NICE VERTICAL PERFORMANCE? DEPENDS ON HOW HEAVY YOUR PLANE IS AND WHAT TYPE OF PLANE YOU HAVE. IF YOU HAVE THE RIGHT PLANE YOU SHOULD GET PRETTY GOOD VERTICAL PERFORMANCE BECAUSE THESE ENGINES, IF YOU HAVE THEM TUNED RIGHT, ARE VERY POWERFUL. I GOT MINE FROM MY LOCAL HOBBY SHOP FOR $110 DOLLARS PLUS TAX. HOPE I HELPED, GARY.