one of the guys at my field have that plane with the DLE 30 instead of the 20. You can then run a 4 blade prop from troy built models

http://www.troybuiltmodels.com/items/BP178-4.html


this one is the 17.3x8 four blade P-51 prop and they also have a 16x8 prop also in the same scale look. I am not sure which one to run on the either DLE but i would think the 20cc could pull the 16x8 but not super strong but would look great.