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Old Mar 19, 2009, 03:54 AM
Flyin Low
J-Bird 662's Avatar
Simi Valley, Calif
Joined Nov 2007
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Help - Fire on Seaplane - ESC running HOT

I'm kidding about the fire but i'm concerned foam may start melting.

Im running a LSSPJ with a Pentium 30, 2100 mAh Thunder Power 3S, 15C battery in a Polaris seaplane and its running hot. Im not vented and even when running at half throttle the ESC gets too hot to hold for very long although I have not had a thermal shutdown. I may have to install vents but Im curious if perhaps a Pentium 40 might run cooler. Since the ESC is located in a compartment that water can get into - I would prefer not installing the vents.

Any ideas would be appreciated.


Jay
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Old Mar 19, 2009, 06:42 PM
Wonderfully Wicked
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Willoughby, Ohio
Joined Jan 2002
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Any idea of how many amps you are using, how many servos?

Don
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Old Mar 20, 2009, 01:14 AM
Flyin Low
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Simi Valley, Calif
Joined Nov 2007
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I can't tell you how many amp as I don't have a watt meter - yet. Ill see if I can find someone to get a current reading on it. I'm using 4 HS 65s for servos. I think I'm getting about 10 min of flight time out of the 2100mAh. The Polaris flys really nice and using the programming card makes reprogramming the Pentium ESC's a breeze.

I hope that helps,
Jay
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Old Mar 20, 2009, 01:29 AM
Wonderfully Wicked
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Willoughby, Ohio
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My guess is that part of the heat may be from the BEC since you have 4 servos. The BEC is probably working hard to run all four so gets hot. Going to a Pentium 40 will definitely help that as it has s 3 amp switching BEC instead of the 2 amp linear BEC that the pentium 30 has.

VERY nice looking model!

Don
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Old Mar 20, 2009, 02:01 AM
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Simi Valley, Calif
Joined Nov 2007
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Thanks Don,

How can I test this - Can I plug in a Battery and let it sit around possibly with the motor running slow?

I'm glad I ran into this problem now as I was going to order 2 other Pentium 30s today and now I may need 3 40s. Do you have them in stock Don?
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Old Mar 20, 2009, 07:22 AM
Wonderfully Wicked
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Willoughby, Ohio
Joined Jan 2002
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Just sitting does not tell you anything becasue the servos are not moving. You would need to plug the ESC in and wiht no throttle move the sticks all around as if you were flying, then check the temp to see how hot it is getting. As far as stock I have a bunch of 40 amp ESCs in stock right now.

Don
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Old Mar 20, 2009, 08:27 AM
Speed Freak
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United States, OH, North Olmsted
Joined Nov 2005
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J-Bird,

I had the same issue going on with one of my models running 4 servos. I switched from the 30A to 40A pentium ESC and the heat issue went away. I agree with Don and believe the Pentium 40A with it's 3A switching BEC will do the trick for you, it did for me.

Best of luck to you and very nice plane you have there!
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Old Mar 20, 2009, 11:18 AM
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Thanks Spid, I'll have them on order today.

-J
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Old Apr 01, 2009, 11:35 PM
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Simi Valley, Calif
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Just to follow up - The Pentium 40 worked great!

Thanks Don,

-J
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