HI.. I HAVE FLOWN IT WITH RAMTEC FANS,OS .91.,,AND DYNAMAX,S WITH BVM .91..{BETTER} WILL FLY WITH 12/10 PROPS ,, 4 BLADE,CUT TO 8" DIAM.. .61 OS MAX ..I HAVE TWO RAM 500 IN IT NOW.. 22LBS, FANS,,DRY,,28 TURBINES..TAKES OFF BY ITSELF!!..80 FEET..TOP SPEED EST. ,,130MPH..LANDS AT, 35 MPH.. BEST GRASS FEILD PLANE,,ENGINES HIGH,BIG WHEELS..ITS WORTH THE WORK,,YOU'LL LOVE IT ..HAVE FUN RD