agree with ro347 - 11x5 or 11x6
l forgot to order a prop with my engine so went to LHS - and they were out of "regular" props - the gent recommended the Master Airscrew Scimitar - definitely looks like it has and does have a SHARPER bite - but also is a very quiet prop - no real noise from it - the gent it'd make the engine sound like a 4 stroke and it pretty much does
l started with and have stayed with 11x6 quite happily
with the evo 46 and 11x6 - l fly 12 minutes and still have 1/3 to 1/2 tank fuel left!!!!!

side note 1 - take it gentle and slow carving out the cowl to fit - little bits at a time - even if it takes 3 times longer than you want it to - the end product will look like a factory installation cowl and everyone will love you for it!!!

side note2 - l put mine together, set up surfaces and servos, checked c of g - bang on, started the engine and away l went and a year later still going strong - no set up, no trim adjustments - just fuel it and go!!!!