International Hydrofoil Society Newsletter
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The NEWSLETTER International Hydrofoil Society P. O. Box 51, Cabin John MD 20818 USA Editor: John R. Meyer Spring-2004 Sailing Editor: Martin Grimm MDI’S CUSTOM DESIGNED WHERE ARE YOU IN CYBERSPACE?! LIFTING FOILS IHS relies on electronic communi- cation with the membership to improve [This article is a composite of material from Work Boat World (Jan timeliness and reduce mailing costs. If you are a member with email, let us know 2003), the North West Bay Ships web site, and Maritime Dynamic, your email address! Thank you. Inc.; all of whom have granted permission to use this information.] aritime Dynamics, Inc. (MDI) active lifting foil system pro- 2004 DUES ARE DUE Mvides hydrodynamic lift to reduce resistance for higher speed or lower power, and greatly reduces vessel motions for im- IHS Membership is still only proved passenger comfort. MDI’s ride control system electronics co- US$20 per calendar year (US$2.50 for ordinate the action of the foils. students). Your renewal or new member- Their system was proved on Dolphin Ulsan, a 55 meter foil assisted ship is critical. IHS accepts dues payment by personal check, bank check, money or- trimaran ferry (formerly Triumphant; see an article in the Autumn der or cash (all in US dollars only). We 2001 IHS NL, p. 5) built by North West Bay Ships, Australia have also recently arranged for payment (www.nwbs.com.au/tri.html). The current owners changed the name of regular membership dues by credit card from Triumphant to Dolphin Ulsan when they purchased it for opera- using PAYPAL. To pay by credit card tion in the Sea of Japan. please go to the IHS membership page at <http://www.foils.org/member.htm> and follow the instructions. INSIDE THIS ISSUE - President’s Column ------------ p. 2 - Welcome New Members ------ p. 2 - Propeller Design ---------------- p. 3 - Gas Turbines -------------------- p. 6 - SCAT Update ------------------- p. 8 - Waterjets ------------------------- p. 9 The Dolphin Ulsan - Fitted With MDI’s Custom Lifting Foils - Sailor’s Page -------------------- p.10 See MDI’s Lifting Foils, Page 3 PRESIDENT’S COLUMN WELCOME NEW MEMBERS Joel Billingsley – Joel became en- amored with hydrofoils when as- To All IHS Members: I therefore recommend making this signed to the Plainview AGEH-1 as small purchase of the IHS Newsletter an engineering officer. After his The Society continues to grow with 5 CD by logging onto the website: The tour with the Hydrofoil Special new members added to the Member- announcement and ordering instruc- Trials Unit, he went on to the Naval ship roles during the first 2 months of tions are on the front page about half Ship Engineering Center as a me- the new year. By the way, you can way down. It is a mere $12.00. view the Membership List by logging chanical engineer engaged in pro- onto the IHS website and put in the Martin Grimm has passed onto me an pulsion system design for high proper password. All IHS members interesting item about Rodriquez performance ships including the have been informed of this password. Canteeri Navali who recently re- PHM and a large, trans-Atlantic hy- If you have been missed or forgot, ceived a contract for 6 Foilmaster drofoil. He was instrumental in res- please contact the webmaster. It is ad- Class hydrofoils. They will be deliv- cuing the Sea Legs, an early visable for all to do this and check the ered in pairs in 2004, 2005, and 2006. experimental hydrofoil, and finding information on the List. If it is incor- Rodrique claims they can go 40 knots a home for her at the Mariners’ Mu- rect, please send changes to: Steve with 250 passengers and consume seum. This sparked a dream of one Chorney: [email protected] less than 600 litres per hour of fuel. day owning a similar craft. Martin mentions that there is an arti- Peter Cahill - Peter is the person cle in a recent issue of Work Boat with Jetfoil moldings of HMS All IHS members are reminded that World (which I have not seen) enti- Speedy 929-320 and the commer- there are many offerings on the IHS tled: “To Foil, or Not To Foil?” We cial 929-115-100. He has been website these days. You can get all will be looking for this and hopefully working on the Jetfoil model for the information about these on the obtain permission to extract from it many years and will soon be able to IHS website. A new addition to the some material for the Summer have a model fully working with offerings is a CD containing all the Newsletter. IHS Newsletters from 1978-2003. ACS. Jetfoil or PHM require the This CD contains a wealth of infor- The news about the Foilmasters is en- same type of system for control, He mation and it also has an Index pre- couraging since most of the news has now sourced the outlets for Jet- pared by Martin Grimm. With this these days seems to be about “Foil foil control and hopes to be testing index one can make a query and lo- Assisted” Catamarans, Trimarans, or soon. He feels that in the past there cate the issue(s) having the subject monohulls. I’m convinced, in my was a complete lack of knowledge matter. An example of this is the own mind, that if an operator wants to of the systems for control, but these search I was making for speeches go 40 to 50 knots consistently in systems are now available. Peter ex- made at the time of the PHM decom- rough water, “Foil Assisting” will not pects to have available molding for missioning. Martin advised by say- be satisfactory. He will require a PT50, PT75, RHS 150/160/200 and ing: “The speech by Admiral Mauz “Fully Foil-Supported” craft; PHM; complete, and ready to run. (an others) is reproduced in the Fall whether it is a monohull, catamaran Joseph Koelbel –Joe began his ca- 1993 issue of the IHS NL starting or trimaran! As a good colleague of reer in naval architecture at page 8.” Sure enough, there it was mine used to say: “What goes around, Sparkman and Stephens in 1947 with the other speeches including the Comes around”. Perhaps all the “Foil where he worked on the design of CNO’s message stating at the end: Assisted” craft will someday be con- sailboats and an experimental PT “LAND THE SHIPS”. Martin also verted to the more conventional hy- boat (PT 810). Since then he has mentioned that if one makes a query drofoil type. worked at several naval architec- on “PHM”, “you will get enough in- tural firms and has been in his own formation from past Newsletters to John Meyer write a book!”. President Continued on Page 12 Page 2 IHS Spring 2004 MDI’s LIFTING FOILS In addition to generating the neces- sulting in increased passenger (Continued From Page 1) sary dynamic lift for the hybrid ves- numbers on the route. sel, the lifting foils actively control The ride control system includes a set the heave and roll motion of the ves- Fitted with an active foil ride control of foils that lift approximately sel. system, this vessel achieves an oper- one-third of the vessel’s displacement ating speed of 40 knots with3xMTU at the 40-knot service speed. This en- Since initial delivery, MDI is retrofit- 16V 4000 M70 marine diesel engines ables the vessel to achieve its service ting a stabilizing fin aft on the center driving through Reintjes VLJ 930 speed with approximately 25% less hull, near the vessel’s centerline. The gearboxes, with Geislinger carbon fi- power than competing hull forms. vertically oriented fin is used primar- bre drive shafts and Kamewa 63 S11 ily for directional stability. water jets. The lifting foils in conjunction with a center-hull mounted trim tab, stabi- North West Bay Ships (NWBS) tri- lize vessel trim and list in addition to maran vessels have been developed An equivalent catamaran or monohull damping heave, pitch and roll mo- over an extensive design period to requires 4 engines of equal capacity tions. provide a technologically superior to achieve the same speeds, adding hull form and large platform to suit a US$550,000 to an operator’s annual full range of marine transport applica- fuel and engine maintenance costs. tions. Trimarans feature an easily driven ******** long slender center hull containing all drive train machinery. This center PURSUING PERFECTION IN PRO- hull is supported by smaller side hulls PELLER DESIGN to provide reserve buoyancy and sta- bility for the passenger platform in a (Extracts From Speed at Sea, seaway. December 2003) Lifting Foil Concept The result is a vessel authorized (un- by Doug Woodyard der DNV rules) to maintain speed in evelopments in propeller de- The system consists of an active trim significantly greater sea states than sign and. materials continue to tab aft on the center hull and lifting either similarly sized catamarans or Dtarget higher propulsive effi- foils near midships which span from monohulls. the center hull to the outer hulls. The ciency and reduced noise and vibra- trim tab controls the pitch motion of NWBS flagship trimaran fast passen- tion. the vessel while maintaining opti- ger ferry is the 55 meter Dolphin mum trim of the vessel. Ulsan, which operates a daily return Propeller efficiency is now ap- open water crossing of the Korea proaching that which is theoretically Strait, total 250 nm, between Kita possible, says Rolls-Royce. Great Kyushu, Japan and Ulsan, South Ko- strides have been made in developing rea.