I agree w/Barry,you want a little more umph! I used Sa 100 in the .46 Do! (assuming you are going 3-D)The Sa 1.25 is only marginally more than the 100 IMO,this plane will take up to 1.4 2 stroke but that is a bit too heavy,I would go with YS 1.10 if you can afford engine & fuel,otherwise a good 1.00 to 1.2 2 stroke. All I have ever used is Hitec 635 (85 oz @ 6V)Karbonite for this plane and they are awesome,after hundreds of flights,little to no slop. Beef up the landing gear blockes and firewall with tristock then fuel proof inside fuel tank area & all exposed wood.If you want a plane that will harrier all day long(less windy days),add tristock to the wing trailing edges to get double beveled edges for maximun spoileron throw,if you are willing to use spoileron mixing,you can get the .60 Do to be a harrier machine.Use at least 4/40 control rods,2/56 doesnt make it IMO.