Received-SPF: none
 receiver=logan.com; client-ip=211.29.133.168; envelope-from=lendich@optusnet.com.au
Message-ID: <00a601c50e39$3afcadd0$9e731fd3@george>
From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-720345@logan.com>
Subject: Re: [FlyRotary] PSRU - hub/prop end
Date: Wed, 9 Feb 2005 09:52:21 +1000
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

Ernest,
Timken Taper Bearings are the best there are, but I'm surprised there is
only one - there's not one on the other end of the shaft?
They are in fact overkill for this application.

The nut will be for preload, remember when you put it back on, that you know
the preload number.

Again go to a bearing supply company, I have no doubt that there would be a
standard seal to fit. Who ever made this PSRU would look for standard seal
sizes.

George ( down under)

> I have two more questions I'd like to get advice on.
>
> 1) The propeller is held on by being bolted to a NASCAR wheel hub.  The
> prop shaft passes through the hub shaft and engages the planet gear
> housing.  So basically, all  of the force pulling the aircraft along
> will pass through a single Timken taper bearing held on with a large
> nut.  The number I got off the bearing is 18690.  I know these bearings
> are extremely robust in absorbing the lateral forces of car wheel, but
> how will they hold up to the 800lbs or so of longitudinal forces from a
> propeller trying to pull the hub off its shaft?
>
> 2) Oil will be fed from the top into a gallery that runs front to back.
> Oil will feed into the back of the hub, travel through both front and
> back bearings, and return down the side of the prop shaft. Everything is
> sealed just fine, except for the front of the hub. Any ideas on how to
> accomplish this?  The prop shaft is 1.250" at the point where it needs
> to be sealed.  The only thing I've come up with so far is to machine a
> plate to go between the hub and the prop with a recess that will hold a
> seal.
>


----------------------------------------------------------------------------
----


----------------------------------------------------------------------------
----


----------------------------------------------------------------------------
----


> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>