Chase-durer Combat Command Automatic User Manual download pdf (Page 9)

Miscellaneous

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CHASE-DURER

COMBAT

COMMAND

AUTOMATIC

9 3

FRI

At 68 F (20 C), sound travels at 344m or 376yds / 1,129ft per second in air at sea level.° °

Therefore, 68 F (20 C) sound

1 mile (1,760 yards / 5,280 feet) in

1,000 yards in

1 kilometer in

To estimate the distance to an event (such as an

explosion, muzzle flash, lightning, etc.), measure

the time from the visual flash to the sound and

multiply the seconds by the per second speed.

For example the measured lightning to thunder

time at 68 F is 10 seconds. 10 x 344m or

376yds / 1,129ft would produce 3,440m or

3,760yds / 11,290ft. (2.14miles)

Alternately, you can divide the measured time at

68 F by 4.68 to get miles (10s / 4.68 = 2.14miles),

or 2.66 for thousand yard distance, or by 2.91 for

kilometers.

at will travel:° °

4.68 seconds

2.66 seconds

2.91 seconds

Example: Sea level temp is and

lightning to thunder measured time is 18

seconds. Distance of lightning strike point

is:

18s x 1,129ft = 20,322ft

18s x 376yds = 6,768yds

18s x 344m = 6,192meters

OR:

18s / 4.68s = 3.85 miles

18s / 2.66s = 6.77 thousand yards

18s / 2.91s = 6.18 kilometers

68 F °

At 32°F (0°C), sound travels at 332m or 363yds /

1,089ft per second in air at sea level.

Therefore, at 32°F (0°C) sound will travel:

1 mile / 1,760 yards / 5,280 feet in

1,000 yards in

1 kilometer in

4.85 seconds

2.75 seconds

3.01 seconds

NOTE:

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Chase-durer Combat Command Automatic User Manual Page 9

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