Mailing List lml@lancaironline.net Message #53300
From: kneaded pleasures <kneadedpleasures@sbcglobal.net>
Sender: <marv@lancaironline.net>
Subject: Wingtip extensions for 320/360?
Date: Sun, 25 Oct 2009 20:46:41 -0400
To: <lml@lancaironline.net>
Dan:  Having flown frequently in various 200 and 360 style of Lancairs,I find copious advantages to the long wing and just a few mild disadvantages.
 
The long wind advantages are:
    -slower takeoffs
    -slower landings
    -less tire wear (takeoffs are shorter)
    -less brake wear (landings are shorter)
    -lower stall speed (57 mph in my 360 at gross)
    -all of above permit more options to use short fields
    -faster climb (more wing lift)
    -longer glide (more wing area)
    -faster speeds at all altitudes (lower angle of attack at all speeds)
    -slower lateral roll rate (makes chop and turns more comfortable for pilot and passenger)
    -safer accident speeds (minimum landing speed is reduced)
    -accidents are more survivable (no one would get hurt at 10 mph)
    -traffic pattern flying is safer (slower speeds possible because of lower stall speed)
    -time to climb to altitude is reduced
    -engine out glide is improved (more time to "think" and maneuver to alternatives)
    -more fuel capacity (I don't recommend this option; 1000 mile range is plenty)
 
The several disadvantages are:
    -reduced maneuvering speeds (potential to overstress our quite strong wings)
    -reduced wing loading causes (nearly) imperceptible reduced comfort in chop
 
The above lists are not exhaustive and surely others will add or subtract.
 
Remember that Lance endorsed the long-wing which suggests that the longer wings don't challenge structural integrity in our planes.  Also remember that it was not by accident that Nature designed long-distance birds to have long, thin, narrow wings; they are simply more efficient and energy efficient at flying.  OTOH, if you fly gut-wrenching, severe "G's", then long wings will not answer.
 
Dan, I recommend that you not make those longer wingtips removable; you won't remove them after you fly them.   Greg Nelson  (LNC2)
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