Message-ID: <000001bf4150$3aa5d980$0464a8c0@station4>
From: "John Barrett" <2thman@olympus.net>
To: <lancair.list@olsusa.com>
Subject: 4P gear door problem
Date: Tue, 7 Dec 1999 14:13:25 -0000
Mime-Version: 1.0

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John,

It would appear you may have three choices.

Choice one is only available if you have double wall thickness in the

door in the area where the rub is.  You could hog out the inside graphite layer and the nomex honeycomb then cover with 2 BID for more

clearance.

Second choice would be to redesign the polyethylene slider cam so it

opens the door wider at the critical point.

Thirdly, you could redesign the stiffener so that the door will not be

able to flex as much.

Since you had plenty of clearance during your drop tests (try repeating 

this test before making changes) choice three is probably the best one.

Unidirectional graphite aligned properly and built into a hat stiffener 

if possible is a good way to accomplish the task.

The flex probably is happening in the narrow part of the door just

before it widens out to cover the wheel.

Good luck.

John Barrett

             ...............................

My pilot side gear door makes contact with one of the brake bolts which is

causing a notching of the gear door.  When the airplane is up on jacks

and

the gear is cycled  there is about an inch of clearance between the 

points

of contact,so it  must be the air load that is pushing the door against

the bolt.During construction reinforcements were made to stiffen the gear

door.  Suggestions?


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