4245 HYDROGRAPHIC MANUAL PaGE 328 



Sound, and the Indian River district for the use of shore-based survey parties. The 

 boats are cheap to construct, have a shallow draft, and will carry a fair-sized party or 

 load. 



4245. Dory-Skiff 



A dory-skiff is 16 to 20 feet in length and combines some of the characteristics of a 

 dory and skiff. It is flat bottomed with straight side planking of fair sheer, a dory 

 bow, and a skiff stern. This combination gives the boat the forward riding ability of a 

 dory, but eliminates the unsteadiness; it provides a larger capacity and a convenient 

 arrangement for an outboard motor attaclmnent. 



The disadvantages are that it is heavy and difficult to handle in a wind, because the 

 bow, being higher out of the water than the stern, catches the fidl effect of the wmd and 

 tends to turn the boat broadside. This makes the boat susceptible to swamping, es- 

 pecially when landing on or takmg off from the beach in a moderate wind and swell. 

 A dory-skiff is not satisfactory for use in exposed waters where strong winds and heavy 

 swells are frequent. 



4246. Knuckle-Skiff 



A knuckle-skiff combines some of the characteristics of the dory and the skiff, and 

 is usually 16 to 18 feet in length. It is flat bottomed and has a dory bow and skift' 

 stern. The lower side planking is at a decided angle and the upper side planking is more 

 nearly vertical. There is a pronounced knuckle at the junction of the upper and lower 

 side planks. 



This boat has a moderate sheer, is fairly light in weight, and cheap to construct. 

 It has a good capacity and handles well in protected waters, such as in Southeast Alaska 

 or Puget Sound, but it is not recommended for independent use in exposed waters 

 because of its low freeboard and lack of reserve buoyancy. The boat can be backed in 

 to a rocky shore and held there long enough for men to jump ashore or aboard, because 

 the wide stern provides a good footing. 



An outboard motor may be used to advantage with this type of boat. 



4247. Dinghy 



A dinghy is a round-bottomed boat with a bar-type keel and slight sheer, and is 

 usually 12 to 16 feet in length. This type of boat is usually clinker-built, though some- 

 times it is carvel-built or smooth sided. A dinghy costs considerably more than a skiff 

 of comparable size. 



A dinghy is light in weight, well balanced, and easily handled, and is useful for the 

 transportation of small parties in protected waters. It is not satisfactory for use along 

 rocky coasts because its frail hull is easily punctured and the type of construction makes 

 repairs exceedingly difficidt. Because of this, its use should be confined to protected 

 areas with muddy or sandy shores. Outboard motors can be attached. 



Dinghies are most useful in connection with auxiliary vessels since they are easy 

 to lower, hoist, and stow, and because the working grounds are usually located m pro- 

 tected areas. On large survey ships they are rarely used by survey parties, but they are 

 useful and required as emergency boats, for use in handling lines, and in case of a man 

 overboard, etc. 



A dinghy is not intended for use in making beach landings and should not be so 

 used. The round bottom with bar keel tends to make it overturn as soon as the 

 keel touches bottom, particularly when there is any surf. 



