HOMEBREWER reports a THUNDER TIGER .91 FS was reported to turn an APC 14x6 at 10500 on 10%... don't know the other details. The only reason I remembered the numbers was because I wanted to buy one and researched it here first. BTW, I did buy the TT FS 91, but haven't run it yet. I am going to put it in a CMPRO/GSP Spitfire.