RE: Sig four star 60 engine choice.
I've flown two 4*60s with a Magnum 91 four stroke. My prop of choice was an APC14x4W. You could lift off a go near vertical with that setup. The plane weighed in at around 9 lbs, including a half pound of nose weight. I would think more power would not be much better and could lead to some evil ground handling issues. I've got a Twist 150 with a Saito 180 in it and it is really way to much power. I know, there is a throttle stick in the TX, but my tendency is to get up flight speed then go full throttle before lift off.With the Twist, and a couple other over powered planes, that has presented quite a problem.
Don