SNOWMOBILES

Page JA

- Dress warmly. Snowmobile speeds increase the chill factor in very
cold weather, making frosthite a possibility.

~- Carry snow-shoes, extra fuel,emergency rations, first aid kit, flares

a knife, and waterproof matches.

Many snowmobile operators carrv a

survival kit, spare drive belt, spark plugs, axe, tool kit, and fire

extinguishers, also.

One of the reasons for the emphasis on personal protective equip-

ment is due to the chill

factor.

This is the effect of a combination of amhient temperature and the

wind lowering the temperature to which a man is exposed.
The phenomenon was first pinned down bv the U.S.Army who devised

a wind chill index.

The index(see illustration) is a measurement of the rate of heat
loss from the body based on the number of calories lost in one hour's
exposure from a square meter of skin kent at 91.4 F (normal skin temn-
erature under windless conditions).

- Carelessness pays no dividends.

TEMP 35 30 25 2N 15 10

ALM {35 30 25 20 15 10

5 33 27 21 16

VERY COLD

2 32° -9 -15 42

WIND

CHILL INDEX

Watch out for the other guy.

5 1 -S510 -15 -2n -25 -30 <35 -40 -45
qt Dy (EQUIVALENT TEMPERATURE)—Equivalent in cooling power on exposed flesh under calm conditions

“-§ -19 -15 -20 -2 =3N0_=-35 -40 -45
“11 -15.-29>-24 -31" -35 -41 -47 -54

5 —/A

15 16 11 1 6 -11 18 =25 ~33
Pa vinlabae ai boas

29 412 3 34 -9 “1 24 -32 -4n
EXTREME COLD

25 7 Of -7 -15/-22 429 -37 -45

EXPOSED

39 5 -2 -11 -18 -26 -33 -41 -49

35 3 F4 -13 F209 F27 -35 -43 -52

a) -4 -15p-27 -29 -36 -45 -54

5 1 -6 si -24 -31 -38 -46 -54

|
9 -] 4 -24 -32 -38 -47 -56

-31 -38 -45

-40 -45 -51 -69

-46 -52 -69 -68

-52 -58 -67 -75
FLESH FREEZES

-56 -63 -79 -78
-69 -67 -72 -83
-62 -69 -76 -87
-66 -70 -78 -87

-63 -79 -79 -88

-52

-65

-76

-83

-96

~-58

~98

-191

-191

-1N3

WIND SPEEDS GREATER THAN 49 moh HAVE LITTLE ADDITIONAL

-64 -79 -77
-78 -85 -90
-88 -96 -193
-96 -1N4 -112

-191 -199 -117
-195 -113 -123
-197 -114 -)28
-198 -118 -128

-119 -120 -128

CHILLING EFFFCT.