David,

I spent all day at the field flying yesterday (I was there at 7:45 AM, flew until 7:30 PM, and left after the fireworks about 10:00)! 14 models flown, several maidens or first in a long time. The jet jocks were there too. Some day ...

You definitely want the highest C rating you can afford, and the largest pack as well. The idea is to keep the voltage as high as possible. I had several flights on the Gulfstream (propped with 6x5.5E APC) and the SF props are definitely better than the E for this size. Heat and vertical performance go hand-in-hand, it seems. The 7x5SF was much nicer, a little slower flying, but up and down lines had more consistent speeds. Long vertical lines were possible, but the motor was pretty hot afterwards.

We were playing with wing loading vs. battery size on another plane, flying one designed for 2000's with a 3500 instead. It's worth the 2 MPH landing speed increase! If you got the room, pack in the electrons!

Andy