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John Miele

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A common question often received by France Helices is, “Why should I use a surface drive instead of a water jet for propulsion?” In fact, this is probably our most-received inquiry. So, what are the advantages and disadvantages of water jets vs. surface drives? In general, the first question we ask new customers is, “How will the vessel be used?” This question is critical, and it determines the ultimate success or failure of the project, since there are applications where water jets are preferable, and there are applications where surface drives are preferable for propulsion. Going over 35 knots consistently? Surface Drive (Jets are not as fast). Operating most often between 15 knots and 30 knots? Water Jet (Jets are more efficient in this range) Dirty water, with lots of sediment suspension and rubbish? Surface Drive. (The SDS experiences no problems with clogged... (more)

What is the difference between cavitation and electrolysis?

The following paper was presented by France Helices’ president a while back. It discusses the difference between cavitation and electrolysis and the impact of both on propellers and propulsion. These two phenomena are often confused and it is important to learn to recognize the difference between them, so that the cause of problems can be determined and adequate fixes can be made. We have translated this version from the original French version. We hope you find it interesting. Introduction I have often had the opportunity to see during my career that there was some blurring in... (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)

Two New Patrol Boat Designs from France Helices

We have just made the following designs available for sale: A 22m Patrol Boat and a 28m Patrol Boat. Take a look below and feel free to contact us with any interest. 22m Patrol Boat                                           28m Patrol Boat   Share! (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })(); Tweet Follow ... (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)