RE: 2nd plane a 40 or 60?
I have a Tiger 60 and I can tell you it's a good looking stable aerobat. It makes a great second plane as it slows down nicely for landings and takeoffs are a breeze. Mine is equipped with an O.S. 91 Surpass Four Stroke and I believe it's the perfect combo. Vertical power is great, but not unlimited and with a 13x8, you won't go wrong.