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[packy46]

Hello:
Thought I knew this one....but.
The set up, 2 x Graupner Speed/Torque 720 BB,direct drive to a pair of 4 blade 88mm props.
The motors are rated at 13.5 amp stalled current load per motor, at 75% max efficiency.
I will need two ESC's,to complete my system.
I'm told I need a 40,50 ,60 amp ECS,is that overkill ????.
Will a 20 or 25 do,and be safe.I do plan to put in line fuses,and switches.
 Looked in the post first,needing help.
Thanks
Tim

[sheerline]

Tim, I would have thought a couple of 25A units would do the job, perhaps some of the other chaps can also recommend something suitable.
Chris

[Shipmate60]

If the motors stall at 13.5 amps anything from 15 amps and above, but protect with 10 amp fuses.
But 88mm props do seem rather large for this motor.

Bob

[packy46]

Thanks Gentlemen:
15's or 25's it is....
About the 88MM,my first time, luckily I bought them is plastic. I'll be watching for heat,and possible down sizing
Thanks for your  great replays.
Tim

[FullLeatherJacket]

http://www.action-electronics.co.uk/pdfs/P94.pdf

The Lite version will do the job. Certainly works for three customers with these same motors.

Suit yourself............. but 88mm props is definitely going a bit strong.

FLJ

[packy46]

Hello FullLeatherJacket.....
No- No, I'm here to learn, hows 62mm's , I'm just trying to get the right set up w/o doing the Davie Jones thing on the way...
Any help much appreciated.
Thank
Tim

[Shipmate60]

packy46
It depends on the pitch on the props.
What model are they powering?

Bob

[packy46]

Hi Bob:
It's a scratch built 60" Navy LCM approx 1/15 scale. It will probably weight about 25 to 30 lbs. after ballast.
So unless there is a chart, or math calculations to do am I looking at trial and error ?
Any help appreciated.
Thanks
Tim