Message-Id: <3.0.3.32.20000508014622.02fe7480@olsusa.com>
Date: Mon, 08 May 2000 01:46:22 -0400
To: lancair.list@olsusa.com
From: Marvin Kaye <marvkaye@olsusa.com>
Subject: LNC2 Flap delamination
Mime-Version: 1.0

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
Posted for Sky2high@aol.com:

In a message dated 5/7/00 11:46:48 PM Central Daylight Time, Tracy writes:

<< Flap problem:
    We didn't build our plane so I don't know how this happens but...  Our
 passenger side flap skin peeled back nearest the wing tip. <<<<

1) LNC2 flaps are very long with the rigid deployment pushrod is very close 
to the inboard edge. The flap is subjected to tremendous twisting force when 
deployed (especially at higher speeds or full deployment).  It is important 
to check the integrity of the flap skin/spar intersection and repair if there 
is any indication of delamination.  It could be a bit uncomfortable if one 
flap breaks.

2) Any chance of the flap hanging up on the wing during retraction makes 
go-arounds very dicey -- especially if it is only on one side.

Perhaps you could adjust the down stop on the flap motor to reduce the fully 
deployed angle so that the air cannot possibly lift the curled flap leading 
edge above the wing skin.  

The leading edge flex could be controlled by installing "keepers" every foot 
or so.  These are 1/4 inch prepreg pieces glassed between the curl and the 
flap forward spar.  This is the standard fix to ensure that, if there is a 
gap, the skin cannot be distorted upwards and jam against the wing skin.

If you aren't happy with the curl or curve of the flap leading edge, some 
adjustment can be made with use of a heat gun after clamping in the desired 
curve (flap off the airplane of course).  You may want to consult a local 
composite builder for guidance.

Scott Krueger
N92EX


>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>