cruise settings
 

do not wish to get into rop/lop flap, just curious what others are doing with mp/rpm/ff/rop
i normally cruise at mp = 24
rpm = 24
ff = 12gph ea.
rop = 370-390 cht
shadding usally indicates 5.8 miles per gal.
using these setting (no wind) never come close to book settings, usally only 60%.
usally around 10k, indicate 165 mph.

Rick,

Before selling my 73P, I was using essentially the same settings (a bit more MP), and getting the same fuel flow. I was 75 rop on the first cylinder to peak (always cyl 5 or 6). I have (had) intercoolers (don't want to get into this flap again either) so I was running 2" below book MP to get about 65% power. My settings were 27" and 2400 RPM, my total fuel flow was between 24 and 25 GPH. I would flight plan 25 GPH and always use a bit less. With these settings, I would get about 10 knots below book TAS (had a TAS indicator on my airplane, never seen one before I bought the airplane), about 170 kts (185 mph indicated) at 12,000'. CHT was about what you describe in warm weather, less in really cold weather.

I believe I got lower than book TAS primarily because I had boots.

Man, brings back memories. Boy I had fun flying that airplane. You that still have one, count your blessings every flight...

Kevin

settings
 

1975 P337G with intercoolers, boots and air cond. On long flight I generally set 29 to 31 inch on MP and 2450 RPM. Fuel in front engine about 12 to 12.5 gph. Fuel for back engine about 13.2 to 13.8 gpm. I see the same speed as Kevin. 170 to 180 knots. in low teens.

Jerry