Contrapel's Above the Water-Line Propeller System

Press Release
Tuesday, October 23, 2012

Marine propulsion research & development company, Contrapel Ltd has released details of its new propulsion system for boats – the system set to make future boats more economical, manoeuvrable, safer, stronger and better for the environment.



The high-speed propeller was invented over 170 years ago and has dominated the propulsion market ever since.  Despite 60 years of development, water-jets have struggled to make significant inroads.  



Shown to an enthusiastic marine industry for the first time at the recent Auckland On Water Boat Show, the Contrapel Hybrid Drive is about to change that.  The system is so advanced that it carries out all the functions of both propellers and water-jets with none of the drawbacks of either.  



“The Contrapel technology is a propeller system working above the waterline. Externally it resembles a traditional water-jet, however internally the method for developing thrust has much more in common with conventional propeller systems,” says Contrapel founder and Managing Director, Barry Davies.  



The Contrapel drive uses a pair of contra-rotating, fully enclosed hybrid propellers, capable of operating above the water line.  The mode of operation of the hybrid propellers is to accelerate the water from out of the intake (pick-up) duct and then discharge it through the outlet, requiring only enough backpressure downstream from the propellers to keep the system primed.  This contrasts with the traditional jet, which does not accelerate the water until further downstream in the nozzle section, which requires the generation of high pressure.  



The Contrapel Hybrid propellers produce lift in a similar way to open water propellers, by using slippage.  The use of hybrid propellers enables the mass component for each revolution be maximized and the plume velocity to be minimized. This contrasts with the low mass per impeller revolution and high-plume velocities present in conventional high-speed water-jet designs.



According to Contrapel’s own on-water tests, the higher efficiency of the new system provides the following improvements compared with boats that are equipped with traditional jet drive installations:

1) Vastly improved thrust at low and mid speeds
2) Better fuel economy at low and mid speeds due to vastly improved control.
3) Highly survivable and operable in extreme conditions, including brown and black-water environments.
4) Will lower global marine carbon footprint
5) Significantly lower noise and vibration levels
 


“Unlike the propeller however, it’s a complete solution for the entire global industry, since it’s scalable to all sizes and works equally well above or below the water line.”



The rotating speeds of the hybrid propellers are also very low, which generates low noise and little wake turbulence.  The Contrapel Hybrid Drive boasts “propeller-like” thrusts at all speeds, but unlike propellers the Contrapel Hybrid Drive propellers are enclosed in a stainless steel tube that is screened to ensure objects cannot be ingested.  This means that animal life; people and fragile seascapes are protected from damage.  



“All propeller systems are limited by virtue of the exposed nature of their rotating blades.  Outboards, stern-drives, surface piercers, shaft-drives etc. are a liability when operating in unknown and shallow waters - one strike and the craft is out of action.


Exposed propellers are a danger to civilians and trained operators in the water and are extremely vulnerable to propeller strike with objects floating under the water line or on the surface. Contrapel eliminates all of those risks and liabilities.”

Where the Contrapel Hybrid Drive also excels are the benefits over high-speed water-jets. The system has a high tolerance to wear caused by small particles in the water, equating to minimal performance loss due to damage or wear.
 


“Compared with all high-speed water-jets and propellers, expensive maintenance is considerably less.”



Currently tested in 190mm, 270mm and 330mm diameter configurations, the Contrapel Hybrid Drive is able to suit a variety of marine propulsion applications, and will work on smaller leisure craft right through to military vessels, shipping, work boats, dredging vessels and will even work for underwater submarines.



“The Contrapel Hybrid Drive system is completely scaleable and will offer entirely new ways to solve problems encountered in just about every sphere of the marine industry.”  



One of the world’s leading boat manufacturers, New Zealand’s Stabicraft Marine have been involved in the development of the Contrapel Hybrid Dive, and in conjunction with Contrapel Ltd have fitted two Contrapel 330 units to a 10.2m Supercab rescue vessel.

Powered by twin Volvo-Penta D6 435hp engines, the Stabicraft 10.2m weighs 8 tonnes and carries 750litres of fuel. It can achieve a fast cruise of 29.7 knots @ 3030rpm and reach a top speed of 37knots @ 3500rpm.

 

Maritime Reporter September 2013 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

New Products

RIMPAC Exercise Puts LCS Through Paces

It was the middle of May, and the littoral combat ship Independence was operating out of San Diego, testing components of the mine warfare mission package. The mission is one that,

Voith Schneider Propellers Drive Double-ended Ferry MS Frisia IV

Ferries operated by Norden-Frisia AG have been serving the East Frisian island of Norderney for many decades. Navigation in these coastal waters poses special

BCG Releases PCVM Emulation

Buffalo Computer Graphics (BCG) Inc. announced the addition of another emulation product to its family of Radar Simulators. BCG has completed an emulation of the VisionMaster FT radar – our PCVM.

Marine Propulsion

Wärtsilä Reshuffles Two Top Managers

The following appointments have been made in the management inform Wärtsilä Corporation: Mr Rakesh Sarin (59), B.Sc. (Eng.), has been appointed President of Power Plants,

MHI, IHI & DBJ Join Forces On Investments

Mitsubishi Heavy Industries, Ltd. (MHI), IHI Corporation and the Development Bank of Japan Inc. (DBJ) concluded a three-way formal agreement today on their respective

Voith Schneider Propellers Drive Double-ended Ferry MS Frisia IV

Ferries operated by Norden-Frisia AG have been serving the East Frisian island of Norderney for many decades. Navigation in these coastal waters poses special

Shipbuilding

RIMPAC Exercise Puts LCS Through Paces

It was the middle of May, and the littoral combat ship Independence was operating out of San Diego, testing components of the mine warfare mission package. The mission is one that,

New Superyacht ROCKIT.IT Launched by Feadship

Feadship says it has launched the outstanding 60.35-metre motoryacht ROCK.IT. Created for an experienced owner who has chartered Feadships and appreciated the essence of the brand,

FTA Approves WSF Ferry Terminal Plans

In the latest Washington State Ferries Weekly Update, Capt. George A. Capacci, Interim Assistant Secretary WSDOT/Ferries Division briefs as follows: "FTA approves

Ship Repair & Conversion

More German Shipowners Look to Gibdock for Repairs

Gibdock remarks it has continued to see its stock rise amongst the German shipowner community over the past year. Indeed the Gibraltar ship repair yard’s recent

NZ Interislander Ferry to Dry-dock in Devonport

NewZealand's KiwiRail says that the Interislander ferry Arahura has left Wellington for her scheduled bi-annual dry-docking in Devonport, having last visited Auckland in July 2012.

DoD Award Dredging, Ship Maintenance, Charter Contracts

US Department of Defense informs of placement of contracts for Chesapeake Bay dredging, dry-docking of USS Pearl Harbor, and charter of surface escort vessels. Details as follows: 1.

Fuels & Lubes

A Boost for UK Offshore Drilling? DW Monday Muses

Drilling activity offshore UK is now expected to increase over the next few years as government and industry reacts to the recommendations in Sir Ian Wood’s report

Iraqi Kurdistan Oil Shipments Reach 8.8m Barrels

Iraqi Kurdistan has shipped 8.8 million barrels of oil from the Turkish port of Ceyhan since May, Turkish Energy Minister Taner Yildiz said, as the autonomous region

Rosneft and AVTOVAZ Strengthen Strategic Cooperation

Rosneft President, Chairman of the Management Board Igor Sechin and AVTOVAZ President Bo Inge Andersson signed an Agreement of development of strategic cooperation,

Marine Power

RIMPAC Exercise Puts LCS Through Paces

It was the middle of May, and the littoral combat ship Independence was operating out of San Diego, testing components of the mine warfare mission package. The mission is one that,

Wärtsilä Reshuffles Two Top Managers

The following appointments have been made in the management inform Wärtsilä Corporation: Mr Rakesh Sarin (59), B.Sc. (Eng.), has been appointed President of Power Plants,

MHI, IHI & DBJ Join Forces On Investments

Mitsubishi Heavy Industries, Ltd. (MHI), IHI Corporation and the Development Bank of Japan Inc. (DBJ) concluded a three-way formal agreement today on their respective

Naval Architecture

ASNE to Host Launch & Recovery Symposium

The American Society of Naval Engineers (ASNE) announced that registration has opened for its Launch and Recovery Symposium 2014: Launch and Recovery of Manned

MN 100: Guido Perla & Associates, Inc.

701 5th Avenue Seattle, WA 98104 Tel: (206) 768-1515  Email: Inga.Scholz@gpai.com Website: www.gpai.com President & CEO: Guido Perla The Company: With offices in the US,

‘Naval Architecture for Non Naval Architects’ Course

From September 15-18, 2014, HMC will provide a course “Naval Architecture for Non-Naval Architects” in Singapore and Kuala Lumpur. HMC facilitated this course in cooperation with M.

 
 
Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Pipelines Ship Electronics Ship Simulators Shipbuilding / Vessel Construction
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.3353 sec (3 req/sec)