03-09-2013, 02:57 PM
Join Date: Mar 2013
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help !! with electric set up
New to this forum lark, just purchased a Seagull edge ep 540 from fleabay to continue my areobatics.
Wing span 42.7 inch
AUW 48 oz
Wing area 376.7 sq inch
It came with an Overlander Thumper V2 T3536/5 650 Watts 1450 kv (Now discontinued) and a Top gun etronix 6-10n/c2-3 40 amp Esc swinging a 10 x 5 prop and one Overlander 3s 2200Mah 25 c Battery.
So here's the story, flow this and it only lasted 4 minutes when the Esc shut down the motor, borrowed three more same spec batteries from a another club member and same thing happened, batteries were down to 4%, not good, apologised to club mate.
Bought three more 3s 2200Mah Batteries 35-75c and a watt meter, and after feeding figures in to webcalc decided to prop down to a 9 x 6 and with new batteries charged coupled up the watt meter and this is what I get.
61.96Ap – 56.11Ap
10.86Vm - 10.57Vm
667 Wp – 600 Wp
As you can imagine this thing is screaming round and shouldn’t be drawing this much on such a small prop, I put my rubbish taco on and got 9400 rpm with the following settings.
This is around where I want to be, so why is it pulling so much at WOT?
So where do I go from here, clearly the esc won’t last long and shuts down when at half throttle after a couple of minutes, too hot.
Don’t have the 10 x 5 anymore, but tried a larger prop 11 X 7 just to satisfy my curiosity and as expected pulled 71 amps at 75% throttle.
Is it the motor or Esc or Both?