I usually run a 9x7 on my OS25LA on a Stick type plane that weighs 3.5 lbs. It seems OK for the sport fun-fly stuff I do.

I went to fly it today, but was out of 9x7's and all I had was 8x6's. What would I expect to see with this smaller prop? Of course I expect a longer take-off, but how much vertical will I lose (not that I had that much anyway)?

Not knowing what to expect, I opted not to fly that plane today.