How about the 9, Scott? Vfe for 10 degrees is 87 kts. Anything more than 10 deg is 78 kts. Do you fly at 90 kts into osh with 10 degrees (or full flaps?) with no issues?
Yes, even the 9, but I will clarify......
My personal RV-6A has manual flaps. Half flaps (20 degrees) for the type of flight condition we are talking about is way too much. It just causes more drag which requires more power usage and potentially higher engine temps. It is for this reason that I have a flap indexer that also has a 10 degree position. This is about what I use for all of the short wing RV's.
The RV-9 and 10 have much larger flaps that produce a lot more pitching moment than the flaps on the short wing RV's (that is largely why the horizontal tails are so much larger than the others).
On the RV-9 I use what is probably about 5 degrees. On the RV-10 I un-reflex the flaps plus add just a bit more so it probably ends up being about 5 degrees also.
The primary reason I do this is to reduce the deck angle slightly, not to effect the stall speed (which a small amount of flaps has little to no effect on anyway).
The reduced deck angle (because of the reduced wing AOA) improves over the nose visibility, and it makes the airplane feel a bit less mushy.
Before using this technique flying the Fisk arrival, I recommend people practice before hand and see what works best for them.
As for comments about overtaking/passing aircraft that are too slow........
There is no air police posted along the arrival corridor so there is nothing/no one to stop you, but it is against the rules.
I know that flying too slow (unless your airplane just can't go that fast) is also against the rules, but two wrongs don't make a right.
The whole thought of it brings the memory flooding back from quite a few years ago, of Jerry Vangrunsven telling the story minutes after witnessing a midair between a T-18 and and a C-170. It was caused because of a slower airplane passing a faster one. The T-18 pilot didn't see the Cessna because it was slightly lower and he was descending to get on altitude as he passed another airplane.
I could write a small book about some of the other shenanigans I have seen over the past 23 years of flying the Fisk arrival
Airplanes not all at exactly the same altitude is one of the common problems......