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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
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