I have the World Models .40 size Ultimate Bipe and it is almost identical to the Nitro Models. The Evo .46 PTS engine that came in your Hanger9 PTS Mustang will be more than enough for that little Bipe. I am running an OS .46 fx in mine. As far as props, I would use an 11x5 or a 10x6 2 blade APC or Master Airscrew.