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Oct 05, 2004, 01:34 PM
Registered User
Mr.RC-CAM's Avatar

Zoom brushless motor: How hot is too hot?


The E-Flite Park 370 4100KV 9T motor in my Zoom is running so hot after a couple minutes of hovering that I can sizzle the spit on my finger. The IR gun reports 210F in the hottest area, but the average is about 180F. Current during hover pitch, on the bench, is about 7A. I'm using a 3S1P 2100 LiPO pack (temperature is about 20F over ambient).

Is the motor too hot for good life?

RC-CAM
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Oct 05, 2004, 03:18 PM
Suspended Account
Yes !
Use smaller pinion and or bigger maingear . running the motor on a reduced throttle atv will also make it hot.brushless should be going near 100% throttle at desired head speed otherwse it is like trying to drive a car up a hill in fifth gear.
also check for mechanical grinding/binding ie pinion as this can effect the motors performance considerably.
Oct 05, 2004, 03:51 PM
Why not Delta?
rysium's Avatar
Quote:
Originally Posted by Mr.RC-CAM
The IR gun reports 210F ...
Is the motor too hot for good life?
My stock 400H run hot like that and was gone in 2 hours of total run (it got short).

All my BL motors run always very cold - below 150F. Actually in my Shogun the battery (2100 Thunder Power Lipo) is warmer (100F) than my motor after 15 minutes of hovering when outside temperature is about 70F

RysiuM
Oct 05, 2004, 04:08 PM
Registered User
Mr.RC-CAM's Avatar
I am using a CC25 and have tried different timing and throttle curves. I can only make it run hotter. I wonder if the E-Flite 4100KV & 9T pinion was a bad choice (came bundled with the heli)? Anyone else running this combo?

Rysium, what pinion are you using? I know you are using one of your super-duper custom wound go-brushless designs. Maybe that is the solution I need. But it would be nice to get some reliable miles out of what I already have.

RC-CAM
Oct 05, 2004, 04:16 PM
Why not Delta?
rysium's Avatar
Quote:
Originally Posted by Mr.RC-CAM
Rysium, what pinion are you using?
10T

Quote:
Originally Posted by Mr.RC-CAM
But it would be nice to get some reliable miles out of what I already have.
Save it for Hummingbird Get an Airwolf body - will run great.

RysiuM
Oct 05, 2004, 04:45 PM
Registered User
Mr.RC-CAM's Avatar
Sure, taunt that cool Airwolf body at me. 10T -- I wasn't expecting that. What sort of throttle curve are you using? I recall your motor is open frame so it has an advantage, cooling wise.

I can't find any info on my e-flight motor other than the 4100KV description on the colorful cardboard box. Would be nice to have more data. Or to hear from other Zoom pilots that have this motor.

RC-CAM
Last edited by Mr.RC-CAM; Oct 05, 2004 at 05:12 PM.
Oct 05, 2004, 06:38 PM
Registered User
barneyj's Avatar
I think that motor is too small. The E-flite 370 is similar in performance to the Himaxx 2015 series (if not exactly the same). The more appropriate motor for use in the Zoom would be the E-flite Park 400 or Himaxx 2025 (4200KV).
Oct 05, 2004, 07:46 PM
Registered User
Dr Honda's Avatar
I second that... the motor is too small for a Zoom. I'm running a park 400 4200kv motor and it's only around 124 F after a flight. I run an 8 tooth pinion.
Oct 05, 2004, 08:12 PM
Registered User
Mr.RC-CAM's Avatar
That is bad news for me. Looks like I need to obtain another motor.

I wonder if going to an 8T pinion will offer some temporary relief. Any advice on that idea? Are there any online vendors I can go to that won't want several dollars to ship a tiny pinion gear?

With R/C heli's, its always something. Tweaking, upgrading, or fixing mistakes.

RC-CAM
Oct 05, 2004, 08:15 PM
Registered User
Xnaron's Avatar
Going to an 8t pinion and running the motor always above 85% will help keep it cooler...Also www.aircraft-world.com or www.sparrowproducts.com sell heat sinks for the motor. A hacker b20 heat sink will work on it.

Brendin
Oct 05, 2004, 08:16 PM
Registered User
Xnaron's Avatar
Quote:
Originally Posted by Mr.RC-CAM
That is bad news for me. Looks like I need to obtain another motor.

I wonder if going to an 8T pinion will offer some temporary relief. Any advice on that idea? Are there any online vendors I can go to that won't want several dollars to ship a tiny pinion gear?

With R/C heli's, its always something. Tweaking, upgrading, or fixing mistakes.

RC-CAM
By far the best pinion for the zoom are the ones from www.like90.com...I have tried others but the like90's mesh the best.

Brendin
Oct 05, 2004, 09:15 PM
Really Cool User
Silverstreak328's Avatar
Make sure you get a heatsink for it! www.espritmodel.com sells them. The B20 size fits it perfectly.
Oct 06, 2004, 12:02 AM
Why not Delta?
rysium's Avatar
Quote:
Originally Posted by Mr.RC-CAM
Sure, taunt that cool Airwolf body at me. 10T -- I wasn't expecting that. What sort of throttle curve are you using? I recall your motor is open frame so it has an advantage, cooling wise.
My motor can handle up to 300W. I'm running it at 80-100W (or less). That's why is so cool. It is open, and What I found, magnets work like a blades in centrifugal fan.

I fly low and slow, so not much power needed.

Throttle curve is:
0 - 49 - 53 - 55 - 60 (percent of power)
Pitch curve is:
0.0 - 3.6 - 4.9 - 5.6 - 7.0 (positive degree)

I hover at 1/2 throttle (53% power, 4.9 degree on pitch). I keep my curves almost flat around the center for better thrttle smoothness.

RysiuM
Oct 06, 2004, 12:17 AM
Registered User
Rysium, What BL motor are u running?
It seems like everyone is running the 2025-4200 at
half throttle, Wouldn't a slower kv, motor suffice?
Oct 06, 2004, 12:26 AM
OpenPilot
dankers's Avatar
RysiuM along with Happy-Harry are too of the most knowledgable motor gurus around. RysiuM is using a RysiuMWind (tm) motor that could run a small car.

These are not availible in the shops. So call now on 555- RysiuMWind


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