Boy, I've been riding this fence on this subject now for 8 months. I am flying mine with the 3.2 Brison, but have always wondered about the 4.2 combo.

I had a G62, and a 4.2, and my 4.2 was at least 8oz heavier than the G62 w/Spring starters.(RTF). But with servos in the tail, fiberglas gear, carbon tube, and carbon spinner, you may have a good combo that wieghts lighter than a stock WH with G62, and swing serious prop.

Hmmm, on the other hand, stay as light as you can. DA 50 ?