Techniques > How to...

Choose an electric power setup?

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angry_muppet:
Would the easymatch motor generate enough thrust though? Is rated at 2650g on a 14x10 prop... It'll only be spinning a 10" prop.

Happy Days:
Ha!!! At just short of one kilowatt it would be the most powerful trainer I've heard of. Not even the Model County's club trainer has THAT much power and that plane can almost prop-hang on a 13x8 prop. WWEeeeeeeeee!!! ::) ::) ::)

goreyflyer:
Electric props are lighter than glow props.
So you will have to by a prop!
I'm sure you would have enough ground clearance with say the 14x10 they list plus these esc's are good the plush 60a.
I think I have one of those with a programming card too which I can do you a good deal on? 8)

Happy Days:
Hang on David, there's more to be considered than just power. ???

Learning to fly a model plane is about making corrections from both pilot and nature. In essence the student pilot is learning how to instinctively react to the models actions.

Stick a novice in the seat of a racing car and he will probably crash it. Place that same student in a slower car and he will find there is time to asses errors and discover a way to correct it. (Just bear that in mind while you read the rest...)

If you fit a big motor and a big battery into your Robbe you will increase it's AUW.
As the wings are of a fixed size this increased AUW will also increase the wing loading.
As the wing loading increases, so does the stall speed of the model.
As the stall speed increases so does the landing speed. So if the stall speed is (say) 25Kph you will never be able to land the model at 10 Kph.

Therefore; it is advisable to have as lower wing loading as possible, so the model flys as slow as possible, so the student has a s much time as possible to make corrections, before the model hits terra firma.

A 6S 5000mAh battery alone will weigh the best part of 1Kg (And that's just the battery!)

angry_muppet:
I do have a couple of 3S 2000mAh batteries, a 30A ESC (which probably won't suffice) and a motor of unknown power...

At the least then, I need a new ESC and a motor of known power (approx 500W?) and a prop...

Looks like a 14" prop would fit.  I didn't think it would as the 10x6 for the glow motor was within 1" of the ground.  I suppose the prop shaft center is in different locations depending on the motor and orientation of fitting...  8)

And if I so desire later, 2 3S batteries in series = 6S

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