Hello; How much time do you need? My big Taube will do 90 minutes on 18 oz. with it's Laser 100, but it's all at the idle once it's up in the air. I had a Sig Mid star 40 with a Saito 45 that would easily do 20 minutes on 12 oz.

I find my attention span wanders after about 7 minutes, and it has taken quite a bit of training to work up to those long flights. If you watch a new flyer they will visibly tire at about 6 minutes, recover and then again at about 10 minutes, at which point you should land the plane, unless you want to see a crash. The extreme concentration required is costly, and a beginner shouldn't push himself that far.