Re: Tuft test video


One Sky Dog
 

Jay.
Interesting. My Dragonfly sparrow strainers are almost 2” below my elevator trailing edge and set to not exceed critical angle of a Clark type airfoil with respect to the bottom of my elevators.

I flew the Tri-Pacer to Copperstate fly in Thursday and camped Thursday and Friday. We got a call for a fly in barbecue at the local to Benson air park 11LZ Whetstone this morning. So we packed up and left before they closed the field for the STOL Drags. Went to Whetstone and had a nice lunch then back home to Benson.

On Saturday, February 19, 2022, 5:37 PM, Jay Scheevel <jay@...> wrote:

Hi Guys,

 

I put the camera back on today and added some yarn tufts to the side of he fuselage, the canard root strake, the elevator and the sparrow strainer.  The video goes from runup through take off, then a pass at 1000 AGL along the runway and normal cruise with a couple of slow climbs. The tufts seem to lay down nicely with my contours on the strakes, which makes me happy, but the tufts on the sparrow strainer show that it is perpetually stalled. This is shown by the tufts from the top of the strainer wrapping around to the bottom of the strainer and occurs  at any airspeed above 80 mph. Alhtough the sparrow strainer works nicely to push down against the up-pushing of the undercamber on the elevator, this is a huge drag point on the airplane, and I am sure it limits the high speed performance significantly. There has to be a better way to do this …….

 

https://youtu.be/N-Gnd_CSywA

 

Cheers,

Jay

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