TREX450SE 15C batt gets too hot  
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All Forums >> RC Helicopters >> Electric RC Helis >> T-Rex heli >> TREX450SE 15C batt gets too hot
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TREX450SE 15C batt gets too hot - 5/2/2007 7:05:12 AM   
zope_pope



Posts: 1043
Joined: 1/19/2003
From: Aurora, CO, USA
Status: offline 		Hey Everyone,

I just setup my curves as instructed by the align instructions (100% throttle across the board and +/- 9 degrees pitch) and now the battery gets insanely hot and I lose power very quickly. I am running the 325mm blades and a 12t pinion. The battery gets very hot even just on hover flights. What am I doing wrong? Any help would be greatly appreciated. I do just basic aerobatics at the moment, but would like to keep batteries from exploding (which I am afraid of if the batteries get much hotter. No Swelling yet though). Thanks

Adam

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RE: TREX450SE 15C batt gets too hot - 5/2/2007 12:47:52 PM   
exeter_acres



Posts: 6079
Joined: 9/22/2004
From: Johns Creek, GA, USA
Status: offline 		Well... with so much detailed info.....



Which battery, what size, etc. etc. etc. etc. etc.
Which ESC....
Which motor?

Help us...help you

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RE: TREX450SE 15C batt gets too hot - 5/2/2007 1:34:56 PM   
cflight


 

Posts: 288
Joined: 1/23/2007
From: sanford, ME, USA
Status: offline 		To lower Amp draw, be sure, the belt is fairly loose and lube with silicone, adjust motor pinion back lash to give a little play, and adjust your throttle curve in norm flight mode so the motor has a chance to wind up before pitch is applyed.

(in reply to exeter_acres)
       Post #: 3

RE: TREX450SE 15C batt gets too hot - 5/2/2007 5:32:57 PM   
Rafael23cc



Posts: 1099
Joined: 5/14/2002
From: Junction City, KS, USA
Status: offline 		You are simply asking too much of a battery that can't keep up. Instead of setting the power to 100%, get a Head tach and measure your headspeed, set it at a comfortable and REASONABLE speed and check the motor temperature. Re-adjust as necessary. There is aboslutely no reason to run 3000 rpms.

Rafael

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(in reply to cflight)
       Post #: 4

RE: TREX450SE 15C batt gets too hot - 5/3/2007 12:36:49 AM   
zope_pope



Posts: 1043
Joined: 1/19/2003
From: Aurora, CO, USA
Status: offline 		Sorry guys,

I am new to the heli thing and not used to providing the relevant details. I am a 5 year airplane veteran, so while I have some lingo down, much of it I am still to learn.

430L Align Motor
35X ESC (the 6 volt bec one)
Battery is a common sense 3s 2100mah 15c.

I figured I was just asking too much of the batt. Also, am i over speeding the motor? Up here at 6000 feet with temps reaching the 80's the blades can spin extremely fast, we are talking 3400 rpms in the middle of idle up. I am guessing this isn't so good? Please help me set my curves to where I can fly 3d on the 15c batt, however if the best way to go is to just get a 25c batt, i'll go that route.

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       Post #: 5

RE: TREX450SE 15C batt gets too hot - 5/3/2007 4:02:11 PM   
Rafael23cc



Posts: 1099
Joined: 5/14/2002
From: Junction City, KS, USA
Status: offline 		I would recommend slowing the HS down a bit to help on the discharge rate, and temp. Check the flying characteristics. IF you need more power (due to altitude) maybe you can upgrade to a higer "C" rating. But I would rely on somebody with more experience to confirm that statement.

You have some special circumstances that require advice from somebody that knows a little more than I do. I'ts time for my elegant retrogrgade. Sorry. I will stay lurking for a while to find out the answer to your question.

Rafael

_____________________________

Keep your eyes on the sky but your feet on the ground!
www.runryder.net/helicopter/gallery/1469/

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       Post #: 6

RE: TREX450SE 15C batt gets too hot - 5/4/2007 5:49:56 AM   
cflight


 

Posts: 288
Joined: 1/23/2007
From: sanford, ME, USA
Status: offline 		As far as altitude goes, I can't help there but can suggest shooting for a head speed of 2700-2800. Do this by lowering your pinion.
I now I've seen 9T for 3.17 shafts somewhere.
Can you give us a little education as to how altitude affects propulsion? I now helis at high altitude have lift issues but aside from my simple understanding of molecular weight at sea level vs at high altitude, I don't know. Could stepping up to 335mm blades help move more air and lowering head speed due to reduced drag help, or a different air foil?

(in reply to Rafael23cc)
       Post #: 7

RE: TREX450SE 15C batt gets too hot - 5/4/2007 7:27:21 AM   
zope_pope



Posts: 1043
Joined: 1/19/2003
From: Aurora, CO, USA
Status: offline 		Altitude affects engines as well as aerodynamic efficiency all because the air is less dense at our altitude. As temperature goes up, the effects of altitude get even worse. Do a quick google on density altitude. It should explain everything needed to know.

I have gone up in diameter with electric airplanes because an electric engine isn't affected by altitude but because there is less air, the drag and lift produced by the prop/rotor is less resulting in a higher rpm. 335mm is a good idea. Maybe I'll go buy one and check it out. I'll post results, and thanks for the help so far.

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If you choose not to make a decision, you have still made a decision.

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       Post #: 8

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