Info

External

Internal

External

Internal

Gear efficiency, %

Commercial: 95 to 98

97 to 99

Quietness of operation

Commercial: quiet under 500 ft/min (150 m/min); noise increases with increasing pitch-line velocity

Noise level depends on quality of gear. Higher pitch line velocity (above 5000 ft/ min (1500 m/min)) requires higher precision gear. Gears operating 30,000 ft/ min (9100 m/min) have been made with overall noise level below 90 dB. Quieter than spur gears.

Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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