Funny thing,
I was just installing a new set of spark plugs and noticed that there is a
set of installation pictures on the stock NGT spark plug..  the last
picture is a big red X through a picture of an airplane.  Specifically, we
should apparently not use these spark plugs with motor gliders or
ultralights.  So I think regular experimental airplanes should be OK.  :-)

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David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

Hi David, The Mazda engine is an automobile engine, putting it in an
experimental aircraft does not change that.  Only the FAA type certificate
can make it so.
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Murry I Rozansky