Glow Plugs

[Emory Schroeter]

Hey Bill,

Not that it's any help, but I have been running the same setup you have with the same numbers (prop, pipe length and RPM) and have not been blowing plugs. I have been running Cool Power 15% and an MC carb. 

Emory

----- Original Message ----- 
  From: Bill Pritchett 
  To: discussion at nsrca.org 
  Sent: Thursday, July 08, 2004 10:27 PM
  Subject: Re: Glow Plugs


  Matt:
  I have a Greve pipe, and it's 29 1/2 to rear baffle, and 32 1/2 to end of pipe.....by all estimates, very conservative...... I use 15% nitro/16% oil Powermaster fuel, and am turning a 17x12 7900 rpm.  
  Bill

    ----- Original Message ----- 
    From: Rcmaster199 at aol.com 
    To: discussion at nsrca.org 
    Sent: Thursday, July 08, 2004 5:25 PM
    Subject: Re: Glow Plugs


    Bill, is your pipe set short? The pipe I use (Hatori) has the first deflector plate located at 23.75" from the glow plug, straight line or around 24.5" along the centerline of the header. Are you running a large enough prop to keep rpm at around 78-8000 or so? 

    I typically will run one type F plug per 150 runs in the 145, using a 20% nitro and 19% oil blend. My fuel blend is a 50:50 mix of 10%cool  power and 30% heli cool power. The large head of the Webra (large heat sink) just about requires the hot F type plug to run right. I've had limited success running other plugs in the engine.

    hope that helps you 

    MattK





      Help-
      I have to change plugs on a Webra 1.45 about every dozen flights....... I'm sure it's not a mixture problem.  The plugs are OS-F plugs...... any ideas what the cause might be??
      Thanks



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