Hi Joe, bought mine off Mark second hand and its already been flown with an equivalent engine mounted in the tail. I have actually rejigged the rear mounts and put shims in to compensate for the angle of upthrust. it now appears to be on the centreline of the model and it certainly has plenty of thrust at full power!! It has been flown very successfully with Tailerons so I am sticking with them, going to get a very experienced Jet flyer to set it all up hopefully next weekend if the weather is OK. Will let you know how that goes, thanks for all the tips I have been scribbling down notes on throws/CofG etc so I'm pretty sure it will be ok.