Chris,
Dittos. Didn't Bob Belshe say he eventually retained the vortex
generator only forward of the ailerons with better low speed control with them
and less reduction in cruise speed. If ya add gap seals ya can get the
cruise speed back and even increase control surface
aukthority..............
Grayhawk
Being somewhat interested in aircraft efficiency, two quotes from the VG
website jumped out at me.
On the Lancair page:
"
A 10 knot reduction in the stall speed; much better low speed handling and
no reduction in the cruise speed."
Then on the FAQ page:
" At maximum power, you may experience a 0-4 mph reduction,
but this depends on the particular aircraft. At normal cruising speed
there is no noticeable reduction. "
For me maximum power typically is cruise power. The speed
loss will tend to be on the higher side in a low drag airframe.
VGs locally energize the boundary layer to keep the flow attached.
This takes energy. Unfortunately a nice laminar flow section is turned
into a partially turbulent flow wing. Everything is a trade-off.
A previous link on the LML to Bob Belshe's 235 VG mod also reported a
reduction in cruise speed of a couple knots.
Here is another link to a flight test report of a Bonanza with a VG
upgrade.
http://www.nar-associates.com/technical-flying/vortex/Vgs_cruise_wide_screen.pdf
Chris Zavatson
N91CZ
360std
Sent from my spiffy iPad
Nice info on the VG's! I've been contemplating whether to install
the extended wingtips on my 360 MkII, now it looks like I have another
option to reduce the stall speed. Assuming I even need that.
This doesn't make the decision-making process any
easier.
-Rob
Lancair 360MkII
15% Complete
Pittsburgh, PA
HI THERE
here is the link for vortex generator kits for
Lancair aircraft
http://www.pnwaero.com/Lancair.htmi was very happy
with the company and with the results
peter
williams
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