help !! with electric set up

[bigjh]

Hi all

New to this forum lark, just purchased a Seagull edge ep 540 from fleabay to continue my areobatics.
Specs below.

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.

WOT

61.96Ap – 56.11Ap
10.86Vm - 10.57Vm
667 Wp – 600 Wp

75% Throttle

58.8Ap
10.49Vm
632Wp

50% Throttle

18.63Ap
11.28Vm
185Wp

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.

34.48Ap
10.79Vm
373Wp

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?