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'Tail Feathers'
That unique horizontal stabilizer with its inverted airfoil on the 701 looks great in theory, and works well enough with power on, but can’t flare to a high AoA at idle power. That problem has plagued many 701 flyers, especially if they have a forward CofG. And it would be a real problem in an engine-out landing.......
We’ve been working on that problem and have found a very effective fix!
We tried VGs under the 701 horiz stab with moderate success, but then found that the very best effect was to place them near the leading edge of the elevator itself. In this position the VGs are hidden in the slot between the horiz stab and the elevator at cruise, but extend down into the airflow when the elevator is deflected up, as in the flare to a landing. This puts the VGs right in a high velocity airflow, just where they can be most effective.
There’s a great improvement in control and safety, with no downside at all.
‘Tail Feathers’ are even more beneficial for all those 701’s still with slats, since more elevator authority is required to pull the high AoA necessary for slats to become really effective. To order your 'Tail Feathers' go to the "Ordering Feathers VGs" page.
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JG,
Installed the Tail Feathers VGs on my 701 today. WoW! What a difference. At flair, I can now chop the throttle and hold AOA to touchdown. Don't need the power to land.
My CFI is also very impressed. Thanks for the good work you have spent in development. The installation was very easy and straightforward.
Regards,
Ken, North Carolina ............................................................................................................................................................
Hi John,
I had another fly around yesterday with the VGs under the elevator. I put them on at 30 mm spacing as you suggested. Boy, does that make a difference!
701, Dave
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(Note: Dave was the first to suggest the idea of putting the VGs on the elevator rather than the horiz stab – thanks Dave!)
Hi JG,
Yes the Tail Feathers are definitely the ticket. Installed them on the elevator and have about 20 landings. It is sure nice to have the elevator control right up to and even after touch down.
701, Cam
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