I did the maiden flight of my Phoenix Extra 330S last weekend. I have a ASP S91A 2 stroke engine and it had plenty of power for this plane. My Phoenix Extra is the new one where the CG is at 100mm. I set my CG at the 100mm make and the plane balanced perfectly. I am getting 10500rpm with an evo 14x6 prop and the plane has unlimited verticle I know some are using a DLE-20 in this plane and I have 3 DLE-20's but after flying this plane with a ASP S91A I think the DLE-20 is just a little to much engine for this plane I mean with the extra added weight of the DLE-20 the plane will not be as aerobatic as with a good 91 glow 2 stroke[] Just my 2 cents since I have both of these engines. The DLE-20 is better suited for a plane in the 70" area like the GP Revoler-70