From: hickham@webtv.net (John Hickham)
Date: Sun, 13 Feb 2000 12:42:36 -0500 (EST)
To: lancair.list@olsusa.com
Subject: Lancair IV P  Forming a pressure barrier around the aileron
	torquetube
Message-ID: <4018-38A6ED0C-10262@storefull-136.iap.bryant.webtv.net>
In-Reply-To: lancair.list@olsusa.com (Lancair)'s message of Sun, 13 Feb
	2000 00:54:29 -0500
Mime-Version: 1.0

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
Like many IV P builders I would like to eliminate
the pressure compensation for the aileron controls.  Don G's idea of a
split machined plastic bearing seems to be working for some
of the builders.  I woud like to try something
different and hopefully better.  My thought is to use a stiff rubber
compound to pour a custom
bearing around the torue tube.  I found a plastic
form that would give me the correct shape.  I would split the form and
quick glue it back
together around the torque tube, hold the torque tube vertical, and then
pour the rubber compound into the form.  Of course I have already place
a separating medium on the torque tube.  The new custome bearing would
then be screwed to the pressure box built around the aileron bell crank. 

I have two concerns:  1.  Is there enough 
pressure at altitude to push the bushing so
tightly around the torque tube that movement is
made more difficult?  I have in mind using a rubber similar to a
dentist's impression material
or even Proseal.  I have a lot of Proseal left
over from my last project.

2.  Will lubrication be a problem? Maybe I will
need to build in a grease fitting that leads to a
circular grove situated in the center of the bearing.

I am new to this web site so I do not know if this has been covered
before.  I would appreciate
any comments.

Hilton Head JACK


>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>