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From: "Monty Roberts" <montyr2157@alltel.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2110932@logan.com>
Subject: Beware the Fire sale!!
Date: Tue, 19 Jun 2007 09:14:44 -0500
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Just thought I'd drop you guys a quick note. Last fall I purchased a "burn 
victim" Renesis. Low miles etc, etc. I pickled it with ATF and set it aside 
until I could finish my workshop.

The fire was the usual top fire that happens to rotaries. In the old 13b 
with the aluminum intake manifold, this was no problem. The fire was usually 
confined to the mass of hoses and crap on top of the motor. The Renesis, 
however, has a nylon intake. Which melts and burns in the fire. In 
hindsight, being a plastics guy, I should have known that this would be a 
problem. Nylon is one of those plastics that is very corrosive to tooling. 
You have to use stainless steel for the tool. So when the plastic burns two 
things happen, it releases corrosive gas, and it lets water from the fire 
truck into the motor. The result is a motor that is pristine on the outside, 
while the inside looks like parts off the Titanic.

So unless you get the motor for free, or the fire happened yesterday and you 
can take it apart the day after, avoid like the plague.

Good news:

You guys can benefit from my misfortune

I have development parts so that I can find out what the thickness around 
the apex seals is, how much I can port the exhaust etc.

Bad news:

I have a fairly expensive boat anchor.


Channel well marked.....

Proceed with caution!


Monty