Page 32: of Maritime Reporter Magazine (August 15, 1973)

SNAME Publishes

Translation Of German

Paper On Bow Bulbs

The use of 'bulbous hows on ships in particular trades is com- mon practice today, but the rea- sons for their use is usually not well understood. Members of Pan- el H-5 (Analytical Ship Wave

Relations) 6f The Society of Naval

Architects and Marine Engineers'

Technical and Research (T&R)

Program noted an unusually com- plete German paper 'by E. Eckert and S.D. Sharma on this subject, which clearly and simply explains the mechanism by which the bul- bous how reduces drag on full- form tankers in ballast condition.

Inasmuch as it was believed that a wider audience was justified,

SNAME has published a transla- tion in English of the original Ger- man work as T&R Bulletin 1-33, "Bow Bul'bs for Slow, Full-Form

Ships."

The bulletin compares the re- sults of a number of model tests conducted to determine an average reduction in resistance due to the addition of a bow 'bulb with full- scale operational powering data on a number of ships collected prior to their drydocking for the addition of a bow bulb, and similar data collected from the ships after their conversion. In addition, para- meters for effective bow bulk de- sign are indicated, as well as data on their sensitivity to weather con- ditions and their overall economic significance.

The second part of the paper describes a series of experiments conducted on a tanker model to identify and clarify the physical mechanism by which the addition of a bow bulb reduces the resist- ance of slow, full-form ships. In- cluded are results of measurements of resistance, viscous wake and wave pattern as well as flow ob- servations by means of film and underwater television.

T&R Bulletin 1-33, "Bow Bulbs for Slow, Full-Form Ships," was prepared for Panel H-5 (Analyti- cal Ship Wave Relations) and ap- proved by the hydrodynamics com- mittee of the Society's T&R Pro- gram. The bulletin is available through The Society of Naval Ar- chitects and Marine Engineers, 74

Trinity Place, New York, N.Y. 10006, at a price of $9 per copy.

Members of the Society may ob- tain the bulletin for $6 per copy.

This price includes postage via third class mail in the United

States and as "Printed Matter" in all other countries. Shipments will be insured and sent via air mail at extra cost only if requested.

U.S. Navy Orders 24 Fiberglass Gigs

From Uniflite Inc.

Uniflite Inc., Bellingham, Wash., has announced receipt of an $801,- 144 contract for the construction of 24 personnel boats for the U.S.

Navy.

John L. Thomas, president of

Uniflite, said delivery of the re- designed 26-foot boats will begin in January 1974. He said this con- tract boosts Uniflite's backlog of

Federal Government work to more than $4 million. Completion of this contract will bring to 144 the num- ber of 26-foot personnel boats Uni- flite has supplied the Navy.

Uniflite redesigned the hull form to provide better stability and sea- keeping characteristics and a re- duction in cost through use of modern fiberglass boatbuilding techniques.

Mr. Thomas said one prototype of the boat has been built to the new design and was delivered earl- ier this year. He pointed out that most of the boats in this new con- tract are earmarked for the Navy's new DD-963 class of destroyers currently being built in Mississippi.

Seabury McGown, Uniflite's chief engineer, said the personnel boat is used as a "captain's gig" and is capable of 21 knots with a full load of 14 passengers and two crew. He said the boat is powered by a single 250-hp engine and has a range of 100 miles at full load and power. The beam is just over 10 feet, and it has a hoist weight of 10,500 pounds and a full-load displacement of 12,500 pounds.

Uniflite is a Bellingham-based manufacturer of fiberglass boats and yachts. The company has a branch plant in Swansboro, N.C.

Employment Promotion

Service Initiated By

Personnel Services Inc.

Ray Agent, president of Person- nel Services Inc., 823 West Street,

Wilmington, Del. 19801, a profes- sional employment placement serv- ice specializing in employment re- ferral for the shoreside marine industry, announced the inaugura- tion of a new program designed to help employment seekers who don't want to 'be represented by an em- ployment agency and yet need as- sistance in presenting their quali- fications in an effective way to prospective employers.

This "Employment Promotion

Signal and

Alarm Panels

Lubrication Normal ? Fans Functioning ?

Bearings Running Hot ? Fire Watch ?

Navigation Lights All On ?

The means to monitor almost any shipboard condition is probably waiting on our shelves, though most panels are designed to meet the particular needs of an individual vessel. We have the means/ the methods and the know-how. Try us and see. enschel CORPORATION

A UNIT OF GENERAL SIGNAL

Amesbury, Massachusetts 01913.

Telephone 617 3881103

Service" includes complete resume preparation, composition of an in- dividualized cover letter and mail- ing to the appropriate executive in companies that normally utilize the individual's particular back- ground. The cost is kept at a nomi- nal amount to encourage participa- tion by those who are just starting their careers, as well as being prac- tical for the experienced profes- sional. Each promotion campaign is tailored to the person's specific situation, and personal considera- tions, such as size, type and loca- tion of the companies are given priority.

Mr. Agent explained that al- though a person is highly capable in his profession, it doesn't always follow that he has expertise in the art of 'finding a suitable position.

This program provides that exper- tise which is usually made avail- able to top management personnel by consulting firms. The program also permits the individual to uti- lize the resources of a professional employment placement service without the concern of having to pay a placement fee.

New Welding Booklet

Available From Arcair

The Arcair Company, Lancaster,

Ohio, recently announced the avail- ability of a new brochure describ- ing the company's N-5 Automatic

Metal Cutting Torch.

Fast and economical, the N-5 produces grooves from J4" to Y\ in a single pass at speeds of 60 to 20 I.P.M. respectively and is ideal for set up with automatic welding equipment . . . preparing "U" joint in one direction and au- tomatically welds on the return.

A copy of the brochure on the

N-5 Torch can be obtained 'by con- tacting the Arcair Company, P.O.

Box 407, North Memorial Drive,

Lancaster, Ohio 43130.

NYK Line Names Miura

Gen. Manager, London

NYK Line (Nippon Yusen Kai- sha) announced it has appointed

Takashi Miura as general mana- ger of its London branch office.

Mr. Miura who succeeds Y. Ya- manaka at the London post, has been serving NYK as general manager of its business division

No. 1 (liner service). Mr. Yama- naka, the former London branch general manager, has been named executive managing director of

NYK's head office.

Seatrain Lines Appoints

Capt. Jack M. Park iCapt. Jack M. Park, UISN (ret.), has been appointed to the newly created post of general manager of operations cost control by Seatrain

Lines, California, according to

Frank D. Troxel, president, at Oak- land.

Prior to his retirement from the

Navy, Captain Park had been com- manding officer of the Military

Overseas Terminal-Bay Area. 36 Maritime Reporter/Engineering News