Quantcast Figure 4.3-20 Speed 1

 

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SPEED
If time and distance are known, simply transfer the ratio, or proportion, information to the
DISTANCE and TIME scales of the CR-3 computer and read the unknown factor of speed
over the rate index. Use the same formula previously discussed:
SPEED
DISTANCE
=
RATE INDEX
TIME
EXAMPLE
Given:
Distance covered. . . . . 30 NM
Time flown . . . . . . . . . .11 min
Find:
Ground Speed
Solution:
1.
Estimate the answer. 11 goes into 60 approximately 6 times, so the speed is
approximately 6 x 30 or 180 kts.
Xnm =
30nm
60min
11min
2.
Locate the distance (30 NM) on the outer (DISTANCE) scale and place the time
flown (11 minutes) directly under the distance on the inner (TIME) scale. (Figure 4.3-
20)
Figure 4.3-20 Speed 1
4.6-67


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