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All Forums >> Electric Aircraft Universe >> Brushed/Brushless motors, speed controls, gear drives >> flight duraton very low with Lipo 2200 need help
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flight duraton very low with Lipo 2200 need help - 9/25/2012 6:41 AM   
suzonka


 

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From: calverton Long Island, NY, USA
Status: offline 		I have an e flight PT 10 , made bt e flight , Im using a turnegy hobby-king motor 95 KV
a 30 amp ESC with a 9x5 gws HD prop and a 3S 2200 mah battery lipo.
everything works fine with 4 Servos . the only problem is that the duration is very low ,maybe 4 minutes and the motor slows down and I land and drive the plane back to me . now when I check the cells , with a volt meter I get about 3.7-3.9 volts still left in the battery on each cell , and the cells aren't hot , what could be causing the low flight duration time , because I have used these same batteries on 2 other plane with the same approximate props and motors just different ESC's and a different receiver . whats the problem could it be a bad ESC shutting down to soon or getting to hot?

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RE: flight duraton very low with Lipo 2200 need help - 9/25/2012 12:51 PM   
guver


 

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From: LaGrange, OH, USA
Status: offline 		It sounds like the esc is doing it's job of "LVC" and the battery is just weak. I think a higher quality new pack would "fix" this. OR the LVC is set too high. You're landing with about a half battery left. I suppose it COULD be a connection between the two also.

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RE: flight duraton very low with Lipo 2200 need help - 9/25/2012 2:14 PM   
pilotpete2



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Status: offline 		You didn't mention what the current reading is at WOT. A Wattmeter is a must, when you know what the actual current is , then you calculate the flight time for the battery capacity (gas tank ) you're using. If you're drawing anywhere 30A with a 2200mAh battery, your flight times will be quite short.
Also, since your battery is showing safe voltage levels after the flight I suspect the battery's C tating maybe not up to the task.
Pete


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RE: flight duraton very low with Lipo 2200 need help - 9/25/2012 2:57 PM   
cyclops2



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I go for loose connection or the plane NEEDS more power than the other planes do to fly.

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RE: flight duraton very low with Lipo 2200 need help - 9/25/2012 11:32 PM   
suzonka


 

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quote:

ORIGINAL: pilotpete2

You didn't mention what the current reading is at WOT. A Wattmeter is a must, when you know what the actual current is , then you calculate the flight time for the battery capacity (gas tank ) you're using. If you're drawing anywhere 30A with a 2200mAh battery, your flight times will be quite short.
Also, since your battery is showing safe voltage levels after the flight I suspect the battery's C tating maybe not up to the task.
Pete

============================================================================================================================

Going to check the amperage on the ground , the motor is only rated for 26 amps but get this the manufacturer of the ESC sent me this a complete programing guide I have the Pentium 30 amp ESC and it has all sorts of settings, could it be the threshold setting set wrong ,I never messed with any programing should I just set it to default if I can/ check this out

http://www.hobbyking.com/hobbyking/store/uploads/113002679X16958X28.pdf

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All Forums >> Electric Aircraft Universe >> Brushed/Brushless motors, speed controls, gear drives >> flight duraton very low with Lipo 2200 need help
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