60 to 1 Rule in Vertical Plane -Cont.

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:

1 at 1 NM = 100 feet

1 at 5 NM = 500 feet

1 at 10 NM = 1000 feet

3 at 5 NM = 1500 feet

3 at 1 NM = 300 feet

3 at 30 NM = 9000 feet

3 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):

feet

pitch change = x =

min

Example: IAS in BAC = 120 knots = 2 NM/min; 3 pitch change

2 NM

300 feet

3 = x = 600 feet/min

min

The 60to1 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

= descent gradient in feet/NM

distance

Using the relationship (1 = 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