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John Miele

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Top Stories by John Miele

Emissions monitoring is a critical part of emissions control. It is required by MEPC regulations, and systems can be relatively complex. STI’s EMS was originally conceived as a modification of our gas sampling system that is used on LNGs. The EMS was developed so that multiple exhaust points could be monitored cosistently by a single system. This gives the EMS the ability to determine not only total vessel emissions, but the source of those emissions, even at the cylinder level, and the effectiveness of emissions control devices, whether manufactured by STI or a competitor. Additionally, the EMS satisfies the MEPC requirement for a CEMS system. Since the system installation can be somewhat difficult to visualize, the following link is a line diagram of a typical installation, available for download:  https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=... (more)

Propeller Blade Design and Efficiency

France Helices specializes in surface drives with our SDS. However, we began business, stretching back over 100 years, first and foremost as propeller manufacturers. The heart of the SDS is its’ propeller: Without our cutting-edge technology regarding propeller design, we would not be able to achieve the vessel speeds that our systems achieve, nor would we be able to make the performance guarantees for which our company is so well-known. In fact, this is a big advantage of the France Helices SDS over competing surface drive systems: As propeller designers and manufacturers, we ar... (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)