Dave wrote:
: OK, after a lot of research, we are looking at installing AMR&D's
: Vortex Generators on our Warrior..

: Anybody out there with expirence with these?

I'm only familiar with them on 160/180 hp hershey-winged cherokees. In those
planes, I can attest to the following (having done before/after)

- At medium load (full fuel, 2 people), full flaps slow-flight power-on stall at 60
mph IAS without. WITH the VGs, it's 60mph *flaps up*, and you can hang it on the prop
at 45-50mph.

- Significantly reduced sink rate at approach airspeeds. You really do have to
re-learn how to land it.

- Slightly increased climb rate... maybe 100 fpm... less sink = more climb.

- Negligible noticable impact on top and cruise speed.

- Gotta watch out on reduced control effectiveness at the lower airspeeds they allow
you to fly at. In particular, deeper stalls (makes wing-drop more likely), and
crosswind landings. STOL mods like that are almost a liability in strong crosswinds.
That said, I've landed my 180 with them at 25G35 cross.

Bottom line: They work great. Just gotta remember not to step on them when
you get in the plane... especially passengers.

-Cory

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* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
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