Don:

What Minn had to say is dead about twins is dead on point: as long as both engines are running, twins fly like singles. But having flown (and lost []) two twins, and with a Wing B-25 that should be finished in the next 3 months, a few things to consider.

1) The Magnum 52 is a great engine... once it's broken in. One of the guys at our field has one in a trainer, and until he'd run about 1/2 to 3/4 gallon of fuel through it, it was pretty finicky. Now it's his favorite engine. So I wouldn't fly the P-61 until you've convinced yourself that both of your 52's will idle and transition properly.

2) Your P-61 is a beautiful bird, and it would be a shame to lose it on a twin maiden. Prior to flying the Widow, you might want to find one of the cheap ARF twins (A Twinstar or Dual Ace), and use all the servo's, receivers, batteries, engines, etc. for the P-61 and get some time on on a milder twin before going to a warbird. Yes, this costs $$$. But it might save lots of grief. (Also consider that if your radio will provide individual throttle control, and you get really brave, you can try "engine-out's" in a controlled fashion.)

3) There's a ton of info on flying twins over on the RC Warbirds sight, and in the Twins forum here.

Good luck with it,

Fred