The NEWSLETTER International Hydrofoil Society P. O. Box 51, Cabin John MD 20818 USA Editor: John R. Meyer Spring 2003 Sailing Editor: Martin Grimm Hybrid Trimaran Hydrofoil Spreads WHERE ARE YOU IN Its New Wings CYBERSPACE?! By William McFann IHS relies on electronic communi- cation with the membership to improve The Island Group timeliness and reduce mailing costs. If you change your email address, let us know about the change! Thank you. ests and trials of the 46’ hybrid foil-assisted trimaran developed by TechMan a/s, Norway, and built by Island Engineering, Inc 2003 DUES ARE DUE T(IEI), Maryland, USA, were successfully completed in May 2002. [Ref previous IHS Newsletters]. After demonstrations of the vessel for representatives of Navatek, Ltd, Hawaii, a program was IHS Membership is still only US$20 per calendar year (US$2.50 for started to use the trimaran as a test bed to evaluate a new variant of students). Your renewal or new member- Navatek’s proprietary lifting body technology. ship is critical. IHS accepts dues payment Navatek has been developing and testing various configurations of by personal check, bank check, money or- lifting bodies and foil systems, separately and in combination, since der or cash (all in US dollars only). We have also recently arranged for payment of regular membership dues by credit card using PAYPAL. To pay by credit card 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 Solutions ....... p.4 - Flying A Foil Manually.... p.6 - Helicopters & Hydrofoils . p. 7 - Hydrofoil Surfing ......... p. 9 Hybrid Trimaran Flying at 32 Knots - Sailor’s Page............ p.10 Continued: See Hybrid Trimaran, Page 3 - Letters To the Editor..... p.13 PRESIDENT’S COLUMN WELCOME NEW MEMBERS Michael Bosworth – Mike is currently the Ship & Force Architecture Concepts s I reported in the Winter News- At an earlier IHS Board of Directors (S&FAC) Program Manager in NAVSEA letter, the Society continues to meeting Jim King and Dennis Clark 05D1. He is a retired naval officer/engineer Agrow with new members join- had taken an action item to propose an (CDR USN (ret), retired in 1996). Prior to ing every week. During the first three approach to developing an IHS naval service, in the late sixties/early sev- months of 2003 we already had 14 long-range plan. At the meeting in enties, Mike experimented with hovercraft, new members. Many thanks to all March, Dennis presented an ap- surface effect ships and hydrofoils with a those who are spreading the word and proach, which had proved most effec- series of small experimental craft out of encouraging their colleagues to join tive for him in planning activities for Santa Barbara, CA. After a bachelor’s in the hydrofoil community. several organizations. This “bottom Naval Architecture from Naval Academy up” approach involves discussing, (1976), he served in many capacities as a Total AMV CDs delivered to date is and prioritizing certain IHS activities, Naval Officer. After naval retirement, now up to well over 200. Again many subsequently working through to de- Mike worked for half a decade at Syntek thanks to Steve Chorney who has la- sired outcomes and goals in a Technologies. In 2002, Mike rejoined the bored to copy these many CDs and two-phased approach. Clearly, as re- government as program manager of the send them all over the world. At the sources are very limited for the IHS, it multi-sponsor program (S&FAC). same time “Optimized Office Solu- makes sense to assess our “activities” Jacques Hadler - Professor Hadler has had st tions for the 21 Century” has com- and establish priorities consistent 60 years of experience in the field of naval pleted scanning thousands of pages with perceived goals for the Society. architecture and marine engineering of from a host of technical reports and Dennis will continue to develop this which about 24 years have been in acade- documents for the IHS. The subject approach with Jim King for imple- mia, 31 years at the David Taylor Model matter in these reports covers a broad mentation and discussion at the next Basin and the remainder in ship design and range of advanced Marine Vehicles. Board meeting in May. repair. Concurrently, during the last 46 So later this year the IHS will be com- years, he has served as a consulting naval ing out with a new CD: AMV-II. So architect to commercial shipbuilders, the stay tuned for the announcement and At the IHS Board meeting in March, United Nations and to foreign governments ordering instructions. However, due Ken Spaulding briefly discussed past on hydrodynamic problems concerned to the relatively higher scanning efforts to promote a traveling hydro- with ship and propeller design. For the last costs, AMV-II will be more expen- foil exhibit with the Smithsonian In- 24 years, Professor Hadler has been on the sive. Predicated on a sale of 200, a re- stitution in Washington, D.C. Martin faculty at Webb Institute of Naval Archi- view of projected costs have resulted Grimm has provided information on a tecture where he has been successively Di- in a price of $12 for IHS Members European hydrofoil exhibit contain- rector of Research, Dean of the College and $15 for non-members. ing many models, in Rostock, Ger- and, currently, J.J. Henry Professor of Na- many in 1997. Ken proposed that a val Architecture. He is recipient of the So- letter to the museum believed to have ciety of Naval Architects and Marine I regretfully report that one of our at least some of the models might be Engineers, David Taylor Medal for notable long standing Charter Member and worthwhile. However, it was decided achievements in Naval Architecture. Life Member of the IHS, Dr Edward to defer this action at this time subject Dr. Daniel H. Harris – “Rick” is a senior Sedgwick passed away in December to prioritizing the exhibit option in the engineer at Maritime Applied Physics Cor- of last year (see page 9). Also we planning effort mentioned above. poration. His work focuses on the dynam- were saddened to receive word from ics and control of high performance marine IHS Member Charlie Pieroth that a vehicles for commercial and military appli- John R. Meyer hydrofoil colleague, Ray Wright, cations. died in February (see page 12). President Continued on Page 9 Page 2 IHS Spring 2003 HYBRID TRIMARAN The original waterjet steering servos main foil configuration but at the (Continued From Page 1) were modified to steer the outboard same time, the maximum take-off dis- motors instead. placement, and hence the useful pay- 1996, with successful demonstrations load fraction, has been increased of the technology on their Midfoil and Sixty-four high-response sur- dramatically, by almost 30% as dem- Waverider test craft. Working with face-mounted pressure sensors were onstrated to date. commercial Computational Fluid Dy- installed in one of the BWB lifting namics (CFD) programs, and with as- bodies and a section of the cross-foil Ø The previously excellent sea sistance from California State to measure the pressure distribution keeping performance was improved University, Long Beach, Navatek has and boundary layer transition loca- relative to the original foil configura- developed the next evolution of lift- tions for correlation with the CFD tion due primarily to the added damp- ing body technology, the blended- predictions. Net thrust from the out- ing provided by the lifting bodies. wing-body (BWB). The main objec- board motors and the lift and drag on Ø The remarkably low tive of the BWB is to enhance the the BWB assembly are also recorded wake/wash exhibited by the original seakeeping and high-speed payload on the on-board data acquisition sys- concept does not appear to have been capacity of a range of existing or tems. changed by substitution of the BWB planned vessel designs. The IEI test The IEI Spectrum flight control sys- foil system for the original main foil. craft was determined to be the ideal tem that was already proven in the test bed on which to evaluate the per- original craft configuration was re- The large quantity of data acquired to formance of the BWB concept at a tained, although system gains were date is being reduced for correlation reasonably large scale. modified to accommodate the added with the lift, drag and pressure distri- bution predictions. The BWB, an optimized combination mass and damping associated with of two lifting bodies with a cross-foil the BWB. The Spectrum fly-by-wire between them, replaces the original digital control system maintains the [Editor’s Note: An illustration of the main lifting foil on the test craft en- trim, list, flying height and heading Hybrid Trimaran showing the instal- tirely. Requiring only three support- commanded by the operator and lation of the BWB is not available at ing struts instead of the five used with dampens transient pitch, roll, heave this time. However,an earlier concept the original foil configuration, it was and yaw motions. called Hybrid Small Waterplane Area designed by IEI to accurately reflect Results to Date Craft (HYSWAC) is based on separate the geometry of the Navatek design lifting body, amidships, and conven- yet bolt directly to the original main With the first phase of the test pro- tional aft foil on a catamaran hull (the foil foundations. The BWB also uses gram completed, the following re- former SES200). The BWB repre- the existing servomechanisms and sults have been noted: sents the first integration of the two controls for trailing-edge control flap separate lifting elements and is being Ø actuation.