Originally Posted by stgdz
Its all about efficiency Steve. The 5s 600kv 13x7 combos I have really are the ticket for the 48" airframes from EF.
I wonder if they can handle a 6s wind that spins the 13x7 to 9500rpm though. I could use a pair of my 1800 gensace for a 300g battery weight.
I've previously used a 6s 480kv motor spinning a 14x7 (or 15x7) on the 51" Hobbyking Slick, which is only slightly larger and about 3oz heavier than a 48" EXP. This worked really well and was both super powerful, efficient and cool running. So 6s is definitely do-able on this size of model. Two 3s 1500-1600mAh in series would make for a really light but mega powerful set up on a 480-500kv motor spinning a 14x7. You could use a lightweight 40-50A ESC yet still pump out around 1kW of power at WOT
I'm not sure the advantage over 4s (or 5s) would be significant but it would be good for bragging rights