Retiring and coming back to the hobby after a 15 year hiatus.

I have an interest in IMAC. Not 3D, just IMAC pattern.

I do have several questions for which I would like some input on before embarking upon the acquisition of a suitable aircraft.

What is an ideal aircraft weight and engine size?

Although somewhat theoretical, what “power to weight” ration makes an ideal IMAC aircraft?

Thanks in advance,

DR