Helicool,

I think mikel pretty much summed it up..

I've noticed that the trend today seems to be if the manufacturer says use a .61 then a .91 is by far better.. I don't 100% agree with this.. For every person that says more power can't hurt and you can allways throtle back. I say yes your right after you have learned throtle management will become second nature but untill then you will be concentrating on keeping control of the plane and will probably only fly it at a constant throtle setting that your instructor has determined for you.

Now I'm not starting a war here since I realize how many take the "Tim Taylor more power ugh ugh approach" when selecting a power plant for their model.

One thing I will say is that I've personnally seen many trainers crash and burn on aborted landing approaches when the "pilot" slams on full throtle and the torque and resulting stall causes the plane to spin in from 10 feet.

If you start out using the .46 and actually learn how to fly the plane on the wing as opposed to the engine I believe you will become a better pilot quicker.

In the past 8 months I've learned more about "fine" tuning my control inputs during flight from flying my GWS tigermoth then any other plane. This plane is under powered and requires you to fly on the wing. It also has a lot of drag because its a biplane which requires you to manage throtle the entire way in if you want to grease the landing.

Just my opinion but I would first use the .46 and then evalute the need for a bigger engine based on you actual experience rather then buy a new engine based on speculation.

Please note I feel confident making this statement because of the high lift generated by flat bottom airfoils found on most trianers if this wasn't a trianer but a sport or warbird with a much higher wing loading then my advice is to select an engine in the middle to high end of the manufacturers range.