thanks for the info on the engine 615 i have decided to go for the os 90 and talking to a club member tonight he said a 90size will be good to get her going off our site . so will pick it up saturday and will put some pics on here to show all the box contents .oh forgot to mention that if you go onto http://www.jettengineering.com/hall/baker-su27.html this is a.k models su27 all that is diffrent is that this one has no air brake . but damn does this thing move and as with take off and landing very impressive. expecially the slow glide in then full power to then go all but vertical . watch and enjoy cheers paul.