Glow plug failures

[Rick Wallace]

Anthony - 

Here's a long shot - it might be fuel foaming causing a lean condition in
the air?  I had that on my Elan early on  Never identified the lean
condition by sound, but had some plugs blow seals etc and plugs lasted about
as you described - a 2"x3" chunk of foam in the right place around the tank
solved the problem. 

 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
Behalf Of Rcmaster199 at aol.com
Sent: Wednesday, November 12, 2003 9:36 PM
To: discussion at nsrca.org
Subject: Re: Glow plug failures

 

In a message dated 11/12/2003 1:29:29 PM Eastern Standard Time,
anthonyr105 at hotmail.com writes:





Subj:Glow plug failures 
Date:11/12/2003 1:29:29 PM Eastern Standard Time
From:anthonyr105 at hotmail.com
Reply-to:discussion at nsrca.org
To:discussion at nsrca.org
Sent from the Internet 





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



Anthony,

The prop may be a little on the lite side for the engine, but others use so
that's probably not the main issue. I would use a different fuel and
experiment a bit. Try Kool Power or Powermaster that other fellows are using
with great success. 

My favorite is a 50:50 mix of 30% CP heli blend and 5% standard CP, and a
17x12 std APC

MattK

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