----- Original Message -----
Sent: Friday, April 25, 2008 10:28
AM
Subject: [LML] Window Strength
The hole that has always concerned me is the inspection
hole at the smallest diameter of the IV fuselage, just ahead of the horizontal
stab. Next time your near a IV hold the tip of the horizontal stab between
your thumb and index finger and apply 3 pounds of force alternating in an up
and down direction. Increase the frequency until you hit the resonant
frequency. Continue applying the 3 pounds of force at that frequency and watch
the amplitude increase. Try it with and without the cover attached.
If I had a IV I would attach that cover with many screws
and keep them tight.
This does not work on the small tail 360, the resonant
frequency is too high.
Regards,
Bill Hannahan
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