric motor ??
200 on el motor max some magnets will start to loose their properties at higher temps
220-230 on nitro is kinda max keep in mind if u use lower % nitro temp will be higher

Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP

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03-14-2015 01:50 PM  3 years agoPost 6
Dan Minick

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Columbus, WI

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and the motor
I know motors

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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03-14-2015 02:22 PM  3 years agoPost 7
McKrackin

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Lucasville,Ohio

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Very useful dyecocker. Way to go.

I literally never use the word literally right.

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03-14-2015 02:42 PM  3 years agoPost 8
ICUR1-2

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Ottawa, Ontario

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^ I blame cabin fever

spending time, paying attention

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03-14-2015 03:52 PM  3 years agoPost 9
Dan Minick

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Columbus, WI

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Apparently there was some confusion in the thread. Motor means electric. Engine means internal combustion. Is that better?

Scorpion motors run hot. 200 is not all that abnormal, especially on a hot day. That is why I no longer run them. If you can hold your finger on it for 7 seconds you have nothing to worry about.

Cabin fever? Nah, I have been flying all winter

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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03-14-2015 09:20 PM  3 years agoPost 10
McKrackin

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Lucasville,Ohio

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There ya go

Tougher than me if you fly all Winter

I literally never use the word literally right.

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03-15-2015 12:30 AM  3 years agoPost 11
emederos

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Miami, Fl Dade

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how can timing help with temps? my esc has a PWN and a timing setting i can change, now the timing is at 15 and the PWM is at 16mhz...

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03-15-2015 12:32 AM  3 years agoPost 12
Dan Minick

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Columbus, WI

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Typically the lower the timing the cooler you run with sacrifice of a bit of power. This may not be true in all cases.

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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03-19-2015 07:15 PM  3 years agoPost 13
emederos

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Miami, Fl Dade

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After about 8 min its almost hot to the touch. Im at 1600kv 12t pinion on 85% IU, should i raise to 90% ?

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03-19-2015 07:25 PM  3 years agoPost 14
HeimD

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the great southwest

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Typically the lower the timing the cooler you run with sacrifice of a bit of power. This may not be true in all cases.
Typically you just move the heat from the ESC to the motor with lower timing. I'd prefer it that way since the motor doesn't have a single sensitive electronic component in it. Generally cheaper to replace than an ESC, too.

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03-19-2015 09:08 PM  3 years agoPost 15
emederos

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Miami, Fl Dade

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Its a scale trex 500e in a fuselage , 1600kv align motor, 12t pinion, 162t main, 100amp esc hobbywing, flying PC is at 50,50,50,75,100 and TC 85% across. Hiw can i get temps dowm. Mechanically set -3,0,+10

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03-20-2015 01:22 AM  3 years agoPost 16
JEEPWORLD2002/2

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Blue Bell, Pa

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Do you stay in normal or idel up ?? If normal u need to add head speed. The esc is switching to much with u having it set at 50%.

dropping a tooth on the pinion and increasing you throttle curve to be 75-80% staring across maybe 65% at nor mid point then keep you t curve for iu1 85% straight , then 90% for iu2

Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP

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03-20-2015 04:38 PM  3 years agoPost 17
Mitchilito

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Morehead City, NC USA

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The wives tale is that the new neo magnets are VERY sensitive to overheating. Less magnetism = less power.

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03-20-2015 04:46 PM  3 years agoPost 18
turboomni

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East of the Equator

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It sounds like you are doing the equivalent of lugging an engine. I would first try a smaller pinion and up the throttle %. I agree with Jeepworld. How are you measuring the temp?
Another option is going to a lower KV motor. It would be great to know what head speed works best for you and then adjust the pinion and or motor so the throttle position isn't so low to get that head speed. Lugging or over gearing tends to generate heat and low throttle % adds to the problem.. Setup correctly your flight times could very well improve as everything electrical is happier with less load.

Setup is everything, All my heli's can fly far better than I can pilot them

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03-21-2015 01:21 AM  3 years agoPost 19
icanfly

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ontario

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sounds like your getting a heat soak effect if you feel it too hot after it's shut down.

In the real world ic, elecrtic, diesel whatever, nothing is going to last long over 180f.

Either your gearing is too high on the pinion, voltage is too low for a low rpm setting on an old style non FREEWHEELING esc, timing and pwm in the esc are off, c rating in the lipo too low, and connectors could be poorly soldered and /or there's a loose solder joint somewhere vital. All factors that will cause undue temps. Throttle curves should be at 100% or near to get a cool running motor with a non freewheeling esc, those that cycle off the extra voltage causing heat.

In all my helis I adjust timing and pwm to get the lowest temps, my 300 case in point though not a huge heli had a motor that felt like it was burning up last year, and now has a properly tuned 3500kva that shocked me after a flight earlier today. The motor was room temps and the battery was luke warm not hot whatsoever. This is when you will have everything right. I'll be experimenting with 4s and 6s shortly as I bought 2 nanotech 1.0 4s Turnigy's today.

Your straining something (the short answer)

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03-21-2015 05:36 PM  3 years agoPost 20
emederos

rrApprentice

Miami, Fl Dade

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I been wondering and messing around with the throttle curves and pitch curves trying to find the right headspeed but WOW i cannot believe after all this time my BL500L align motor just doesnt have the balls to pull my scale 500e through the air. After extensive test flting and even cutting my flight times in half still the motor is almost hot to the touch and i believe i know why. Im flying a scale 500e fuselage 162t main gear with 12t pinion on my 500 esp and 6s 5000mah pack and its just overwhelming this motor. Whatever i do with pitch or throttle adjustments the motor temps stay almost hot to the touch. Here are the specs of my current motor and below are the specs of the motor i want to upgrade to. Being the same kv motor but being able to output more than double the power and amps should help with temps i assume....correct me if im wrong...

Align 500L

Input voltageC11.1V-22.2V 3-6cell Li-PoMax continuous current: 4S 45A/55A(30sec)6S 35A/45A(30sec)Max output power:650W/800W(30sec)KV value:1600KVDimension: spindle 5x36x61.1mmWeight: 200g (prox.)

align 500mx

Input voltageC11.1V-25.2V 3-6cell Li-Po
●Max continuous current:75A/110A(5sec)
●Max output power:1600W/2300W(5sec)
●KV value:1600KV
●Dimension: spindle Φ5xΦ40.9x46.5mm
●Weight: 197g (prox.)

Will Switching to this 500mx motor help with motor temps due to extra battery weight , fuselage weight and unsufficient cooling due to being enclosed in fuselage?

thanks in advance

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HelicopterMain Discussion › Motor temps how hot is too hot?
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