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Date: Sat, 18 Sep 2004 23:49:14 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Engine start
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Steve Brooks wrote:
> MessageJohn,
> Sounds like you're making progress.
> 
> Steve
>   -----Original Message-----
>   From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
> Behalf Of John Slade
>   Sent: Friday, September 17, 2004 5:28 PM
>   To: Rotary motors in aircraft
>   Subject: [FlyRotary] Engine start
> 
> 
>   Well N96PM makes noise again. It's running like .hit, but it IS running.
> 
>   The (final) starting problem was the secondary injector switch. I found
> low voltage at the secondary injectors and traced it back to the switch -
> serves me right - it was one of those mini radio shack switches. They're
> supposed to be rated for 10A, but the innards of these things are pitiful. I
> know because the switch fell apart in my hand. Two big fat DPDT switches
> later and the engine fires up right away. But I'm pretty sure its running on
> one rotor, and THAT one isn't running well - very rich, I think. The engine
> shakes more than it ever has and doesn't respond hardly at all to throttle
> changes.  Just sits and burbles at about 1600rpm.
> 
>   So, I have a bit more debugging to do, but at least it's a step forward.
>   John
> 

You may have gotten a response on this already, but those mini-switches 
at the rat shack are rated 10A !AC!.

That's a very different animal than 10A DC.  In AC current, the 
electrons sort of bounce back and forth without really going anywhere. 
In DC, they have to actually flow, and this causes a lot more stress on 
junctions.

-- 
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
   alleviated by information and experience."
                                   Veeduber