I
TWIN COMANCHE
C/R
VMC
Vmc (Velocity minimum control) is the calibrated airspeed, determined by FAA test pilots. below
which a twin engine aircraft cannot be controlled in flight with one engine operating at take-off power and
the other engine windmilling. The Vmc which the FAA has determined for the Twin Comanche C/R is 80
mph CAS.
Calibrated airspeed is equal to the airspeed indicator reading corrected for position and instrument
error. Since calibrated airspeed and density altitude and pilot flight techniques vary, it is best, especially
when heavily loaded or on a cold day, to fly the aircraft as though Vmc were slightly higher.
Under no circumstances should the aircraft be flown below the Vmc of the aircraft with one engine
operating at maximum power and the other engine windmilling. When operating under single engine flight
conditions, either in training or in emergency situations, maintain indicated airspeed above 90 mph.
APPROACH VMC WITH CAUTiON
On take-off the aircraft should be kept either on, or near the runway, until reaching Vmc. After Vmc
has been reached the aircraft should be accelerated as rapidly as possible to the best rate of climb speed
(112 mph) if there are no obstacles ahead. if there are obstacles ahead ma$&tin the best angle of climb
speed (90 mph). The applicable speed should be maintained until all obstacles are cleared and the airplane
gains sufficient altitude.
STALLS
- STALL SPEED TABLE
(CAS)
Angle of sank
O0
2o”
40”
60”
Gear ,dr Flaps Up Gear & Flaps Down
76 70 i.
79 71
87
79 B
108 98
These f-s arc at gross weight with power
off.
WARNING
When practicing stalls maintain minimum terrain clearance of
5000 feet. Single engine or asymmetric power stalls prohibited.
Power on stalls above 2 100 RPM prohibited.
Do
not practice stalls
when carrying passengers, when the airplane is heavily loaded or
with the center of gravity near the aft limit.
As in any multiengine airplane, stall recovery in the Twin
Comanche C/R should be initiated at the first indication of a
pm-stall buffet, warning light or horn. The airplane should not be
permitted to develop into a full stall.
-
. .
I
b
OPERATING INSTRUCTIONS
ISSUED: June 1.1970
PAGE 7
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