What is Awa wind?
AWA = Apparent Wind Angle (relative to the bow, 0 to 180, starboard plus, port minus) AWD = Apparent Wind Direction (relative to true north) S = Knotmeter speed (relative to the water)
How do you calculate true wind from apparent wind?
Determining the True Wind Speed If you are using a wind meter you can estimate the true wind speed by sailing close hauled and subtracting 80% of the boat speed from the apparent wind reading of the wind meter. That will get you very close.
What’s the difference between true wind and apparent wind?
True wind speed, sometimes known as ground wind, is the actual speed of the wind as it passes over land or the surface of the sea, assuming no tidal flow. Apparent wind speed is the wind you ‘feel’ on you as you sail.
What is TWS in sailing?
Apparent wind differs in speed and direction from the true wind that is experienced by a stationary observer and composed of the true wind speed (TWS) and true wind direction (TWD) or the TWS and true wind angle (TWA) relative to the boat if it were stationary.
What is cog sailing?
COG, Course Over Ground, indicates the direction of the boat’s heading relative to the land. Over ground means “in relation to the earth”, see also the term SOG. Therefore, COG means the true direction free from the effects of sea currents.
Why is apparent wind important?
If the apparent wind moves any more forward the boat will essentially find itself in the no-sail zone and the sail will begin to luff and the boat will lose speed. So there is a limit on just how fast a boat can go relative to the wind.
What does apparent wind mean in sailing?
The wind we feel on our faces when we’re moving through the water is a combination of the air flow we feel from our own motion, plus the air flow from the true wind. We call this combined wind the apparent wind. Apparent wind is the wind the boat feels and the wind that we trim our sails to.
What does SOG stand for in sailing?
Speed Over Ground
SOG. Speed Over Ground. This differs from boat speed- so for example if your boat is stationary in the water, it may still be moving in relation to the land due to current and wind etc.
What does SOG mean in sailing?
Speed Over the Ground (SOG) is the speed of the vessel relative to the surface of the earth. Speed Through Water (STW) is the speed of the vessel relative to the water. It is possible for the STW to be zero while the SOG is 5 knots, for example if the boat was drifting in a 5 knot current.
What is a combovent power vent?
A power venter is interlocked with the appliance to ensure that proper draft is achieved before the appliance burner is activated. Patented SWG or ComboVent Power Venters are ETL and cETL listed for all LP gas, natural gas, or oil-fired heating equipment.
What is a power venter?
A power venter uses a motorized blower to vent the products of combustion. A power venter is interlocked with the appliance to ensure that proper draft is achieved before the appliance burner is activated. Patented SWG or ComboVent Power Venters are ETL and cETL listed for all LP gas, natural gas, or oil-fired heating equipment.
What is apparent wind?
Apparent wind is the wind experienced by a moving object. The apparent wind is the wind experienced by an observer in motion and is the relative velocity of the wind in relation to the observer.
What is the CFM of a power vent?
Power vents are rated in CFM—cubic feet of air moved per minute. The higher the CFM, the more powerful the vent and the more air exchanges per hour it provides. To determine the minimum CFM required, multiply the attic square footage by 0.7.