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Peter, Here is an internet link – result of search for “Lancair stall strips”. http://mysearch.avg.com/search?cid={DF67323F-EA5D-4845-9C48-B1AE78F50130}&mid=87fd74441dc0e1a71d1e6db14a570ecb-2b7c2e163abc66063bcba19b555719dba35a89ba&lang=en&ds=AVG&pr=fr&d=2013-01-26 08:12:28&v=14.2.0.1&pid=safeguard&sg=1&sap=dsp&q=lancair+stall+strips There seem to be quite a few references. The first hit is Mark’s notes from one of our Lancair Builder’s meetings that demonstrates much of his thinking at the time. We had a group of about 12 different IV projects for a decade or so here in WA state. There is a more definitive paper he wrote I recall that discusses his research and experiments with the strips, leading him to conclusions of their efficacy. I believe test pilots were involved and the strips were tried in numerous places until the best results were achieved. Sorry I can ‘t be more specific. John Barrett N31VP --- no stall strips ---- yet. From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of PETER WILLIAMS
Sent: Wednesday, June 05, 2013 5:55 AM
To: lml@lancaironline.net
Subject: [LML] Re: VORTEX GENERATORS ask the vender hi there
i would love to learn more about the stall strips. are there photos? is there any design data? drawings?
i asked Len Fox about stall strips and i did not get a clear answer such as you are giving. Well he is a test pilot and does write a concise report of conditions.
thanks for any leads or information that you might have
peter
To: lml@lancaironline.net
Date: Tue, 4 Jun 2013 16:05:46 -0400
From: 2thman1@gmail.com
Subject: [LML] Re: VORTEX GENERATORS ask the vender One additional thought. Mark Kirchner of Mercer Island, a Boeing engineer, designed stall strips years ago. He gave me my first lesson in composite work while he was building his Lancair. These strips have been thoroughly tested by Len Fox and others. They don't lower any of the critical speeds, but they do provide aileron control and more docile departures during a stall in this unforgiving beast. Mark passed away a few years ago but his idea was a good one and lots of IV's have safer performance because of it. The web site does say all you are reporting except the fact that Len Fox has done some testing, I assume for you? Was that on a IVP? They also don't identify themselves by name or credentials and I had not heard of them. JOHN
len in his analytical way reported the reduction of stall speed (he did a before and after)
i was hoping that when we put the VG at 8% of chord we could improve aerolon authority at or near the stall. no such luck.
len had no negative thoughts, as far as i know, about the VGs
from my conversations with the supplier, they had done VG for certified airplanes prior to developing VGs for Lancairs.
call them, they are very forthcoming
peter
To: lml@lancaironline.net
Date: Tue, 4 Jun 2013 09:55:19 -0400
From: 2thman1@gmail.com
Subject: [LML] Re: VORTEX GENERATORS Who are these people? Anybody know? Just curious. What do Len Fox and Dave Morss think of these things? Seems like test pilot reports would be useful. John Barrett
Sent from my iPad Just ordered a set for my 235. 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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