Glow plug failures

[Henderson,Eric]

You might be using too much after-run. I killed quite a few plugs that way. Switching to stainless bearings and using only two drops of after run (for the crank) stopped killing the center pin. Too much compression with the pure oil.

Eric.

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Anthony Romano
Sent: Wednesday, November 12, 2003 1:29 PM
To: discussion at nsrca.org
Subject: Glow plug failures




Have an Os 1.40 that has a pretty healthy appetite for glow plugs. First, 
was blowing the seal so I added a head shim and pulled out the pipe a 
little. Now the just seem to loose conductivity. Engine runs fine but go to 
restart for next flight and nobody home. Typically lifespan is about 30 
flights.
Using Type F, S&W 20% nitro 16%syn 2%castor fuel, Es pipe at 23" with Mac 2 
1/"4 header, Apc 16.5 *12W resulting in a peak setting around 8100 and a 
launch setting of 8000. Have another head shim on order and will try a 
little longer pipe if the weather ever improves. Any other suggestions?

TIA

Anthony

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