558 



HYDRODYNAMICS IN SHIP DESIGN 



Sec. 6S.ll 



However, the widlli of the abovewater body at 

 the hawsepipes is so narrow, as compared to the 

 width of the bulb bow under them, that a dropping 

 anchor is sure to strike the shell plating at the 

 bulb. 



It is therefore proposed that the ABC ground 

 tackle consist of: 



(a) One heavy under-the-bottom anchor, housed 

 and handled as outlined in Sec. 68.11 



(b) One abovewater bower anchor housed in a 

 centerline hawsepipe in the stem, with its flukes 

 drawn up tightly against the projecting bow, 

 above the crown and forward of the hawsepipe. 



68.11 Proposed Under-the-Bottom Anchor In- 

 stallation for Ships with Bulb Bows. Since an 

 anchor is always used under water it seems absurd 

 to hoist and carry it above water, unless possibly 



to clear turns of chain which are wrapped around 

 it accidentally. Under-the-bottom anchors were 

 installed on the famous ironclad Monitor and on 

 several British-built vessels of the 1860's. They 

 have frequently been proposed through the years 

 for ships that could not house them conveniently 

 above the water; one such was the "great mush- 

 room anchor" to be hung under the semi-globular 

 naval battery Cerberus [SNAME, 1904, Pis. 7, 

 I85]. A combination of underwater mushroom 

 anchor and abovewater stockless anchor was in 

 use for many years on U. S. submarines in the 

 early part of this century [Nimitz, C. W., USNI, 

 Dec 1912, pi. facing p. 1200]. G. de Rooij shows 

 an under-the-bottom anchor for modern sub- 

 marines ["Practical Shipbuilding," 1953, Fig. 611, 

 p. 264]. 



Fig. 68.H Proposed Housing for Mushroom Anchor in a Bow Bulb 



