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post #4784 of Old 10-23-2013
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Re: Interesting Sailboats

It is very seldom no current when sailing and since we are speaking about boatspeed differences around 0,5-1,5 knots that can easily be overtaken by the current. If boat log is not calibrated it is very difficult to compare gps and boat instrument speed to evaluate the current. And sailing back and forth to evaluate this demands absolutely 90 degrees TWA and also 90 degrees True Wave Angle and Symmetric Weed Growth - that are new therms for the instrument makers to introduce.

All these new showboats I have tested, also the Dragonfly that had already been used for a year, have had non calibrated instruments and are also often lacking enough instruments to set up SOG and GPS Speed, TWA/AWA and TWS/AWS.

Of course you can get some picture of current by observing markers etc. but still we need to be careful when talking about speeds in tests. And even if testers declare conditions and boat set up it does not help us that much since we do not know how the boat will take another 1000 kg of load, with heavier mast and lower draft.

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