Shop our Airplanes Products Drone Products Sales
Thread Tools
Old Oct 21, 2001, 03:56 PM
Steve Fehr is offline
Find More Posts by Steve Fehr
Registered User
Steve Fehr's Avatar

How hot is too hot for a SP400 motor?


How hot is too hot for a SP400 motor? After flying my FMA Razor for 4 minutes, the motor is uncomfortably hot. It cools down quickly, but creating a venting hole in the front of the lid didn't seem to cool it down much. Am I OK, or do I need to take more drastic cooling measures, like create louvers to force more air across the motor?
Sign up now
to remove ads between posts
Old Oct 21, 2001, 04:55 PM
tic is offline
tic
Find More Posts by tic
tic
thunderscreech
tic's Avatar
Tough to say.. does it smell burnt?.... If you burn it up.. you'll know it... otherwise, keep it oiled and don't fly WOT all the time
Old Oct 21, 2001, 05:33 PM
DeaninMilwaukee is offline
Find More Posts by DeaninMilwaukee
Motors beat engines!
The answer according to motocalc is over 200 degrees is too hot, but the cooler a sp400 is, the more efficient it is.

BTW, too hot to touch is anything over 120 degrees. Not a very good way to measure.
Old Oct 22, 2001, 03:25 PM
Steve Fehr is offline
Find More Posts by Steve Fehr
Registered User
Steve Fehr's Avatar
OK, by that measurement, my motor is probably only 115 or so, so I'm well in the safe zone and don't really have to worry about damaging it I might add the louvers anyhow, I'll wait and see how hot it gets with the 1650mah batteries when they arive. Thanks!
Old Oct 22, 2001, 04:56 PM
Ben C is offline
Find More Posts by Ben C
Registered User

Buy a second motor . . .


Is there any way to remove the motor from the mount easily? If so, you can always solder up a second motor and use it like you would a battery pack - i.e. one in the air, one cooling.

It isn't as if S400 motors are expensive!


Ben C


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion how hot is too hot for esc and motor rmasu Mini Helis 4 May 22, 2006 05:48 PM
Question How hot is too hot for a can motor? roosevelt Power Systems 7 May 21, 2006 10:33 AM
How hot is TOO hot for a bl motor? Silverstreak328 Micro Helis 16 Sep 29, 2004 09:50 PM
How hot is too hot for motor? skyhawk Electric Heli Talk 6 Aug 11, 2003 12:26 AM
Battery temperature: How hot is too hot for LMR sailplanes jshelton Power Systems 8 Nov 02, 2001 07:48 PM