Mailing List lml@lancaironline.net Message #1152
From: <CHRISTOPHER_ZAVATSON@udlp.com>
Subject: Aircraft Jacks
Date: Wed, 18 Nov 1998 07:07:07 -0600
To: <Lancair.list@olsusa.com>
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            I must put in a plug for the jack pads as provided in the 320/360 kit.     As shown in my standard kit (slow build) manual, loads would not be     sufficiently transferred from the pads to the structure.  I extended     all the bid plies that create the fuselage/wing spar junction down     across the jack pad.  I overlapped the plies coming down the side of     the fuselage and those coming down the rear of the spar.  This creates     something like a 20 ply lay up in the corner right above the pads.      Jacking loads are thus nicely distributed along the spar and fuselage.
        I agree with the comments warning against lifting the plane from the     engine lift ring.  There is probably a good reason 6 cylinder     Lycomings have 2 lifting rings.  Also you generate large bending     moment in the fuselage center section, similar to a high negative G     maneuver.
        Chris Zavatson
    N91CZ
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