Grady-White Boats Freedom 375, Руководство пользователя, Страница: 30 / 86

4-2
Chapter 4: performance
Propeller
The condition of your prop has a major influence on the performance of your boat. Your engine(s)
should be equipped with the best size prop for normal conditions. Unusual uses or weight
conditions may require special props. A damaged prop can affect your boat’s top speed, cause
vibrations, create a sudden drop in RPMs or even increase fuel consumption.
CAUTION
Stay within the engine manufacturer’s maximum and minimum RPM ranges when replacing
props. This information is located in your engine manual.
Pitch
Diameter
Diameter and pitch are the two basic dimensions of a propeller. Diameter is the distance across
the circle made by the blade tips as the propeller rotates. Pitch is the theoretical (not accounting
for slippage) forward distance the propeller would move in one revolution. An example of a
propeller dimension would be 14 X 17 for a propeller having a diameter of 14" (35.6 cm) and a
pitch of 17" (43.8 cm).
Propulsion System – Outboard
The engine manufacturer supplies all vital information concerning your engine(s) in the
Operation and Maintenance Manual(s). Details of important engine functions such as the lubrication
system, cooling system, and alarm/monitoring system are outlined in these manuals. Your
familiarization with this engine reference material will result in the proper usage and service
essential for safe and enduring engine performance. These manuals are included with the Owner’s
Packet.
DANGER
Do not inhale exhaust fumes! Exhaust contains carbon monoxide — a dangerous gas which is
potentially lethal.