Speed Afloat, Powered by France Helices

John Miele

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Top Stories by John Miele

Last week, upon returning from a business trip, I sat down and started sorting through emails that I received while I was gone. Everybody gets them… The ones that you get on your I-phone and just quickly say, “Yeah, I’ll deal with it later” before answering the more urgent business. So, my day of reckoning arrived and I began my sorting task, when a thought occurred to me: Out of around 200 “save for later” emails from the week, at least 25 were related to upcoming conferences about the environment or controlling emissions or on emissions regulations. The thought occurred to me how little actual work I would accomplish should I actually attend each of those conferences. My entire year would be spent going here and there and accomplishing very little. I then thought, “If I, as a potential vendor or speaker, receive so many invitations, how many do my customers rece... (more)

How to Measure Pitch

We just linked to an interesting little blog, Naval Architect and His Profession. One of the postings on there was a basic “How to Measure Pitch” article that gives a very simple overview of pitch and how to visualize pitch. A propeller can be defined as follows: A mechanical device formed by two or more blades that spin around a shaft and produces a propelling force in ships/boats. There are various technical terms to define the propeller’s characteristics such as: diameter, pitch, disc area relation, hub, bore etc. All these characteristics are calculated to design the optim... (more)

Calculation information… and why we need it (Part I)

When a shipyard or naval architect contacts France Helices for the purpose of equipping a vessel with SDS, we ask for a fairly substantial amount of information, some may say excessive, about the vessel and its’ mission. Why? Well, because in order to obtain and information that has any real meaning, we simply MUST know this detail. Without it, we are merely making guesses. In the case of high speed and high performance vessels, small differences in information that may seem insignificant or irrelevant can yield big differences in the ultimate speed and applicapility to mission o... (more)

A Rational Approach to Engine and Propeller Matching for High Speed Boats

The following paper was prepared by our President, Mr. Paul Bezzi, several years ago. We hope you find it interesting and useful.   Introduction.   I am writing this paper with the aim to help those deciding on which propulsion system to select for their particular application. The majority of yachts and fast boats are targeting speeds in excess of 30 knots. For that purpose, engine manufacturers, boat-yards, and propulsion manufacturers are increasing power, behaviour at sea, and efficiency. Very shortly, problems appear due to the lack of know how; the true reason of failure... (more)

Welcome to Tier II NOX Regulations

On January 1, the MARPOL Tier II NOX regulations went into effect. From this date onward,  marine diesel engines may emit no more than  7.7~14.4.0 g/kWh of NOX, depending on rating. Tier III goes into effect on January 1, 2016, five years from now, with NOX limits of  g2.0~3.4 /kWh. Though Tier II requirements have been known for a while, very little was written about the implementation date of the regulations. Some vessels are “grandfathered” into the regulations, whereas most other must comply. Some ship owners are letting the engine maker deal with the problem, taking the op... (more)