...that is if you fly at sea-level.
Almost...the flatlands of Nebraska.
Well, I just got back from spending my lunch hour at the LHS talking with the seasoned verterans and they all recommended NOT going with a prop as small as an 8x6. After the many stories about the good 'ol days and all the 25 powered C/L and R/C ships they have had (these guys are all 65+) they said to stay around 9x5 to 9x7. Even though it's only a 25LA, they said I would be very disappointed in the performance of anything smaller than a 9x5, especially since this bird jumps into the air in 15 feet on a 9x7.
Obviously this seems to be less rocket science and more of a "feeling" thing. Hmmm......