The wind resistance of the boat.


Related Terms

PENDULUM ANEMOMETER

A pressure-plate anemometer consisting of a plate which is free to swing about a horizontal axis in its own plane above its center of gravity; the angular deflection of the plate is a function of the wind speed; this instrument is not used for station measurements because of the false reading which results when the frequency of the wind gusts and the natural frequency of the swinging plate coincide.

OVERWIND

To wind a spring, rope, or cable too tightly or too far.

NIPHER SHIELD

A conically shaped, copper, rain-gage shield; used to prevent the formation of vertical wind eddies in the vicinity of the mouth of the gage, thereby making the rainfall catch a representative one.

MAGNETO ANEMOMETER

A cup anemometer with its shaft mechanically coupled to a magnet; both the frequency and amplitude of the voltage generated are proportional to the wind speed, and may be indicated or recorded by suitable electrical instruments.

LOW-SPEED WIND TUNNEL

A wind tunnel that has a speed up to 300 miles (480 kilometers) per hour and the essential features of most wind tunnels.

LASER ANEMOMETER

An anemometer in which the wind being measured passes through two perpendicular laser beams, and the resulting change in velocity of one or both beams is measured.

HYPERVELOCITY WIND TUNNEL

A wind tunnel in which higher airspeeds and temperatures can be attained than in a hypersonic wind tunnel.

HOLLANDFORMULA

Aformulausedtocalculate the height of a plume formed by pollutants emitted from a stack in terms of the diameter of the stack exit, the exit velocity and heat emission rate of the stack, and the mean wind speed.

TO HAUL

To change the course of a sailing vessel to bring the wind farther forward, usually used with up, such as haul up.

HEAD WIND

Wind from ahead of the vessel

Related questions

MarineProHelp 2018 - 2020