I've seen this so many times and thought I would give it a whirl. So I spent a few minutes in the shop with my spare fuel cap. We all travel with one, right? Picture worth a thousand words:
Looks like this on the airplane, was rotated about 40deg from straight on.
Every change obviously requires a flight test, or two, or however many it takes, no matter how small. To our amazement, this configuration increased the clean stall speed (no flaps) by 12 knots! Our airplane stalls beautifully at about 52kts clean. With the camera there, it was stalling at 64kts! You could tell something wasn't right while slowing through 80kts. By 70kts it felt down right mushy. This is not what our RV feels like at all. Of course the first indication was the noticeably longer takeoff roll. The effect on stall speed with flaps down was far less.
Maybe the -9 wing is very unique with the effect of this mount, but I've seen this setup so many times. Please be sure you really flight test it.
Now, just as a thought exercise, I wonder just how long the mount stud would need to be to not have the huge adverse effect on stall characteristics?
We're still amazed at the effect. Experiment carefully as I will continue to do
.
Looks like this on the airplane, was rotated about 40deg from straight on.
Every change obviously requires a flight test, or two, or however many it takes, no matter how small. To our amazement, this configuration increased the clean stall speed (no flaps) by 12 knots! Our airplane stalls beautifully at about 52kts clean. With the camera there, it was stalling at 64kts! You could tell something wasn't right while slowing through 80kts. By 70kts it felt down right mushy. This is not what our RV feels like at all. Of course the first indication was the noticeably longer takeoff roll. The effect on stall speed with flaps down was far less.
Maybe the -9 wing is very unique with the effect of this mount, but I've seen this setup so many times. Please be sure you really flight test it.
Now, just as a thought exercise, I wonder just how long the mount stud would need to be to not have the huge adverse effect on stall characteristics?
We're still amazed at the effect. Experiment carefully as I will continue to do