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Tom
it's cracks in the system after many hours in flight that will be the 
problem. 1/2 an hour is nothing. Vibration and rapid heating/cooling are 
the dangers.
Graham
Tom Friedland wrote:
> Hi Bob
>  
> Thanks, I do.  30 minutes of ground running showed no CO and with my 
> cowl flap, no high temps.
>  
> Tom
>
>  
> On 11/3/06, *R.C.Harrison* <ptag.dev@tiscali.co.uk 
> <mailto:ptag.dev@tiscali.co.uk>> wrote:
>
>     Hi! Tom
>
>     I do hope you have a reliable carbon monoxide alert ? I wouldn't
>     trust a Jabiru welded muffler?
>
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