Gerassimov, Pershitz and Rakhmanin 



P , P t , P = aerodynamic force and its projections on 

 a a £ an 111 



the body axis, 



P , P ,. , P = hydrodynamic force and its projections 



" n £ ni 7 4.1. v j 



on the body axis, 



P t , P = projections of horizontal component of the 



anchor chain tension on the body axis, 



M = aerodynamic moment about the central 



vertical axis, 



M, = moment of resistance to ship's rotating 



about the central vertical axis, 



M = moment of anchor chain tension about 



the central vertical axis, 



/3 , j3 = angle between wind direction and ship's 



longitudinal axis; the amplitude value of 

 the same angle, 



fi = same angle at static equilibrium, 



£ and 17 = projections of CG velocity on the body axis, 



Y = lateral (normal to the wind) displacement 



° of CG, 



X = displacement of CG towards the wind, 



o 



X = displacement of hawse-hole towards the 



hh . , 



wind, 



Y, , = lateral displacement of hawse-hole, 



hh 



AX' = projection of absolute displacement of 



hawse-hole onto the anchor chain sag- 

 ging plane, 



ip = angle between wind direction and the 



anchor chain sagging plane, 



H = depth of sea at anchorage, 



H h 



= hawse-hole elevation over the sea bed. 

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