OS 1.40 Dies at Throttle Up

[AtwoodDon at aol.com]

In a message dated 5/11/2003 10:03:21 AM Pacific Daylight Time, 
ronlock at comcast.net writes:

> Hi  all,
>   
> I have an OS 1.40 with only 15  flights on it.  Break in  and first 15  
> flights
>  over last couple of months were fine.   
>  
> Yesterday first two flights were fine. Carried plane to take off position 
> for
>  third flight, engine went rich and died at throttle up.   Re-started and
>  got same result.   Changed to new OS-F plug, and went to lighter
>  load prop.   Same result.  Set high  speed needle to near peak.
>  Same result.   Been using same jug of 15% nitro fuel for all flights.
>  Pipe is Bolly 26 inches piston face to baffel- same as first 15 flights.
>  Ive checked fuel lines, tank, remote needle, carb,  for leaks, and for
>  flow -  all seems OK.    
>  
> I discovered I  can blow air thru the pump in  the direction of fuel flow,  
> 
> but not backwards.    Anyone  know, is that normal?
>   
> Other suggestions?  -  What changed between 15th and attempt at
>  16th flight?
>   
> Thanks,   Ron Lockhart
> 

Don't know if this applies, but you might want to check your Bolly pipe to 
see if the baffle has come loose.  A friend of mine had a baffle come loose 
in his CF pipe (not Bolly) and had similar problems.  Replacing the pipe 
cured the problems........      

Don Atwood
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