Message-Id: <3.0.3.32.19991117024130.00b63c50@olsusa.com>
Date: Wed, 17 Nov 1999 02:41:30 -0500
To: lancair.list@olsusa.com
From: "Bill Maddox" <brakes1@bentonrea.com> (by way of Marvin Kaye <marvkaye@olsusa.com>)
Subject: L-IV Winglets
Mime-Version: 1.0

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CC'ed msg:

Hi Merrill Smith

    I've also put the winglets on my plane for the landing lights that are
put in the leading edge of each one. I redesigned the spars that are
internal to the winglets and moved the NACA scoop 5" down from the original
position. The relocation of the scoop allows me to later decide if I need
all the vertical portion of the winglet. 

Winglet benefits
 1. naca scoop vertically high enough so it will not expel av gas in a slip
 2. wing area increased to 105 sq. ft. with unloaded tiplets
 3. landing light area is adequate for lights 
 4. nav antenna area also adequate 
 5. more stability in thinner air
Winglet drawbacks
 1. time to build them to the wing for me was 3 months
 2. cost
 3. maybe a small loss of speed [1 or 2 kts]

I looked at all the above and decided to put them in my project.  As far as
landing your 4p you better stay with the power to flare or it will be
"sorry Merrill".  There are so many factors that come into play in a
landing and pulling the forward thrust isn't part of the equation.  Factors
are wind gust, weight of aircraft, cross wind component, speed in the
approach to touch down, angle of the descent [or vertical descent].  You
are not flying an aircraft that will forgive you if you don't correct for
the above factors in your approach.  I don't want to see you hurt in an
accident or  suffer another insurance rate increase for flying the edge of
the envelope to close to the ground.  I taught flying skill to many pilots
for 8 years and have many flight hours... atp, 737, n265 flight engineer,
turbo jet, instrument flight instructor, advanced ground instructor, 20,000
hours as pilot.

Bill Maddox

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