狭水路に向う船の航跡についての一考察 : 横むきの風流圧がある場合(日本航海学会第36回講演会)

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When beam wind and current are experienced the ship is drifted by them, so to proceed on the intended course, we have to revise the ship's head as much as the lee way. But it is difficult to measure correctly the lee way in no time. In this report, the author calculate the track of a ship that heads to a narrow entrance, revising the ship's head as follows: 1) the revised angle to the ship's head are φ+θ 2) φ is the measured angle of the lee way. 3) θ is the angle between the centre line of a narrow entrance and the line to the centre of the entrance from the ship's position. The θ at optional time is given as follows: [numerical formula] k_2…the speed of the ship's fore and a'ft drift θ_0…θ at the initial time. β…k_2+Vcosφ α…k_1-Vsinφ k_1…the speed of the ship's athwartship drift V…ship's speed φ…the measured angle of the lee way L…distance to the centre of the entrance from ship's position at initial time t…time from the initial time And the correct angle to be rivised for the lee way is given as follow in case of k_2=0: [numerical formula]
社団法人日本航海学会の論文
1967-07-25