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HomeAircraftHelicopterHelicopter Main Discussion › Motor temps how hot is too hot?
03-21-2015 05:43 PM  3 years agoPost 21
icanfly

rrElite Veteran

ontario

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I have to chime in right here, GET SOME SEMI SYMMETRICAL SCALE BLADES if anything, they'll be so much more efficient too.
unsufficient cooling due to being enclosed in fuselage
a little. the whole internal system needs air flow and if a small fan will help put one in, pulling air out of the canopy is more effective than forcing air in.

good luck

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03-21-2015 11:15 PM  3 years agoPost 22
gwright

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Champaign Il

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before changing blades, pinion,..or anything on the heli,.. find a temp gun to check the motor and get an actual number. The finger touch is highly subjective. I'm a wimp and can't keep my finger on anything much over 130F,.. which is 50~70 degrees before you actually need to be concerned.I guess my finger is useless , but the infra-red temp gun isn't.<G>

Gary Wright

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03-22-2015 10:38 PM  3 years agoPost 23
Aaron29

rrProfessor

USA

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I have a scorpion HKIII that I can't touch for more than a moment after landing. And it is running fine with over 500 flights on it. So basically, touch testing a scorpion isn't possible IMO. The things run hot! But supposedly they are built for it. I did laser it at about 150. FWIW.

That said, how are you getting 8 minutes on an electric? Nice.

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03-22-2015 11:05 PM  3 years agoPost 24
JEEPWORLD2002/2

rrKey Veteran

Blue Bell, Pa

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Yup I agree the old trex 500 motor the in runner was a slug compared to the 500mx out runner motor that would be good. How much over all weight is ur ship with a 5000 mah battery ?? Most 500s run on a 20-2200 pack but yea on a scale ship that won't last long at all. So over all u might want to get a xnova or kde motor to get u a little punch to carry that weight around ? just be careful on motor diameter I know it's tight in the 500

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

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03-23-2015 06:46 PM  3 years agoPost 25
emederos

rrApprentice

Miami, Fl Dade

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I havent weighed it yet, i can actually get a total flight time of about 10 minutes with 30-35% left in pack.

Im just measuring temps right on the can itself

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03-23-2015 07:16 PM  3 years agoPost 26
turboomni

rrProfessor

East of the Equator

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That temp looks within reason.
Nice looking heli by the way!

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

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03-23-2015 08:57 PM  3 years agoPost 27
AirWolfRC

rrProfessor

42½ N, 83½ W

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Motor temps how hot is too hot?
Easy answer.
Stay below the Curie temperature for the magnets in your motor.

What temperature is that ?
. . . Depends on what kind of magnets.

Curie temps are measured in ºKelvin.
273ºK = 0ºC = 32ºF = water freezing
373ºK = 100ºC = 212ºF = water boiling

Here's a chart of different magnet metals and their Curie temps
http://hyperphysics.phy-astr.gsu.ed...bles/curie.html
and
http://en.wikipedia.org/wiki/Curie_temperature
http://en.wikipedia.org/wiki/Rare-earth_magnet

For Sumarium Cobalt, that's 447ºC or 837ºF
For Neodymium, that's 310ºC to 400ºC or 590ºF to 752ºF
. . . sintered Neodymium seems the best for strength

PS
You want to know how your Weller soldering station maintains temperature ?
. . . Curie temperature

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03-23-2015 08:58 PM  3 years agoPost 28
emederos

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Miami, Fl Dade

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Its the align 500L motor 650w

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03-23-2015 09:37 PM  3 years agoPost 29
emederos

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Miami, Fl Dade

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I cant get the laser on the bottom due to the fuselage but this is the top, should i try to get the temp gun beam in there?

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03-23-2015 09:46 PM  3 years agoPost 30
AirWolfRC

rrProfessor

42½ N, 83½ W

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The beam only gives you the approximate center of the sensing area which is quite wide.

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03-23-2015 11:21 PM  3 years agoPost 31
emederos

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Miami, Fl Dade

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So just measure the temps towards the bottom nit the heat fins?

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03-24-2015 04:07 AM  3 years agoPost 32
emederos

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Miami, Fl Dade

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http://www.scorpionsystem.com/catal...2/HK_3226_1400/ Been looking into this motor I believe I'll be worry free here...

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03-26-2015 03:07 AM  3 years agoPost 33
flyswatter40

rrNovice

kenora canada

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I have been flying a t-rex 500E for four years, the battery is supposed to be a 2600 6S and you have double the actual flying weight in there? You are loading down the motor with all the weight in it, also the stock pinion is 13 tooth so you also have lower head speed then what is actually needed and is bogging down your motor.
Try an actual 2600-3000 6S pack, your throttle curves are way off as well do to the wrong gear ratio. Rather then be worried about temp be worried about weight causing over heating due to load on motor and blades.
Normal 0-40-65-75-80
Idle one 87-86-85-86-87
Idle two 90-89-88-89-90
Unloading the motor and allowing it to turn properly with proper head speed will fix your issues. I am thinking you are 1550-1600 H\S with a heavy heavy bird. Replacing the pinion and installing a proper battery will reduce temp and increase head speed and reduce amperage to the motor causing heat. I hope this helps you out, I can 3D mine all day long. Also your flight times are way way to long as well, most people try for 4 minutes 3D or 5 minute sport\scale flying.The proper head speed is 1800-2200 sport and 2200-2500 3D.

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03-26-2015 01:50 PM  3 years agoPost 34
emederos

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Miami, Fl Dade

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How are you balancing with the 2600 pack ? Im slightly nose heavy on a 5000mah?

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03-26-2015 01:57 PM  3 years agoPost 35
gwright

rrVeteran

Champaign Il

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Although the curie point for the magnets is really high as pointed out above (thanks for that, haven't seen them in a while and always find it amazing how high they are), the motor can only shed so much heat, so there's a point where it saturates and the temp jumps up REALLY fast and runs away from you. If you ever do a lot of motor testing, all the way to the point where they de-mag, you'll see that when you reach somewhere in the 200~220~230 range (F), they then shoot up dramatically and run away from you before you can do anything. It's as if you watch the temps slowly creep up to 200ish, everything is fine, then poof they demag and the reading is hundreds above that in an instant, the current draw shoots up dramatically as they demag, and then the ESC goes poof. This is why I like to stay below 180, so there's a good cushion in place. I've seen some of the guys land repeatedly with the larger mass motors at 200~210 and they survive, but I suspect if they flew another minute the motor probably wouldn't be so lucky.

Gary Wright

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03-26-2015 04:45 PM  3 years agoPost 36
flyswatter40

rrNovice

kenora canada

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Hi, I place the battery in the front on the tray, slide it up or down til it balances, if it hits the plywood floor you may have to dremel it out to slide battery far enough ahead. A 3000 weighs more so maybe start with a 3000 then and balance it. In some scale fuses you have to mount the batteries to the floor and move them around until you get the correct c of g, your esc can also be moved ahead to help it out as well.

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03-26-2015 06:28 PM  3 years agoPost 37
emederos

rrApprentice

Miami, Fl Dade

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My 5000mah fits like a glove and gives me perfect balance,

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03-28-2015 06:14 PM  3 years agoPost 38
emederos

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Miami, Fl Dade

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Max temps I got was 117f compared to average on the align 500L 130f. The motor bolted right in didn't have to mod anything. My flight times seem to even get better I don't know why. Overall I'm satisfied 100%. The only thing I did notice was the pinion gear goes above the main gear about 1/3 of an inch I guess the motor shaft is a bit longer but I guess that doesn't really matter. I was worried at first because the top part that meets the gear isn't meshed the same as the bottom part but there is a curve on the pinion that I guess compensates with wider teeth. At the bottom it's nicely fitted with a papers thick mesh.

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03-30-2015 10:34 PM  3 years agoPost 39
emederos

rrApprentice

Miami, Fl Dade

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Today was about 80deg and after a 10 min flight my scorpion motor still doesnt break 130f, highest i got was 126f and thats after landing when the temps rise a bit

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HomeAircraftHelicopterHelicopter Main Discussion › Motor temps how hot is too hot?
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