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09-04-2017 12:03 PM  11 months agoPost 1
BK479

rrApprentice

usa

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Why does this motor get so hot :. I put it in a old gaui 550 with a 15 pinion on it and with the temp gun it says 160 degrees and the the hobbywing 100amp Esc stays around 95 degrees

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09-05-2017 03:12 PM  11 months agoPost 2
Richardmid1

rrProfessor

Leeds, England

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What size is the main gear and what head speed are you running?

Also what is the temperature outside?

60% of the time, it works every time!

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09-05-2017 03:44 PM  11 months agoPost 3
Pistol Pete

rrProfessor

Seffner, FL

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Above questions plus:

ESC...PWM and Timing settings?

Motor...Pole count, Brand or Model?

Main Blade...Size?

The more info, the better we can "try and pinpoint" a possible cause.

~~Enjoying the hobby one flight at a time~~

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09-07-2017 10:53 AM  11 months agoPost 4
BK479

rrApprentice

usa

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It's a old gaui 550 gears 15 50 19 61
Timeing is 8 motor pole I think 8 blades 550 head speed like 2100

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09-07-2017 07:33 PM  11 months agoPost 5
Pistol Pete

rrProfessor

Seffner, FL

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gears 15 50 19 61
Im guessing the 15 is pinion but the other numbers?

Timing 8 (?)
What is the highest number available? Trying to gauge what is the middle of the available range. Say for example, if 15 is highest, then 8 is about middle but if 10 is the highest, then it would be 5. The lower the timing, the cooler motor. The middle of the range is a good starting point or lower.

PWM (?) Based on a 6S battery, try 12Khz

2100 head speed?
Need main gear tooth count and battery cell count.

If using 6S, you could lower head speed by going 5S batt or dropping pinion to 14T

The above what I would do to get a cooler and longer flight.

~~Enjoying the hobby one flight at a time~~

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09-08-2017 12:10 AM  11 months agoPost 6
BK479

rrApprentice

usa

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Yes 6s
15 pinion
50 drive gear
19 one way
61 main gear
I have the hobbywing 100 amp Esc and the program box so can go as low as 5 degrees I think it is at 5 now

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09-24-2017 03:02 PM  10 months agoPost 7
BK479

rrApprentice

usa

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Does anyone know if the rc heli head speed calculator on the Google play store for a Android phone is accurate

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09-24-2017 04:25 PM  10 months agoPost 8
Pistol Pete

rrProfessor

Seffner, FL

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Lets figure this out...

If not mistaken, you first divide the first two gears, same for second set and then multiply them both for final gear ratio

So...
50 ÷ 15 = 3.33
61 ÷ 19 = 3.21
3.33 × 3.21 = 10.7 GR

Motor Kv × Volts per cell × cell count = RPM
1100Kv × 3.8V × 6S = 25,080 RPM

RPM ÷ Gear Ratio (GR) = Head Speed
25,080 ÷ 10.7 = 2,323 HS

At full voltage of 4.2 per cell, you're looking at 2590 head speed for maybe first minute which may be ok for 500mm blades but 550mm?

A few facts that I found when doing a little research on your heli:
>the stock motors were notorious for running hot;
>heli originally came with 500mm wood blades;
>heli was designed for two 3S batts in series where many opted to go as high as 3200mAh size. Canopy fit was the main factor in batt size options.
>some guys replaced motor with a better name brand while others rewired the original.

There were no 520mm blades when that heli came out but now its another option available, so whichever is convenient and or cheaper for you in the long run.

Hope this shine some light on your path.

~~Enjoying the hobby one flight at a time~~

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