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Announcements
Shows and Conferences
 | Flotation
Materials: Properties, Repairs, and Standards, by
Richard Akers, IBEX (Int'l
BoatBuilders' Exhibition and Conference), Miami, Floriday, Oct.
25, 2004. Explanation of federal regulations and the ABYC standard on
flotation (H-8: Buoyancy in the Event of Swamping)—including terms,
calculations, and the theory. How to test a boat to confirm that it meets
ABYC and USCG requirements for flotation. Information about flotation foam,
including polyurethane and alternative materials. Most effective use of each
type of material, with an emphasis on the cost and benefits of each.
Download
IBEXFlotation.pdf
 | CORRECTION TO ORIGINAL IBEX '04
PRESENTATION: Ecomate™, produced by Foam Supplies, Inc., is a new non-ODP/non-GWP blowing agent.
Ecomate is a trademark of Foam Supplies, Inc. with patents pending.
Ecomate is not formic acid and is not classified as corrosive.
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| Predicting
Shock and Vibration of Planing Craft Using Time-domain Simulation, by
Richard Akers and Christopher Barry, Multi-Agency
Craft Conference, Naval Amphibious Base Little Creek, Norfolk,
Virginia, 17-19 June 2003. Using time-domain simulation (POWERSEA) to
analyze a boat hull to predict shock and vibration, and to predict motion
sickness. Included is a case study using actual data from a Gulf Coast buoy. |
Download MACC2003.pdf
Recent Publications
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Waterjet
Technology, Professional
BoatBuilder, Number 67, Oct./Nov. 2000. Maneuverable, quiet,
and fast, jet-propelled boats have multiple applications. But the hulls must
be properly designed for this type of propulsion.
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| Motion Control, Professional
BoatBuilder, Number 61, Oct./Nov. 1999. Many passengers report that they feel
seasick on the new fast ferries. Why do people get sick on these wonderful vehicles, and
what can we do about it? |
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| Predicted vs. Measured Vertical-Plane Dynamics of a Planing Boat,
FAST '99. Describes an effort to
validate the POWERSEA program using data from full-scale tests on a 25-foot, 6,400-pound
boat tested in Panama City, Florida. The boat was instrumented with accelerometers and an
inertial measurement unit and tested in both in calm water and in the wake generated by a
passing boat. The boat’s geometry and speed and the wave elevation were simulated
with POWERSEA, and the test data compared favorably with the simulated predictions.
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| Dynamic Analysis of Planing Hulls in the Vertical Plane, Society of Naval Architect and Marine Engineers
(SNAME), New England Section, April 29, 1999. The problem of predicting the
forces acting on planing vessels and the resulting motions of the vessels has resisted
analysis. An algorithm for predicting planing motion and forces based on a two-dimensional
strip theory is discussed in detail. The method has been validated against model test data
and has been found to be an accurate predictor of heave, pitch and roll position,
velocity, and to a lesser degree, acceleration. The method can be used to predict hull
panel pressures in irregular seas, and is an attractive alternative to conventional
methods of predicting planing hull bottom loading.
Download nes42999.pdf
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| Model Testing, Professional
BoatBuilder, Number 56, Dec./Jan. 1999. Tank testing is not for everyone and
every occasion. It can be expensive, but the cost of tank testing may be a small price to
pay compared to the cost of modifying a full-size vessel. (Second of Two Parts)
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| Model Testing, Professional
BoatBuilder, Number 55, Oct./Nov. 1998. You've been building boat models
since you were a kid. It's fun, and the results are gratifying. But really, can this kid's
stuff be of use to you now? (First of Two Parts)
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| Redefining the Ride, Professional
BoatBuilder, Number 49, Oct./Nov. 1997. A discussion of the Stokraft
hullform, including a sidebar on the HYSWAS (Hybrid Hydrofoil Small Waterplane Area
Ship) |
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Ship Motion Associates
