----- Original Message -----
From: "Jim Brewer" <alpha@concordnc.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, April 14, 2005 9:23 PM
Subject: [FlyRotary] Re: V shape Apex Seal Slots?


On Thu, 14 Apr 2005 16:26:19 -0500, Russell Duffy wrote:
> Apex Location Base Top
>
>
> Seal1 1.99mm 2.16 - 2.26mm Seal2
> 1.98mm 2.22 - 2.25mm Seal3
> 1.98mm 2.18 - 2.20mm Clearly the slot is larger at
> the top - is this due to design or is this due to wear? Lynn???
> Anybody? Hi Ed, I still have the brand new rotor that was
> dropped by the ceramic coaters, and I just measured the two un-
> smashed apex seal slots. I also measured the slots on the dead
> rotor that was involved in my oil out adventure. All the slots
> measure 1.89mm, with no sign of being larger at the top of the slot
> than the bottom. Cheers, Rusty (my kingdom for a decent
> contractor)


Just for the record, how did you guys measure those slots to this degree of
accuracy?
What tools were used?  Were the slots absolutely spotless?

Jim Brewer

Jim, I used $19 digital readout calipers - great tools and reasonably
accurate.  The rotor slots were reasonably clean and I did scrap the small
amount of carbon away.  In any case, if there were carbon deposites at the
top of the slots they would have resulted in a smaller not larger gap than
the bottom.

If had had to have only one "precision" measuring tool, it would be one of
those $19.00 digtal calipers.

Ed



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