I still have the APC 18X8W on the plane as I'm breaking the engine in. This was only the fourth or fifth tank of gas through it. It is also running on a 32:1 mixture. Once I go to 50:1 Silkolene and the Xoar 20X8 prop I have for it it will totally out-do the 160 that I took out of it. It was swinging a APC 18X6W with authority but with less static thrust then this engine will produce. The 160 measured 18 pounds of static thrust with teh 18X6 and this will go to 20+ and spool up quicker with the Xoar ply prop. Weight difference is insignificant taking the muffler and on-boards glo-driver I used on the 160 into consideration. The plane comes in at about 13pounds +/- .5 but I'll get you an AUW next time I have the wing on. This forty is really small and light. Sorry for my French, I'm American. Been all through France though, Beautiful country, great food!