| THE AFRICAN (FISHING) RENAYSONS |
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| Written by Shaun | |
| Wednesday, 23 July 2008 | |
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Introduction
Fuel prices have increased to unacceptable levels all over the world with crippling effect to the profit margins of even the biggest fishing companies. With the developing nations, especially Africa, being the worst off in access to financing for economic, product quality fishing solutions and job creation to combat poverty and to develop economic competency. A South African boat and sailing vessel designer – builder, Robert Schaafsma, knew way back in the early 1970’s that oil prices would cause financial chaos to the fishing industries and all fishermen and therefore built boats and vessels to overcome this threat and poverty to previously disadvantaged, poor South Africans. His solutions to contributing problems can be summarised as follows: 1. Reduce or eliminate diesel or petrol consumption by: 1.1 Design low maintenance hulls that move easily and swiftly with sufficient carrying capacity for full loads, equipment and crew for fishing trips, therefore using less or no fuel even with full loads. 1.2 Design sails and rigging specifically for ease of operation, low cost maintenance and accommodating fish handing and processing on board while the wind provides free energy using no fuel. Sail power is only often used most of the time at sea. 1.3 Design engine lay-outs for 2 or 3 diesel engines on a common gearbox – one more powerful than the other.
These are some of the boats we have built
1.3.1 The less powerful engine (low fuel consumption) is used in fair weather and whenever low cruising speeds are required or in docking. 1.3.2 The more powerful engine is used when high speeds or power is required in bad weather or sea conditions while the smaller engine is not used and is using no fuel. 1.3.3 Note that it is not necessary to use any of the engines when the wind is strong enough to be efficiently used for sailing therefore using no fuel or engine, gearbox etc wear and tear. 1.3.4 In towing, trawling or stormy conditions both engines are used to provide power to ride out the storm. 1.3.5 Down-wind in a storm or cross-winds only the small engine or big engine or none at all under sail can be used by skippers choice. 1.3.6 The small engine plus sail-power or the big engine plus sail-power or both engines plus sail-power can be used for even better fuel economy and higher speeds. 1.3.7 The small engine can be used to start the bigger one or vice versa when electronic starter or battery power fails on one engine – the small one may optionally be crank or fly-wheel started manually. 1.3.8 Special transmission design between the 2 engines and the gearbox input shaft allows one engine to run only while the other one is not working and the power take-off shaft frees automatically. 1.3.9 Each engine can optionally have an extreme variable speed design transmission to the common gearbox input shaft. 1.3.10 Both engines can optionally drive the gearbox while the variable speed drive is on the gearbox output shaft to the propeller shaft. 1.3.11 This variable speed drive allows control of propeller speeds faster or slower as with a multiple gear-shift ratio’s on land vehicles, but through all ratio’s, smoothly and instantly without disengaging the “clutch”, clutch wear or engine strain peaks. 1.3.12 More importantly the variable speed design allows the engine to be operated at a constant best-choice optimum engine speed at low revolution (less fuel and wear and tear) in the “high gear ratio’s” when higher cruising speed in fair weather/seas are required from both or any one of the engines. When more power is required, lower ratio’s can be moved into without changing engine revs until engine strain indicates need for higher rev throttle use. 1.3.13 This compensates largely for the need of a variable speed propeller and fixed lower – pitch propellers for more thrust-power and less cavitation can be fitted to cope in storms or high-thrust etc, demands because of the multiple choice, single or twin engine, high or low maximum ratio ranges of the variable speed drive options. 1.3.14 The propeller design and low propeller-drag, no engine/fuel-power sailing-mode option is designed into the stern-propeller design as for maximum boat thrust-power. 1.3.15 Many two-engined power proportions can be visualised but for ease of explanation if, say we need 300 horsepower one can use one 100 horsepower engine and one 200 horsepower engine. Use 100 horsepower or 200 horsepower or 100 horsepower + 200 horsepower = 300 horsepower outputs on a boat requiring 300 horsepower maximum. Don’t forget the optional addition of sail-power! 1.3.16 An extra engine can save a vessel and lives when one engine breaks down in dangerous situations – and then there are the sails also! 1.3.17 If each engine has its own diesel tank then running out of fuel on one engine means bleeding and priming only one engine (-a lengthy exercise when a boat drifts to destruction) while the other one moves the boat away from danger. 1.3.18 One or both engines (via the common drive transmission) can be used individually to drive generators for electricity and water heating needs equipment etc. . Increase fishing time:
Small boats like pirogues, and slow ones like dhows, Chinese junks etc, have been used for centuries for fishing under sail power only, also around African coasts. Pirogues have serious safety, capacity, power shortfalls requiring daily fishing trips over limited distances short of deep water fishing grounds with no means of preserving best quality of the catches resulting in much more time spent in cruising against the elements between port and fishing grounds/shoals than fishing in daylight hours. Dhows and junks are slow under sail and has high drag under load or bad weather/seas with no chilling of freezing of catches either. In both cases poor quality and small fish landings results which cannot compete with high quality, good profit margins of more sophisticated handling, preservation and marketing methods of the first world. Worse so poor African and other fishermen opted for outboard engine power which uses up more “petrol money” than poor catches can sell for and then runs at a loss they cannot afford. Solutions by design:
2.1 “Mother –ship” design to ship-in smaller sailing – rowing – diesel-engined fishing boats on board to take a number of smaller vessels to the fishing grounds where they can fish for days on end while the mother-ship sails lazily between them to load up their full catches so that they can carry on fishing into the emptied small boats. 2.2 The mother-vessel can be equipped with long-line and other fishing gear to fish in slow transit to fetch fish from the smaller vessels or it can drift or lie on anchor to fish if the smaller vessels are concentrated close enough to off-load their catches to the mother vessel. So all vessels are maximally occupied in actual fishing night and day. Solutions by design:
2.1 “Mother –ship” design to ship-in smaller sailing – rowing – diesel-engined fishing boats on board to take a number of smaller vessels to the fishing grounds where they can fish for days on end while the mother-ship sails lazily between them to load up their full catches so that they can carry on fishing into the emptied small boats. 2.2 The mother-vessel can be equipped with long-line and other fishing gear to fish in slow transit to fetch fish from the smaller vessels or it can drift or lie on anchor to fish if the smaller vessels are concentrated close enough to off-load their catches to the mother vessel. So all vessels are maximally occupied in actual fishing night and day. 2.3 The mother vessel has fish working apparatus for heading, gutting and filleting to reduce the fish bulk to high value sea-fresh fillets for quick compact , chilled or frozen storage while guts, heads and other offal is discarded as fish lures or bait or stored separately as animal food or fertilizer sold on landing. 2.4 The mother vessel design incorporates sleeping quarters for her own and the small vessels crew who all participate in all duties on board including processing the last catches of the day quickly before retiring. This also means 3-shift work teams for 24 hour day fishing and processing. 2.5 The mother vessel can also discharge full loads in close ports to return immediately with provisions to the small boats still actively fishing nearby. 2.6 Containers or self-contained freezer containers can be accommodated on the carrier deck also as processing storage blast-freezers to eliminate special freezing rooms built in and also make discharge and loading instant options by swapping such units on quay without labour to handle cartons. Cartons can be supplied in folded formin the empty freezercontainers going aboard. This cuts out a lot of down-time in port. 2.7 The mother vessel can be equipped for prawn trawling and freezing high value products. • The multiple engines are all situated right up in the bow of the vessel under the floor of the wheel-house, so that the skipper can immediately hear or see if a problem arises with the engines and can immediately rectify it. A complete mechanical shop is also located in the bow so that all maintenance for the “Super 5 wonder Boats” can also be serviced and repaired on-board. • The blast freezer unit can stand on the deck and all the holding cold storage will be located under the deck floor in ± 2 ton separate cold storage bins.
No1. FISHING No.3 LONG DISTANCE COASTAL CONTROL AND RESEARCH Doctors and nurses can help
The “super 5 Wonder Boat”
Food and clean drinking water
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| Last Updated ( Wednesday, 06 August 2008 ) |
Fishing Rennaisonce 











