Gas in the .40 Rascal would really deter from the rascals beautiful flight envelope with the added wing loading. Perhaps you could find a Rascal 110 and then the DLE-20 would be ideal. I have a DLE-20 in a Sig P-51b and it is great but you said you want a "Fun Fly" type plane. This lends it's self to the larger sticks or profile planes. If I had another DLE-20, I would be looking at the Hanger 9 .90 sized Christian Eagle that is coming out soon. But again that is not a "Fun Fly" plane.