IHS Newsletters for 2007

The NEWSLETTER International Hydrofoil Society P. O. Box 51, Cabin John MD 20818 USA Editor: John R. Meyer First Quarter 2007 Sailing Editor: Martin Grimm “SUB-CHAPTER T” WIGH SUSTAINING MEMBERS PASSENGER HYDROFOIL An Extract, by permission of ASNE, of a Paper presented at the ASNE High Speed High Performance Ships & Craft Sym- posium 2007 on January 24, 2007 in Annapolis, MD, by Michael Zauberman, Maritime Applied Physics Corporation , Dr. Jewel Barlow, University of Maryland, and Mark Rice, Maritime Applied Physics Corporation ydrofoils operating at relatively high speeds suffer from an aerody- Hnamic drag penalty that can contribute as much as 15% of the overall drag. Under funding supplied by the State of Maryland and YOUR 2007 DUES ARE DUE Maritime Applied Physics Corporation, a team of researchers looked at IHS Membership options are: hull shapes that would reduce the aerodynamic drag while providing US$20 for 1 year, $38 for 2 years, some aerodynamic lift. The resulting low-aspect-ratio, and $54 for 3 years. Student mem- thick-wing-sections provided high lift coefficients due to their proximity bership is still only US$10. For pay- to the sea surface. The paper described the Wing-In-Ground-Effect Hy- ment of regular membership dues drofoil (WIGH) concept and reviewed aerodynamic test results. The by credit card using PAYPAL, work indicated the net effect of these aerodynamic changes on the please go to the IHS Membership lift-to-drag ratios that can be achieved with a Sub-Chapter T passenger page at www.foils.org/member.htm hydrofoil. “Sub-Chapter T” applies to small passenger vessels less than and follow the instruc 100 gross tons that are allowed to carry more than 6 but less than 150 pas- tions sengers. INSIDE THIS ISSUE The WIGH vehicle shown here is fundamentally a hydrofoil that experi- - President’s Column ---------- p. 2 ences a limited amount of aerodynamic lift due - Welcome New Members ---- p. 2 to a thick hull that oper- - Round The Clock Ops ------ p. 4 ates in proximity to the water surface. The ve- - New Jet Designs -------------- p. 5 hicle operates at speeds that are potentially - Fond Memories --------------- p. 7 higher than those of a - The Nixon/Volga Story ----- p. 9 hydrofoil but not at the Rendering of the WIGH Concept - Sailor’s Page ----------------- p. 10 See WIGH Passenger Hydrofoil, Page 3 PRESIDENT’S COLUMN WELCOME NEW MEMBERS Prakash Michael Bhimsingh - Prakash is owner of a Voskhod 2, To All IHS Members NSWC CCD. I am pleased to an- built in 1989. He lives near Toronto, nounce that the presentation is now Ontario, Canada, and would like to regret to report the passing of an- available on the IHS website. Scroll other one of our fel- hear from suppliers of parts for this I down to the section about Recent Pre- vessel especially engine parts for low-Hydrofoilers, Capt. James sentations. Wilkins, of Annapolis, Maryland. Zvezda M401a diesel engine. Also Jim, at the age of 78, died of heart A reminder that the third AMV CD he will entertain offers for chartering failure on Dec. 13, 2006. He served (CD#3) has been generated by the this vessel. It is fully operational and first as Vice President, and then as Society and is available for all to or- Canadian flagged. One can contact President of the International Hydro- der thru the IHS website. As usual, him at: sailcanada@hotmail. com foil Society from 1981 to 1984. We the cost is a nominal $12 for IHS Steven Colliss – Steve started his ca- all in the IHS send our sympathies to members and $15 for non-members. reer with Vosper Thornycroft (now his wife, Betsy, his two sons and I am encouraged to report the Soci- VT Group plc UK) in 1982 in their many grandchildren. Please refer to ety’s continued growth with a total of graduate apprentice program. He JIM WILKINS REMEMBERED on 11 new members added to the IHS stayed on, and has spent most of his page 8. Membership roles just during the career working within the shipbuild- I want to remind all of you that IHS first two months of 2007. By the way, ing and marine products side of the has instituted a new option for the So- you can view the Membership List (a business. Steve is the general man- ciety’s membership dues. Now you new one was generated as of the be- ager of VT Marine Products in can sign up for $20 for 1 year, $38 for ginning of January) by logging onto Portsmouth, England, which is a sis- 2 years, and $54 for 3 years, thereby the IHS website and put in the proper ter-company to Maritime Dynamics. saving $6.00. You can do that right password. All IHS members have Steve’s technical work has been in now by going to http://www. been informed of this password. If the design and manufacture of hydrofoils.org/member.htm#pay you have been missed, please contact dynamic lifting devices of various the webmaster (webmaster@ types applied to marine platform mo- You will note that the IHS has de- foils.org). It is advisable for all to tion damping systems and lift sys- cided, at a prompt from one of our check the information on the List. If tems. Steve has held various posts members “down under”, to change it is incorrect, please send changes to: including design, business develop- the designation of the Newsletter is- Steve Chorney: schorney@ ment, and general management, and sue from seasonal (no always appro- comcast.net he spent four years working in the priate on a global basis) to First USA as the engineering manager of Quarter, Second Quarter, etc. I hope As your President and Newsletter Maritime Dynamics. that this meets with everyone’s ap- Editor, I continue my plea for volun- proval and satisfaction. teers to provide articles that may be Captain Frank G. Horn - Captain of interest to our members and read- Horn was the first hydrofoil Squad- Those of us in the Washington D.C. ers. Please send material to me ron Commodore to have six PHM area were fortunate to be able to at- ([email protected]) Bill Hock- hydrofoils under his wing. He, the tend a Joint Meeting of the IHS and berger (w.hockberger @verizon.net) Squadron personnel, and all of the the SNAME SD-5 Panel in January. and Ken Spaulding (kbs3131@ ship’s crews were eager to demon- The subject was: High Performance erols.com). We will be pleased to strate the Squadron’s ability to be a Boats & Craft for Expeditionary Pa- hear from you. reliable, powerful element of Navy trol, Riverine Warfare & Harbor Se- seapower wherever they were or- curity, by Jean-Michel Coughlin, John R. Meyer, President dered to operate. As suggested by the PMS 325G, and Gary Weaver, Continued on Page 12 Page 2 IHS First Quarter 2007 WIGH PASSENGER HYDROFOIL was chosen for its well-understood winglets act as additional lift genera- (Continued From Page 1) aerodynamics, its large cross section, tors. While in the lowered position, a flat bottom side and simplicity of the sponsons provide buoyancy to re- higher speeds of WIG vehicles. Un- construction. The sponson airfoil duce the overall draft of the vessel. like a WIG,the majority of the lift and cross section is a Clark-Y 12% thick Internally, the vessel is split into two control forces are from the WIGH’s section. The decrease in cross sec- compartments. The forward com- foils. tion was chosen to reduce weight, partment has stadium style seating make deployment mechanically sim- (left facing forward in the illustration The objective of the WIGH design is pler, and provide for to obtain aerodynamic lift from the windows in the passen- in-air hull and minimizing the aero- ger compartment. dynamic drag of the hull. The net effect is a significant (up to 10%) The hydrodynamic lift- improvement in the Lift to Drag ratio ing system is a set of of the vehicle. two T-foils with single struts. The section The improved L/D ratio translates di- chosen for both foils rectly into a reduction in propulsion was the YS-920 due to power with corresponding savings in its good cavitation fuel weight and engine weight. These characteristics. changes, in turn, reduce the structural weight etc. Small changes in aerody- The overall fully namic lift can have significant loaded weight of the WIGH Internal Layout changes in the overall performance vessel is 110,000 of the vehicle as they ripple through pounds. The forward foil carries ap- below) while the aft compartment has the design spiral. proximately 70% of the weight with regular row seating. The pilot house the aft foil carrying 30%. While a is in the forward compartment so the In the 2007 environment, fuel costs larger forward foil induces higher viewing window is situated at the have become a dominant highest point of the hull. part of high speed ferry operating costs. Toward The WIGH is only ex- this end, any savings in pected to operate in cata- fuel consumption will maran mode while in have a strong influence harbors with severe speed on the operating econom- limits. The key design ics of high-speed ferries. criteria for the sponson While the hydrofoil de- Renderings Showing WIGH Sponsons in Lowered Position design will be the transi- velopments of the 1970s drag on the aft foil, the larger strut tion from catamaran may have been driven by the search provides for better damage resis- mode to foilborne mode, which is ex- for speed in waves, the current gener- tance in the event of a collision.

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