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Speaking of gap seals, any recommendations on where to get them, how to attach them, whether to put them on a painted surface or sand it down? Danny LNC2-360 Mk-II Nothing is foolproof to the sufficiently talented fool. From: Sky2high@aol.com [mailto:Sky2high@aol.com]
Sent: Friday, June 07, 2013 9:41 AM
To: lml@lancaironline.net
Subject: [LML] Re: VORTEX GENERATORS 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.............. 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." " 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 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.
HI THERE
here is the link for vortex generator kits for Lancair aircraft
http://www.pnwaero.com/Lancair.htm
i was very happy with the company and with the results
peter williams
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