Date: Sat, 23 Apr 2005 10:27:02 -0400
From: Finn Lassen <finn.lassen@verizon.net>
Subject: Re: [FlyRotary] Re: All Parts have arrived, Whew!
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Seems like Bruce's solution of "squeezing" the grooves back to specs 
merits further investigation/description.

There is definitely contrary facts here. Stable datum used to be that 
"seals don't break unless in turbocharged applications". I wonder where 
all George's broken seal rotors came from. Turbo or non-turbo apps?

Finn

Jim Sower wrote:

> It appears I've missed something along the way here.  We've got all 
> these rotors being pitched because the apex seal slots are wallowed 
> out a little.  The replacement price seems pretty high (and likely to 
> inflate quickly when more folks start inspecting the slots of 
> replacement rotors) and one has to wonder how long the "used rotor" 
> supply will last.  What I seem to have missed is the compelling reason 
> why we can't simply mill the slots out to 3 mm, install new seals and 
> continue the march.  I know Tracy's "new formulation" seals only come 
> in 2 mm, but I speculate that would be pretty easy to change given the 
> current rash of wallowed out 2 mm slots and the potential market for 
> 3mm versions.  I've got this idea that 3 mm seals has been sort of 
> "elective surgery" and perhaps priced accordingly.  Given the 
> potential demand, it seems this could change significantly.
>
> From an engineering standpoint, what's the problem? ... Jim S.
>