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Date: Tue, 17 Jan 2006 11:16:40 -0700
From: Dale Rogers <dale.r@cox.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Hobbs (was: TCP Doesn't Work?)
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Ed Anderson wrote:

> Thanks for the feed back, Perry.  The  lead fouling is the cause of 
> our SAG, but with the stock plugs I used, I generally get 20 hours 
> before SAG starts. But, as in your case, it will continue to get worst 
> until you change spark plugs - did I ever tell you how many used spark 
> plugs I have waiting for a good lead cleaning solution? {:>).  I fly 
> mostly with 100LL and found that so long as I change the plugs ever 
> 20-25 hours no SAG, might get to 30 hours, but Tracy reported gets 
> close to 200 hours on a set of plugs using Mogas.
>
> Going to try some of this Hobbs #9 gun cleaning solution that I have 
> heard removes lead and see if I can just soak them in it and get at 
> least 40 hours off of a set.
>
> Sounds like a neat way to control the mixture on the stock auto CPU.  
> Just put a potentiometer in the circuit and  ala! a mixture control.  
> Let us know how it works out.
>
>
> Ed A


Ed,

   You might be a rather  l o n g  time finding it.  I can't find any
web reference to it.

   Now if you walk into your friendly local gun shop (including
Wal-mart and KMart) you'll find a shelf full of gun care products
from the Brunswick Corp., under the "Hoppe's" brand label.  What
you're looking for is "bore solvent". 

   I don't know if it's any advantage in our application, but there is
a relatively new variant of the Hoppe's #9 Solvent appended "plus" for
black powder shooters.  It's probably just to neutralize the
hygroscopic qualities of black powder, but #9's primary advantage over
other bore solvents was it's ability to remove copper deposited by
copper-clad bullets during their trip down the rifle bore.  Black
powder shooters use straight lead bullets.

HTH,
Dale R.                       |      (___       |
COZY MkIV-R13B #1254          |----==(___)==----|    
Mesa, AZ                            o/ | \o
Ch's 4, 5, 9, 16 & 23 in progress
http://www.canardzone.com/forum/showthread.php?t=1388
http://canardaviationforum.dmt.net/showthread.php?t=1588