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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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