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Instructional Constants
2010-03-18

Instructional Constants A number of constants have been recommended. Constants, while not the only way to fly, simplify the complexities of maneuvering an aircraft.

Throttle constant is use of palm, index finger, and feel at Full power, 2450 rpm, 1500 rpm and at 800 rpm. Set by sound check on tachometer.

Yoke constant is use of index finger, thumb, light touch, and anticipation.

Engine constants are the sound at taxi 800, run-up 1700, takeoff/climb full power, cruise 2450, slow flight 2000 and 1500 descent.

The climb constant of the C-150 is full throttle at Vy, one full trim down from neutral, 65 kts when solo and 68 kts flying dual. Set by attitude and trim check by airspeed. Hands off.

The cruise constant of the C-150 is 2450 rpm at 85 kts, and neutral trim. Set by attitude and trim, check hands off.

The power reduction constant is carb heat, 1500 rpm, hold heading and altitude. (Trim except for stalls-changed in 1991) Set by sound and feel, check by attitude and hands off.

The turn constants are 30 degree banks and 90 degree turns because they ingrain pattern turns. Hood turns are always constant rate turns.

The descent constant is carb heat, 1500 rpm, and three down trim.

The trim constant is by full turns by the button and not the pinch.

The stall constant is clearing turns before making speed reduction holding altitude and heading until application of power.

The bank/turn constant is 30 degrees bank for 90 degrees of turn.

The slow flight constant is 60 kts, three down trim and 2000 and reduce to 1500 for descent.

Minimum controllable constant is at whatever speed/power keeps the stall warner whimpering at 10 knots above stall.

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