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Posts posted by Zennor

  1. 7 hours ago, EYESAILOR said:

    Knots are easier to understand sailors and aircraft pilots because a nautical mile for practical purposes, is equivalent to about a minute of latitude.

    A meter on the other hand is equal to 1650763.73 wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-86 atom in a vacuum.

    I think that Slingsby would find the former easier to get his head around.

    I think originally the metre was defined as one 10 millionth part of the distance from the North Pole to the equator on a line passing through Paris.

  2. 1 hour ago, silvestert said:

    Wow. The situation is really agonizing. 
    We have seen Sodebos’ advantage vaporize in Indian Ocean, so I think they might pull the plug within next couple of hours. For sure if they will be significantly behind by the time they get to Equator. 

    Especially as the La Nina weather pattern & low SSTs in the South Eastern Pacific appears to be disrupting the winds that normally prevail in southern latitudes

  3. 18 minutes ago, bucc5062 said:

    Wind Pressure

    You can get a general idea of the pressure on a 1-foot–by–1-foot section of a structure by using the following formula: wind pressure per square foot = 0.00256 x the square of the wind speed. For example, a 40-mile-per-hour (mph) wind speed creates a pressure of (0.00256 x (40)^2) = 4.096 pounds per square foot (psf). According to this formula, a structure meant to withstand 100-mph winds must be built to resist a wind pressure of 25.6 psf. Several websites offer multifactor online calculators to determine wind pressures on standard structures.

    Physics: Force = Mass x Velocity squared

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