HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Oct 05, 2004, 02:34 PM
Registered User
Mr.RC-CAM's Avatar
USA
Joined Oct 2001
5,188 Posts
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
Mr.RC-CAM is offline Find More Posts by Mr.RC-CAM
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 05, 2004, 04:18 PM
Suspended Account
Joined Aug 2003
4,747 Posts
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.
will p3 is offline Find More Posts by will p3
Reply With Quote
Old Oct 05, 2004, 04:51 PM
Why not Delta?
rysium's Avatar
Sacramento, CA
Joined Jun 2003
1,714 Posts
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
rysium is offline Find More Posts by rysium
Reply With Quote
Old Oct 05, 2004, 05:08 PM
Registered User
Mr.RC-CAM's Avatar
USA
Joined Oct 2001
5,188 Posts
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
Mr.RC-CAM is offline Find More Posts by Mr.RC-CAM
Reply With Quote
Old Oct 05, 2004, 05:16 PM
Why not Delta?
rysium's Avatar
Sacramento, CA
Joined Jun 2003
1,714 Posts
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
rysium is offline Find More Posts by rysium
Reply With Quote
Old Oct 05, 2004, 05:45 PM
Registered User
Mr.RC-CAM's Avatar
USA
Joined Oct 2001
5,188 Posts
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
Mr.RC-CAM is offline Find More Posts by Mr.RC-CAM
Last edited by Mr.RC-CAM; Oct 05, 2004 at 06:12 PM.
Reply With Quote
Old Oct 05, 2004, 07:38 PM
Registered User
barneyj's Avatar
Joined Jan 2004
405 Posts
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).
barneyj is offline Find More Posts by barneyj
Reply With Quote
Old Oct 05, 2004, 08:46 PM
Registered User
Dr Honda's Avatar
Pittsburgh Allegheny, Pennsylvania, United States
Joined May 2004
1,190 Posts
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.
Dr Honda is offline Find More Posts by Dr Honda
Reply With Quote
Old Oct 05, 2004, 09:12 PM
Registered User
Mr.RC-CAM's Avatar
USA
Joined Oct 2001
5,188 Posts
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
Mr.RC-CAM is offline Find More Posts by Mr.RC-CAM
Reply With Quote
Old Oct 05, 2004, 09:15 PM
Registered User
Xnaron's Avatar
Joined Feb 2003
3,759 Posts
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
Xnaron is offline Find More Posts by Xnaron
Reply With Quote
Old Oct 05, 2004, 09:16 PM
Registered User
Xnaron's Avatar
Joined Feb 2003
3,759 Posts
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
Xnaron is offline Find More Posts by Xnaron
Reply With Quote
Old Oct 05, 2004, 10:15 PM
Really Cool User
Silverstreak328's Avatar
Tampa St Pete, Florida, United States
Joined Dec 2003
1,870 Posts
Make sure you get a heatsink for it! www.espritmodel.com sells them. The B20 size fits it perfectly.
Silverstreak328 is offline Find More Posts by Silverstreak328
Reply With Quote
Old Oct 06, 2004, 01:02 AM
Why not Delta?
rysium's Avatar
Sacramento, CA
Joined Jun 2003
1,714 Posts
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
rysium is offline Find More Posts by rysium
Reply With Quote
Old Oct 06, 2004, 01:17 AM
Registered User
Joined Oct 2003
482 Posts
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?
microflite is offline Find More Posts by microflite
Reply With Quote
Old Oct 06, 2004, 01:26 AM
OpenPilot
dankers's Avatar
Melbourne, Australia
Joined Apr 2004
1,792 Posts
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
dankers is offline Find More Posts by dankers
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Wing bird motor,how hot? helifann Ornithopters 12 Feb 09, 2006 10:22 PM
Brushless motor and lipo hot after 30 seconds... xray328 Electric Plane Talk 4 Sep 17, 2005 08:01 PM
Adding external cooling fan to brushless motor, how? sizam Power Systems 9 Jun 25, 2004 07:43 PM
Zoom 400 motor geating hot! helicopter_man Mini Helis 4 May 04, 2004 02:05 PM
Brushless motor how it works gquiring Electric Heli Talk 0 Jun 03, 2001 09:35 AM