Two plugs - Neccessary?

[Bob Richards]

John,

If I'm flying in a full-scale, I like having the
redundancy of two completely separate iginition
systems. :-)

I'm not sure what you mean about two plugs making the
troubleshooting more difficult. Should be easy to
isolate.

OTOH, changing plugs on my Dad's 182 was an expensive
proposition. Back in the 80's, each plug was $12, and
there were 12 plugs. :-(  I have no idea what they
cost now. I guess if you can afford the fuel now, you
can certainly afford the plugs. The 182 holds 80
gallons!

Bob R.

--- John Ferrell <johnferrell at earthlink.net> wrote:
> Thanks for confirming my suspicions!
> The only dual ignition engines that I am aware of
> are those in highly critical applications, full
> scale airplanes and emergency services. My personal
> experience with full scale has been that the second
> spark plug only makes the troubleshooting more
> difficult. I believe the whole idea of redundant
> ignition is a concept whose time has past. There are
> twice as many things to fail. 
> 
> I knew a fellow who was preparing a van for his
> handicapped son. The law at the time required dual,
> isolated batteries. The mechanics acknowledged that
> the isolation electronics were the least reliable
> part of the van. That was many years back, I hope it
> is better now.
> 
> John Ferrell    
> http://DixieNC.US
> 

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