Mailing List lml@lancaironline.net Message #49673
From: Rod Pharis <rpharis@teamimc.com>
Sender: <marv@lancaironline.net>
Subject: RE: [LML] sealing aileron push rod on 4P
Date: Fri, 28 Nov 2008 15:25:02 -0500
To: <lml@lancaironline.net>
I suggest a rubber "bellows-style" diaphragm of appropriate dimensions.  It is always sealed, and there is no sliding joint ... just a flexible axial diagram, thick enough and small enough to preclude distortion from pressure differential..
 
Rod
-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net]On Behalf Of bronnenmeier@GROBSYSTEMS.COM
Sent: Tuesday, November 25, 2008 8:29 AM
To: lml@lancaironline.net
Subject: [LML] sealing aileron push rod on 4P

Dear subscribers,

 

I want to get rid of my neoprene hose around the push rods for the ailerons that keeps the cabin pressure inside.

 

I mounted my home sealing device on the flange outside of the cabin that originally clamped the neoprene hose.

 

The push rod slides on an O-ring in and out and the radial movement gets compensated by the disk that moves up and down in the housing.

 

I made all parts out of Aluminum and the push rod is stainless steel. I have it mounted, I got the wing on and it seems to work fine.

 

When I discussed my solution with a friend he made a very good point:

 

Altitude changes, condensation, freezing of condensed water

 

I am worried now that the disk could freeze up and my ailerons get stuck.

 

Do I have to worry about this since I am not going higher than probably 25,000 feet?

 

Does anyone have an advice on this?

 

Ralf Bronnenmeier

1070 Navajo Drive

Bluffton, OH 45817

Phone: (419) 369 12 33

Fax:     (419) 369 33 32

E-mail: bronnenmeier@grobsystems.com

 

Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster