ORIGINAL: rjbranchii
I flew my 4 Star with Supre Tigre .61, .75, and .90. The .90 was definately the best. Even with the .90 you will not get unlimited verticle but its pretty close to it. I used the largest prop ST recommended, can't remember now. Nice flier. Radio transmitter glitched and killed it.
bob
A good running ST90 with a large enough prop (15 x4 to 15 x6) should pull an 8 pound plane unlimited. It won't be dramatic, but it will go strait up as high as you want it to. I know that is not one of the recommended props(11-8 to 13x7). The 15 x4 or 5 zinger would be a good match--(not far from a good 13 x7 for load)
A 15 x4 or 5 pro zinger would work if you are worried about over loading the motor.
http://www2.towerhobbies.com/cgi-bin...?&I=LXFHA2&P=7