The year was 1972.
TOR Line had ordered two remarkable passenger ferries. At the time Salen’s owned two thirds of Tor Line and its newbuilding department was set to manage the project. The two ships were designed to sail between Gothenburg, Sweden, and Felixstowe, England on a very tight schedule. One departure every day from each port was expected.
This required a speed of 26 knots, so the ships were equipped with four Pielstick 4 engines each at 8,000 horsepower to push them up to that speed.
When delivered from Flender Werft in Lubeck, Germany, they were the biggest and most powerful passenger ferries in the world.
One of our naval architects with hydrodynamics as his specialty did not believe the ships would be able to keep the schedule because a part of the route was not deep enough for the ships to maintain the required speed. This issue was discussed inside our technical department, but as we had limited experience and knowledge about these things, an alternative back-up route was defined for the new ships which added distance but offered more depth under the keel. The decision makers let it go and put it to the test.
Of course, our naval architect was right, and a simple test triggered interest. Soon after the first ship had been commissioned, we started to work on the trim. We run a garden hose along the car deck on the first ship and with some simple arrangements we were able to read what we came to call the “Dynamic Trim.”
Our simple experiment showed that the trim changed with speed and water depth in a rather complex way. So, we concluded:
• The trim could indicate when and how the depth under the keel had an impact on the speed of a ship at a constant shaft power.
• The speed of the ship varied at different trim which meant that at deep water it became possible to use dynamic trim to optimize speed.
• By including the depth and the draft of a ship in the equation the optimal dynamic trim could be calculated even more accurately.
Soon it was decided that for every ship project the new tank test program developed in the Tor Line project should be used.
At that time, we did not have any reliable means of measuring Dynamic Trim so in our tank tests (model tests) we had to refer to the Static Trim in our calculations. This worked out very well, and we made considerable fuel savings for the Salen Fleet.
In 1975, when we worked on these things, we did not have access to suitable computer technology so following completion of the tank tests of a ship we prepared diagrams for the officers onboard to work with.
This worked out very well but when Apple 1 turned up on the market with slots for additional logic cards (thanks to Steve Wozniak) we had software ready to develop a Load Calculator Instrument that could also calculate the optimal Static Trim. Developing our own logic cards we could use EPROM and make the Floppy Disc redundant.
This instrument unfortunately did not become a success; not even within the Salen companies. We continued to present the test results in a diagram form which were considered formidable. (We must remember that IBM PC was launched in 1981.)
Sven A Jansson, the man that run the garden hose on Tor Britannia was a real entrepreneur. With his nautical background he became involved in practically all trim related development already mentioned. He could not let go of the Dynamic Trim issue and he could not stop working at home in evenings, as well as his daily work.
He wanted to see an instrument that could measure the Dynamic Trim onboard a ship, and following many hours of work, he finally had a product that we came to call “the plank.” He invested in a production tool in the basement of his house in Åland and he left Salens and started his company SAJ Instruments AB in 1984. He continued to work on his favorite topics for more than 30 years. Today SAJ Instruments is a market leader within their field of technology providing top of the line fuel saving products.
Jungner Marine, a company originating from the Salen Group, started in 1983 to develop an instrument named SALFE. “FE” for “Fuel Economy.” This instrument was built around a computer board from AMD and it had a 5-inch video display and a membrane type “key board.”.
This instrument could calculate and display for example fuel consumption/nautical mile for the operator to compare the result at various trim, draft, speed and propeller power. The result from adjustment of fuel pumps and CP propeller pitch could also be optimized using this instrument.
This instrument needed a good and reliable instrument that could measure a longitudinal angle that could be recalculated to “a Ship’s Trim.” This turned out to be difficult, but one day we found the solution in a very sensitive static gyro, a spin-off product from the space industry.
The SALFE product lasted many years, and the first generation was later upgraded to work with a PC featuring a graphic display.
Leif Johansson was Sr. Project Engineer at Salenrederierna AB 1968-1980.
A massive fire broke out at the Port of Beirut on Thursday, incinerating a warehouse full of tires and oil within the port’s free zone. The same area was heavily damaged in the ammonium nitrate explosion that leveled the central port area and the adjacent waterfront on August 4. According to Lebanon’s civil defense agency, […]
Over the course of the past five days, the Australian Maritime Safety Authority arranged a medical intervention for an injured aboard a freighter in the Indian Ocean. On Saturday evening, the Spliethoff tweendecker Dolfijngracht called for assistance while under way about 1,000 nauical miles off the coast of Western Australia. A crewmember had sustained serious […]
The National Transportation Safety Board (NTSB) has released a Marine Accident Brief about an accident that occurred on April 15, 2019, involving the towing vessel DeJeanne Maria which struck the end of a submerged dredge pipeline while pushing two spud barges to the Gulf of Mexico. The incident occurred on the Mississippi River in Pass […]
Best known as a leading passenger airport serving Germany’s most populated federal state North Rhine-Westphalia, Düsseldorf has become transformed into a vital distribution point, during the COVID 19 pandemic, for medical equipment and other life-saving goods, mostly from China. Gerton Hulsman, managing director of cargo operations, reports that the handling teams are working hard to […]
DSV Belgium has solid experience in the transport of pharmaceutical products for different customers. With a pharma hub based at Brussels Airport a lot of experience and know-how has been built up over the years. Last weekend, the forwarder handled one hundred million mouth masks, an important milestone for its Belgian organisation that has put […]
The UK government’s new post-Brexit tariff regime will result in both winners and losers. The new regime is set to replace the European Union’s Common External Tariff from the end of the Brexit Transition Period on December 31, 2020. The UK’s commitment to the ongoing Brexit process and ending the UK’s transition from EU membership […]
With close to 100 daily cargo flights operated to a destination network spanning more than 65 cities across six continents, Emirates SkyCargo is delivering essential supplies and commodities to people around the world. The air cargo carrier is currently operating 11 Boeing 777 freighter aircraft, each with a capacity to transport about 100 tonnes of […]
Emirates SkyCargo has expanded its weekly scheduled cargo flight operations to cover 75 destinations across six continents. Through its wider reach, Emirates SkyCargo is able to transport essential commodities and other urgently needed cargo more rapidly across the world, allowing exporters and importers across markets to benefit from direct access to widebody cargo capacity. Some […]
Operators can continue to use pilots and other crew members who have unable to comply with certain training, recent experience, testing, and checking requirements due to the COVID-19 outbreak in support of essential operations. Additionally, this Special Federal Aviation Regulation (SFAR) provides regulatory relief to certain persons and pilot schools unable to meet duration and […]
Global commercial aviation charter company Albion Aviation Group is reporting that it is seeing a considerable uptake in its professional cargo broker training courses from the current global pandemic crisis and surge in charter demand. “We have completed a number webinar courses for a whole of host of companies, looking to manage their own cargo […]
Astral Aviation has increased its intra-African network with cargo freighters during the pandemic. While there has been a reduction in capacity to, from, and within Africa, which has been caused by a stoppage of passenger flights and limited frequencies on freighter aircraft, Astral Aviation continues to operate cargo freighters from its Nairobi hub to 13 destinations […]
The U-Freight Group (UFL), with its considerable involvement in eCommerce logistics, says that the latest statistics showing that global e-commerce sales hit $25.6 trillion in 2018 are a further vindication of its decision to enter this sector of the international freight market several years ago. The latest available estimates, up 8% from 2017, were recently […]
Callan Marine is serving as the prime contractor to the Texas Department of Transportation for a maintenance dredging project located at the Bolivar Ferry Terminal, in Galveston, Texas. Work began in May and is estimated to be complete in late July 2020. The project consists of the removal of 600,000 cubic yards of material and […]
Network Airline Management and TAAG Angola Airlines are pleased to announce the renewal of their long-term freighter aircraft contract by an additional 12 months, sealing an ongoing partnership for the foreseeable future. Operating a regular weekly scheduled service from Liege, Belgium, to the capital of Angola, Luanda, Network Airline Management provides a Boeing 747-400F aircraft […]
Qatar Airways Cargo transported 56 SkyCell containers with vaccines from one of the largest vaccine manufacturers worldwide on its scheduled freighter and belly-hold cargo flights for its customer, CEVA Logistics. The 54-tonne shipment consisting of pneumococcal and varicella vaccines were flown from Brussels to Mumbai via the carrier’s hub in Doha on two separate flights. […]
NOAA Fisheries announced Friday that it will cancel five out of its six large-scale research surveys in Alaskan waters this year due to COVID-19. The canceled surveys include the Aleutian Islands bottom trawl survey, the eastern Bering Sea bottom trawl survey, the northern Bering Sea bottom trawl survey, the Bering Sea pollock acoustics survey, and […]