I"m going to have to agree with Aero330LX about how much power the DA has , I personaly have a BME 102 I can turn a 26X10 RCS prop at 6500 rpm I live at 7000 ft alt , My friend purchaced a aeroworks edge 540 T arf 1/3 scale with a ZDZ 80 single on it the ZDZ would turn a menz 26X10 at 6100 rpm and would just hover up here in this high alt but he dident have any power to spare so he purchaced a DA 100 .. The DA is the most powerfull 100 cc engine I have ever seen he started out with a menz 26X10 prop to break in the engine and it turned this prop with less than a gallon of fuel at 7200 rpm he has 5 gallons through it so far and now he had to go to a larger prop because he was turning 7600 rpm and the prop was ripping in the air bad . He has so much power he can hover at less than 1/4 throttle and when he goes to full throttle he accelerates vertically so fast you wouldent belive it. Im not nocking the ZDZ 80 but it will never be able to compeat with the DA 100 . This is a fact and if the guys want to put tuned pipes on the ZDZ 80 to see if they can well all you have to do is install a set of tuned pipes on the DA 100 My friend is running a 28X12 prop on his DA 100 now and he still has more power than he knows what to do with but it did quiet it down a bunch . I'm ordering my DA next week I just hope I can get one.