I have had the Brillelli 25cc, 26cc, and like I said the 40cc is on order that will be going in the WH baby Edge 540 73" wing span. I currently am flying a GSP Giles 202 with the Brillelli 26cc swinging an APC 17X6 prop at 8800 rpm. The 40cc has CH EI and Scott at Brillelli balances the crank on these babies for a smoother running engine.