RE: AP .15 any good?
I've got the .09 Hornet, it's a good little reliable runner. I hear that the .15 is the same case bored out. I thought it was a nice pokey little engine 'til I got a Norvel .074 which out revved it on the break in runs using the same prop (MAS 7x4).
There's no low end mixture adjustment, so the idle gets better after its broken in a bit.