Eddie Foy
MEMBER
South Florida
Here is the raw data. EDIT: 68 C-180H Two pilots, 1/2 fuel, 2330 lbs. CG 38.6
80 degree summer Florida day. Done from 5 to 3 thousand MSL. 88 inch Black Mac prop.
Throttle closed, Mixture rich, Propeller low pitch, Flaps up
IAS, Rate of Descent, (or altitude lost /minute, this is more accurate), Distance over ground/minute
100
90 1200 FPM
80 850 FPM
70 800 FPM
60 700 FPM
50
Throttle closed, Mixture rich, Propeller high pitch, Flaps up
IAS, Rate of Descent, (or altitude lost /minute), Distance over ground/minute
100
90 910 FPM
80 825 FPM
70 700 FPM
60 550 FPM
50
Throttle closed, Mixture idle cutoff, Propeller low pitch, Flaps up
IAS, Rate of Descent, (or altitude lost /minute), Distance over ground/minute
100
90 1300 FPM
80 1000 FPM
70 780 FPM
60 900 FPM (aircraft stalled and sinking)
50
Throttle closed, Mixture idle cutoff, Propeller high pitch, Flaps up
IAS, Rate of Descent, (or altitude lost /minute), Distance over ground/minute
100
90 1300 FPM
80 1100 FPM
70 800 FPM
60 900 FPM (again, stalled and mushing)
50
Propeller stopped, Flaps up
Could not get the prop to stop down to 50 mph in coarse or fine pitch. Weather was closing in so we stopped there.
Surprisingly, the prop pitch had little effect on a windmilling, dead engine.
Here is what the POH shows.
1968 C-180 POH
80 degree summer Florida day. Done from 5 to 3 thousand MSL. 88 inch Black Mac prop.
Throttle closed, Mixture rich, Propeller low pitch, Flaps up
IAS, Rate of Descent, (or altitude lost /minute, this is more accurate), Distance over ground/minute
100
90 1200 FPM
80 850 FPM
70 800 FPM
60 700 FPM
50
Throttle closed, Mixture rich, Propeller high pitch, Flaps up
IAS, Rate of Descent, (or altitude lost /minute), Distance over ground/minute
100
90 910 FPM
80 825 FPM
70 700 FPM
60 550 FPM
50
Throttle closed, Mixture idle cutoff, Propeller low pitch, Flaps up
IAS, Rate of Descent, (or altitude lost /minute), Distance over ground/minute
100
90 1300 FPM
80 1000 FPM
70 780 FPM
60 900 FPM (aircraft stalled and sinking)
50
Throttle closed, Mixture idle cutoff, Propeller high pitch, Flaps up
IAS, Rate of Descent, (or altitude lost /minute), Distance over ground/minute
100
90 1300 FPM
80 1100 FPM
70 800 FPM
60 900 FPM (again, stalled and mushing)
50
Propeller stopped, Flaps up
Could not get the prop to stop down to 50 mph in coarse or fine pitch. Weather was closing in so we stopped there.
Surprisingly, the prop pitch had little effect on a windmilling, dead engine.
Here is what the POH shows.
1968 C-180 POH
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