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Marty, if you are burning 100LL be very careful about lead fouling on
the spark plugs and valves at that low RPM. Also, I've been told that
small Continentals lubricate and cool better at higher RPMs. I
personally cruise at 2450.
Syd
Marty Duke wrote:
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advice in this forum.]----
Hi gang,
I thought I'd try the recommended economy cruise for the C-85 on my
Coupe, what with the ever higher gas costs. I flew up to Bellingham
and topped off and flew back to here in Renton, about an hours flight
each way. I reduced power as soon as I got off the runway (both of
these are about 6000 feet long), and climbed slowly at 2300rpm. as
soon as I got up to 3500 ft. (which took some time at the reduced
setting), I cruised each way at 2100 rpm (which I checked with my new
optical rpm gizmo I just bought). My normal cruise at 2450 gets me
about 95-100 mph. At 2100 I slowed about 10mph to 85 indicated, but
only burned 3.2gph going to KBLI and 3.5gph cruising back south to
KRNT. I believe I have a 7146 prop. My normal burn rate it 4.4gph at
the higher setting. I think I figured that I went from 21.6 mpg to
25.4 mpg. For me flying is all about how long you can stay up in the
air, not about how fast you can get ! somewhe re. I suppose the tach
time runs a bit slower too at the lower setting. I used real time for
my measurements though. I was surprised at the great economy. What
kind of mileage are the rest of you getting? Another reason the Coupe
is such a great aircraft nowadays.
Marty Duke
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