Nilo, the engine I would recommend for a warbird would be the Magnum .61 RFS or a Saito .72. The resoning behind this is that most warbirds need a lot of power to make them fly well. The .56 Saito that I own cannot yet hover a 5.3 lb Ultra stick, at least with the fuel I am currently using that is! Now, the reson I recomend these engines is that if you decide to get into something more aerobatic later on, then you already have the engine to power a .40 size plane GREATLY!!!

I am not by any means saying that a .50 size Magnum or Saito wouldn't power it! I am just suggesting that you think down the road! For flying a warbird, you have excess power for takeoff and to power out of mistakes with these 2 engines! For cruise and realistic scale flight, you can simply reduce throttle! This gives and added benifit of longer flight times!!!

Either .56 or .72 Saito OR .61RFS Magnum should give you GREAT performance from what you have said you want! You may just want to go with the slightly larger ones for later on and some added insurance during flying!

Thanks,

Reg