Matching prop size to engine power to model weight

Yes there are!

There are a few charts based on prop loading, disc loading and other criteria on our new club site.

in the documents section.

FredD

All of these seem to be based on gas engines.

Any help for the electricals?

That's a whole 'nother can of worms! Because of gearing, electric motors can swing a wide variety of props. There are some ways to calculate what kind of power is required in certain models. One is "watts per pound". Watts are volts x amps. With 50 W/lb., the plane barely flies. With 100 W/lb., you can do 3D provided you have adequate control surfaces. Your best bet is to get a program such as MotoCalc, available at

Morris

Or ask me.

Dependong on teh flying speed, many parkflyers zoom arund nicely on less than 30W /lb. 50 is more than adequate for sport/scale.

With 100

No, more like 120W/lb for any decent top speed...

I'll add around 75W/lb for warbird or fast aerobats.

Even then its non trivial.

Best ios to pos up plane, size, weight, what motor and box, and ask...