Page 192 - statbility for masters and mates

180 Ship Stability for Masters and Mates
In triangle OXA:
OA 12 bandangleAXO 90
In triangle ABY:
AB d and angle AYB 90
;AX 12 bsiny ; AY d cos y
or
D 12 bsiny dcosy
New draft 12 beam sin list Old draft cos list
D XY
AX AY
Note. It will usually be found convenient to calculate the draft when listed by using the triangles AOX and ABY.
Example 1
A box-shaped ship with 12 m beam is ¯oating upright at a draft of 6.7 m. Find the increase in draft if the vessel is now listed 18 degrees.
In triangle OAX:
Therefore use course 18
In triangle ABY:
Therefore use course 18
Fig. 17.2(a)
Angle AOX 18 OA (Dist.) 6:0 m
AX (Dep.) 1:85 m Angle BAY 18
AB (Dist.) 6:7 m AY (D. Lat.) 6:37 m