Chase-Durer Combat Command Automatic - Manual (Page 9)

7. Miscellaneous
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CHASE-DURER
COMBAT
COMMAND
AUTOMATIC
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FRI 31
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: