"Peter Duniho" wrote in message
...
"DP" wrote in message
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[...] Sure enough, it sprayed a small amount of red hydraulic oil
on the prop and on the top cowl.

Odd. I would've assumed a 210 would have a similar prop governor design
to
other piston singles, using engine oil to control the prop.

They do. The guts of the prop use a red colored oil so you know when they
start to leak. All constant speed props do this.