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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Why is my motor coming down hot?
11-12-2012 12:44 AM  7 years ago
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Rotormaster

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Australia

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Why is my motor coming down hot?
Please watch this video and tell me what is wrong with my setup.

Watch at YouTube

I know the first thing people are going to say is "gears too tight", so I'll spare you the trouble. As you can see in the video, there is more then sufficient backlash between the main gear and the motor pinion, as well as the front TT gears.

With that aside, it is a bone stock X5, running on a 4000 mAh 40C pack. The ESC timing is set to 15º. PWM I believe is ay 8KHz, and pitch is at 12º +- for collective and 11º for cyclic.

After only 4 minutes 20 seconds of soft flying, the battery comes down cool, the ESC cool, but the motor is hot (sorry I don't have a temp gun). If I do a more normal flight (still quite soft) the battery comes down warm, the ESC warm, but the motor is nearly molten metal. I can't even hold my hand on it for barely 5 seconds??
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11-12-2012 12:52 AM  7 years ago
Stephen Born

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USA

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I once had a Scorpion 330KV motor on one of my helis. Flight was roughly 9 minutes. Scorpion motor was extremely hot. I swapped the motor with an Xera. I can fly for 9 minutes and its not even warm.

The difference is night and day. There is probably nothing wrong with your set-up.

It's a Scorpion, and they just run hot. Xera run extremely cool. Nature of the beast.
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11-12-2012 01:03 AM  7 years ago
Rotormaster

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Australia

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Not this hot, I don't think so.

I have a -6 on my 450 and it never comes down this hot.

I could successfully fry an egg on top of top of the motor. I think it is quite possible that I could get over over 100º
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11-12-2012 01:13 AM  7 years ago
seefest

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South Dartmouth, Ma.

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Scorpion motor
If you can't touch it, its alot hotter than 100 degreesF.
My Scorpion on my X5 comes down after a 5.5 minute flight and its between 90 and 100 degreesF. This is flying big air sport and mild 3D. I've heard of some Scorpion motors coming down at between 130-140 degrees though.
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11-12-2012 01:26 AM  7 years ago
Rotormaster

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Australia

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Fahrenheit?? We're in the 21st century! (J/K mate!)

I meant 100ºC.

Keep in mind, though, I am not flying hard here.
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11-12-2012 01:53 AM  7 years ago
SkySurfer

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usa

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Whats your gear ratio? If its too high then your motor will get very hot.
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11-12-2012 02:13 AM  7 years ago
mr dan

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Stockton Calif

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Why do you have the timing so high? 15* can you run it lower?"R.I.P Roman" Citizen 0094 in the Nation
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11-12-2012 03:56 AM  7 years ago
Volcano

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chicago

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hand on it for 5 seconds sounds like its ok. I think the motor hot is better than esc or batts hot.
harbor freight has cheap and accurate ir temp guns.
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11-12-2012 04:04 AM  7 years ago
helidevil

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Brunswick, ME

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i have the limited edition motor for my 700e, some flights its just warm and some flights it comes down searing hot. depends on how hard and constantly i push it. +1 for scorpions running hot
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11-12-2012 04:18 AM  7 years ago
Volcano

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chicago

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different esc's require different timing, even on the same motor. On a hobbywing 15 is the default and I think it may be appropriate. On my goblin I was told to turn teh timing down on my hobbywing because my motor has "delta winding" I duno what it meant but I turned it down.
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11-12-2012 07:00 AM  7 years ago
Rotormaster

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Australia

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Why do you have the timing so high?
Because that is the optimal setting for the Hobby wing ESC...
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11-12-2012 07:08 AM  7 years ago
Rotormaster

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Australia

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By the way, I forgot to mention that it isn't making that much power. It has enough power to do pretty much everything, but it does bog down rather easily, and that's even with my low pitch range.

I thought the X5 was supposed to be a power house?
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11-12-2012 09:32 AM  7 years ago
95nostalgia

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US of A

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Scorp Motor Hot
Scorp sez anything <80C is OK. I have mine with Boca bearing and saw a small decrease in temp. Typically 9-10min at 111F measured top of shaft immed after touchdown. Have been up to 118F in HOT Texas summer.

Scorps run hot.
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11-12-2012 09:41 AM  7 years ago
3dgimble

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Rochester

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All Scorpions run hot in my experience, you need to stock up on good bearing
oil to oil the bearings ever so often and keep stock of new motor bearings and shafts if you fly 3D.
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11-12-2012 10:17 AM  7 years ago
Propwash3D

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ohio great lakes

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scorpion 4525 and 4530
both of my 4525 and 4530 come down so hot i cant touch them,i wouldnt worry about it...
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11-12-2012 11:06 AM  7 years ago
Richardmid1

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Leeds, England

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I do know the big scorpions run hot but ide check for anything else being tight or binding in the drive system. Are they belt drive?

Whats the motor kv? Pinion size and main gear size and what head speed are you running?
60% of the time, it works every time!
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11-12-2012 11:09 AM  7 years ago
Richardmid1

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Leeds, England

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Ok did a little research so its a 910kv motor and its belt drive. Is the belt too tight, rubbing on anything or maybe it has 1 too many twists in it?

Whats the pinion and main gear tooth count and what headspeed are you running?
60% of the time, it works every time!
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11-12-2012 11:44 AM  7 years ago
MartyH

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USA

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Check your timing and the gearing. Obviously something isn't right. Heat is inefficiency.
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11-12-2012 12:33 PM  7 years ago
gwright

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Champaign Il

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Really need to get a temp gun to check it. Most motors these days have 180C magnets which is over 300F (356 according to an online calculator), however they go into thermal runaway around 200~220 depending on motor construction (how they dissipate heat), so generally I don't like to see them above the 160~180 (F) range. This being said, all my setups land in the 100 to 130 range (not scorpions), so they're pretty cool. At 130, I can't keep my finger on one more than a second or two, so checking with a temp gun is the ONLY way I can tell. 140F is about the range most folks find unbearable to touch at all (still well below the range where you de-mag). I've seen more than a couple guys complaining about scorchingly hot running motors that they can't touch, only to find out that they're not even hitting 140 when checked with a temp gun. The point is, touching the motor really gives you zero usefull data, except that if you can hold a finger even if it's uncomfortable it's basically cold in electric motor terms. Basically, check the actual temp. If it's not outside the 160~180 rang, fly,... if it is, you're probably overgeared and drawing massive surge currents.Gary Wright
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11-12-2012 12:52 PM  7 years ago
cdrking

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Seattle

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Don't forget one important factor if you are using your finger instead of a temp gun, you could have girly fingers.To hover is divine, the alternative is rather PLANE.
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