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John Miele

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Top Stories by John Miele

When France Helices quotes a surface drive system, a detailed life cycle analysis is provided to all potential customers. In other words, how much is the drive going to cost me over the long term, including maintenance, spares, and fuel efficiency? These are complicated questions with no set, “one size fits all” answer. Indeed, we have pioneered the use of specific, proprietary formulas in our software that calculate the life cycle costs and life span based on the projected variables and constraints that we are given when we are asked to quote a specific project. The nature of high speed craft makes fuel efficiency a concern. Indeed, if a vessel burns fuel at top speed at a rate that makes prolonged operations impractical, then the vessel design may not prove as useful as initially anticipated, though the top speed may be adequate or desired. As to life span of th... (more)

Advantages of SDS over Water Jets

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. ... (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)