As I said, my personal experience on three different 160 or 180 hp's
stubby-winged Cherokees is consistent... they help a lot more than one
would think at
the low end. Nothing substantial at the high speed end.

One thing no one has mentioned: Art Mattson's VGs are bigger than most.

Although there are fewer of them than on most applications I've seen, they
look wickedly dangerous to me. (As in sharp.) Cleaning around them has got
to be a real pain, especially if you slip and slice your wrist on one of
them.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"