naumuk(at)windstream.net
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 Posted: Tue Aug 18, 2009 10:20 am Post subject: VGs, final |
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Attached is the EAA Tech response- very encouraging. My take is, install the VGs before Phase I testing and you're OK. Archive this with 5 stars-
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Hi Bill,
As a matter of fact, anything that is fixed and does not require any input from the pilot that is used to reduce the stall speed of an aircraft will not jeopardize the LSA status of the aircraft . VG’s, fixed slats, dimple tape that is affixed to the airfoil, and any other fixed, non-deployable aid can be used. Whether these aids actually work or not is determined during Phase 1 testing. If they do not result in a stall speed of 45 knots (52 mph) or lower, then the aircraft is not LSA compliant. The key factor is pilot input, which is why extending flaps is not allowed to meet the stall speed criteria – the pilot must do something to make the flaps extend, which adds to the pilot’s workload during a critical phase of flight. If you have any further questions, please contact me.
Cheers!<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
Tim
Tim Hoversten, EAA #598743
Technical Aviation Specialist
From: Bill Naumuk [mailto:naumuk(at)windstream.net]
Sent: Tuesday, August 18, 2009 9:39 AM
To: info services
Subject: Vortex Generator
EAA-
Once again, the question of whether vortex generators can be installed on a Zenith 601HDS wing to ensure LSA compliant stall speed has come up on the Matronics list. Can VGs be installed prior to Phase I flight testing to enhance the probability of legally meeting LSA stall performance limitations?
Thanks.
Bill Naumuk
Townville, Pa.
HDS N601MG/Corvair 95%
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