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Date: Mon, 05 Sep 2005 10:15:27 -0500
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Another great flying day = another day of troubleshooting
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<... it was a soft/cheap hardware variety steel.  Time to get some good 
stuff ...>
I don't like the soft cold-rolled steel for anything structural.  I've 
found most bed frame rails are hot rolled and much stronger.  Easy to 
find, a bitch to cut, but very strong ... Jim S.

David Leonard wrote:

>
>
>  
>
>  
>
> Ed Wrote:
>
>
>  
>
>     Hi Dave,
>      
>     Thanks for the reports, I don't feel so lonesome {:>). 
>      
>      Regarding SAG - my analysis is that susceptibility to SAG is
>     proportional to combustion chamber pressure at ignition and the
>     condition of the plugs.  The more pressure - the harder it is for
>     the spark to jump the gap, so if your plugs are getting coated
>     with lead/carbon, I would expect to see more SAG with More
>     manifold pressure.  Tracy and I have found the same thing
>     (unturboed).  At high power setting (higher manifold pressure) the
>     problem becomes more aggravated.  Reducing throttle setting helped
>     - but, replacing (perhaps cleaning the spark plug center ceramic
>     cone) is the cure.  I must have a fortune in little-used spark
>     plugs setting around waiting for me to have nothing else to do but
>     clean spark plugs {:>).
>
>  
> Ok, that fits except for the fact that at increasing altitudes, the 
> MAP at which the SAG occurred was lower (eg. 36" at s.l. but only 26" 
> at 10k').   So something else is involved but I don't know what.  Time 
> to order more spark plugs.  :-)
>
>      
>     I only use STEEL for my alternator arm - too much vibration there
>     for aluminum (my opinion of course, but having had aluminum brake
>     line fail - I'm a little leery of the stuff {:>)).
>      
>
>  
> Yes, mine was steel too.  But it was a soft/cheap hardware variety 
> steel.  Time to get some good stuff.
>
>  
>
> Thanks for the comments.
>
> -- 
> Dave Leonard
> Turbo Rotary RV-6 N4VY
> http://members.aol.com/_ht_a/rotaryroster/index.html
> http://members.aol.com/_ht_a/vp4skydoc/index.html
>