The NEWSLETTER International Hydrofoil Society P. O. Box 51, Cabin John MD 20818 USA Editor: John R. Meyer First Quarter 2008 Sailing Editor: Martin Grimm STRUCTURAL DESIGN OF AN INNOVATIVE PASSENGER VESSEL SUSTAINING MEMBERS Extract from a technical paper by Dario Boote and Donatella Mascia; Dipartimento di Ingegneria Navale e Tecnologie Marine University of Genova (Italy) he paper was presented at the 2nd International Conference on Ma- Trine Research and Transportation held in June 2007. The main features are described related to the development of an innova- tive passenger ship, starting from the concept design up to the final real- ization of the full-scale prototype. The vessel is a very unconventional solution for the employment in the short-range passenger traffic with a low environmental impact. The proposed solution has been inspired by both hydrofoil and SWATH technologies with the aim of matching rela- tively high speeds, low environmental impact and reduced wave mak- ing. The acronym for this hybrid vessel has been chosen as ENVIROALISWATH, a term which indicates all the mentioned design ____________________________ 2008 IHS DUES ARE DUE See Full Announcement on Page 2 INSIDE THIS ISSUE - President’s Column...... p.2 - Welcome New Members . p. 2 - Russian Aero-Marine.... p.4 - Boat Designer K. Horiuchi p. 5 - Rodriquez’s Messina Yard p. 6 ENVIROALISWATH General Arrangements: Longitudinal Section, Passengers and Vehicle Deck - Sailor’s Page...........p.10 See Innovative Vessel, Page 3 - Winged SES Vehicle .....p.12 PRESIDENT’S COLUMN WELCOME NEW MEMBERS Tom Haman - In 1988 Tom met Sam Bradfield In Melbourne Fla. at the To All IHS Members Florida Institute of Technology when objectives would be best served by he arrived with NF3 an 18sq sailing am pleased to report the Society’s starting with a “virtual” exhibit on the hydrofoil designed for around the Icontinued growth last year with a web. We have selected a contractor, buoy racing. Sam and Tom began total of 27 new members added to High Caliber Solutions, to open a working together on this project and the IHS Membership roles. By the new hydrofoil website linked to the he has been with Sam and HydroSail way, you can view the Membership IHS site. As we move along, we will Inc. ever since. They have built and List (a new one was generated in Jan- keep you up to date on its contents tested numerous designs from the uary, 2008) by logging onto the IHS and progress. 16ft Rave to the 37ft offshore Racer website and put in the proper pass- Those of you who download the SCAT. Today HydroSail Inc. has be- word. All IHS members have been News Letter from the website are in come HydroSail LLC, in which Tom informed of this password. If you for a special treat of additional pages is one third owner with Sam have been missed, please contact the (beyond the usual 12 in the printed Bradfield and Mike McGarry. webmaster version). This time James C. Sandison - Jim (webmaster@foils. YOUR 2008 DUES ARE DUE Doug Halsey and org). If the IHS Membership options are: Barney Black have Sandison retired as Division Direc- information is in- US$20 for 1 year, $38 for 2 collaborated on a tor, Strategic Sealift, Auxiliary correct, please send years, and $54 for 3 years. Stu- description with Oceanographic, and High Speed Lo- changes to: Steve dent membership is still only many photos of a gistics Ships, Naval Sea Systems Chorney: schorney US$10. For payment of regular unique hydrofoil Command (NAVSEA05D5). He has @comcast.net membership dues by credit sailboat called a long-term background in design, card using PAYPAL, please go construction, and testing of ships. Those of us in the “Broomstick”, a 15’ to the IHS Membership page After beginning his career in Naval Washington D.C. long, 17’ wide, at www. foils.org/member.htm Systems Engineering Command area were fortunate one-person trima- and follow the instructions. (NAVSEC) as a diving and salvage to be able to attend a ran that can be set systems engineer for the Bathyscaph Joint Meeting of the up in a variety of TRIESTE, he has been involved with IHS and the ways. I recommend most of the Navy’s Deep Submers- SNAME SD-5 Panel in January. The the article to all interested in sailing ibles, Mine Warfare ships, Oceano- subject was “HCAC (Hybrid Cata- hydrofoils. graphic ships and commercial maran Air Cushion) Development”, design-based noncombatant and high presented by Robert Moore & Ken- speed ships. He is a specialist in na- neth Maloney; Textron Marine & As your President and Newsletter Ed- val ships designed, built, and certified Land Systems. A copy of the presen- itor, I continue my plea for volunteers to commercial, U.S. Coast Guard, tation will appear on the IHS to provide articles that may be of in- and American Bureau of Ships (ABS) website, so be on the lookout for it. terest to our members and readers. requirements. He recently joined As I mentioned before, Ken Please send material and/or sugges- Maritime Applied Physics Corp. as a Spaulding is spearheading an IHS tions to me ([email protected]), Bill Senior Engineer. initiative. He has provided a brief Hockberger ([email protected]), Michael Schwartz - Mike recently write-up on the subject: “OUR HY- and Ken Spaulding ([email protected]). joined CSC-Advanced Marine Cen- DROFOIL HERITAGE” in the 2nd Wewill be pleased to hear from you. ter as Chief Engineer, and is inter- Quarter NL. In the third quarter ested in boat and craft designs Newsletter we mentioned that the John Meyer, President Board reached a conclusion that our Continued on Page 12 Page 2 IHS First Quarter 2008 INNOVATIVE VESSEL meters wide and 10.30 meters high Hull and submerged body structures (Continued From Page 1) and accommodates 450 passengers are made of AlMg 5083 light alloy; and 50 cars. foils supports and pillars are made of characteristics. [Ed Note: Also Fe5 10 steel. Atypical cross section is known as Aliswath; see related article The submerged body has a length of shown here. on page 6.] 50 m, a breadth of 4. 10 m and a depth of 2.6 m and provides 80% of the hy- The design process of this vessel has The Department of Naval Architec- drostatic buoyancy. The remaining been assessed through the develop- ture of the University of Genova co- 20% is assured, at zero speed and in ment of all those aspects falling out operated with Rodriquez Cantieri the pre-planing phase, by the two lat- from conventional ship design. They Navali to develop the complete de- eral hull bodies and, at cruise speed, mainly are represented by the re- sign of this new vessel. The paper de- by the lifting force developed by the search of the most suitable hull shape, scribes the development of the four foils. the study of the propulsion system, structural design. the analysis of the environmental im- The structure has a longitudinal The project of an innovative passen- pact and the structural layout which lay-out with web frame spacing of should comply with all previously de- ger ship with a very low wake wash, 1250 mm and longitudinal stiffener to be used in a short-range transport fined design parameters. close to the shore, has been developed The first phase of the project in cooperation between Rodriquez was devoted to the structural Cantieri Navali S.p.A of Messina and concept and geometry layout; the Department of Naval Architecture afterwards, by applying differ- of the University of Genova. ent HSC Rules, the preliminary The new vessel is characterised by scantling was laid down and high performance, good manoeuvra- improved by simplified direct bility and controllability, typical of calculations. A further refine- hydrofoils, and good sea keeping ment of the structure scantlings qualities and low installed power, has been then carried out by a typical of the SWATH solution. The finite element analysis of the investigations are aimed at realizing a hull and of the submerged body, full-scale prototype, to be built in separately modeled. Rodriquez Shipyards of Messina. ENVIROALISWATH Main Section In this paper the final part of the The vessel consists of two main com- Note: The dimension for the breadth of the structural design is presented. ponents: the hull, where cargo and lower hull is in error; it should be 4100 mm FEM models have been devel- passengers are located, and a sub- oped on the complete vessel, merged body in which the main en- spacing of 300 mm. Bottom plating is updated with all the variants gine and the fuel tanks are installed. a constant thickness, except in the suggested by stress and strain require- Hull and submerged body are con- connection to the central hull zone, ments, by taking into account the new nected together by means of two col- where it is increased. The two decks outfit layout. This investigation, the umn structures, a bigger one in the aft are fitted with two girders, one on results of which allowed the construc- part of the vessel and a very small one each side of the symmetry plane, sup- tion of the full-scale model, will be forward. ported by circular section steel pil- further improved by experimental in- lars. The submerged body maintains vestigation on the prototype. [Ed Four foils provide the dynamic lift to the longitudinal structure, with rein- Note: A complete copy of the paper sustain the vessel when running at forced frames aligned with those of is available at: http://www. cruise speed (25-27 knots).