Quantcast 60 to 1 Rule in Vertical Plane -Cont.

 

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T-34C INSTRUMENTS
APPENDIX C
If the distance is changed, multiply the altitude by the same factor. If the angle is changed, multiply
the altitude by the same factor. If both the distance and the angle are changed, multiply the altitude
by both factors.
Examples:
1บ at 1 NM = 100 feet
1บ at 5 NM = 500 feet
1บ at 10 NM = 1000 feet
3บ at 5 NM = 1500 feet
3บ at 1 NM = 300 feet
3บ at 30 NM = 9000 feet
3บ at 10 NM = 3000 feet
Consider the following formula when using pitch change (degrees) and airspeed (NM/min) to predict
a specific rate of climb or descent (feet/min):
NM
feet
feet
pitch change = ญญญญญ x ญญญญญ = ญญญญญ
min
NM
min
Example: IAS in BAC = 120 knots = 2 NM/min; 3บ pitch change
2 NM
300 feet
3บ = ญญญญญญญญ x ญญญญญญ = 600 feet/min
min
NM
The 60ญtoญ1 rule may be applied to determine pitch changes required during High/Low Altitude
Instrument Approaches. By computing the altitude to be lost and the distance available to lose it, the
descent gradient in feet/NM may be determined:
alt to lose
ญญญญญญญญ
= descent gradient in feet/NM
distance
Using the relationship (1บ = 100 feet at 1 NM), the following is apparent:
change in nose pitch (degree) = descent grad / 100
Keep in mind, this change in nose pitch must be applied to the level flight attitude.
ADVANCED INSTRUMENT CONCEPTS C-3


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