Review Wing Trawling System In baldwin, alabama, united-states

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1 Votes

Wing Trawling System

Baldwin,

Alabama,United-states - 36532

Detailed description is Wing Trawling System invented by Randy Skinner to reduce fuel consumption and by-catch in the shrimp trawling industry by 50% or more.
Wing Trawling System.
Environmental Trawling Solutions.
Reducing Fuel Consumption on Shrimp Trawlers.
A report from the trawler.
“Innovation”.
Randy Skinner.
251-421-7997.
rski@bellsouth.net.
Winged Trawling System Findings.
Prepared By.
Randy Skinner.
Environmental Trawling Solutions.
This study covers the at sea findings of the use and characteristics of the winged trawling system..
1: Description of the Winged Trawling System.
The Winged Trawling System (WTS) was developed to reduce the cost of fuel consumption aboard.
commercial shrimp trawlers without losing production of catch.
The WTS omits the use of the typical.
Otter Trawl Doors when pulling shrimp trawls.
The trawl door generates the major drag factor on a.
shrimp trawler resulting in high fuel consumption.
Minor changes can be made to the typical trawler to.
allow use of the WTS..
Benefits of the WTS.
A: reduction in fuel consumption by 25% to 50% depending on vessel power and design..
B: Reduction of fish by-catch.
C: Ease of conversion from trawl doors.
D: Maintains the opening width of the net.
E: Only requires one net and one TED device per WTS.
F: Longevity of life of system.
Wooden trawl doors have to be replaced after their short life.
G: Less damage to the sea floor and fishing environment.
Menu:.
1: The otter trawl door.
pg 2.
2: The WTS pg 3.
A: Soft bottom pg 3.
B: Hard bottom pg 4.
C: Comparison between nets pg 4.
3: Vessel rigging for use of the WTS pg 5.
A: Locking WTS to the deck of vessel pg 5.
B: At sea rough conditions pg 7.
C: Dock Preparations for offloading pg 8,9.
D: Changing nets at sea pg 10,11.
E: Retrieval System of WTS aboard vessel pg 11,12.
F: At sea Calm Conditions pg 13,14.
4: Fuel consumption pg 15,16,17.
A: Vessel pg 15, main engines pg 16.
B: Hours of operation for each engine and duty pg17.
C: Comparison to trawl doors pg 17.
D: Savings Between Trawl doors and WTS on basic short trip pg 17.
E: Annual Projection of savings pg 17.
5: Net Configurations pg 17.
A: Bibs on Nets pg 17.
B: Net Adjustments pg 17, 18.
6: Recommendations For Improvement in Performance pg 19.
A: Mesh Size pg 19.
B: Net Size to WTS pg 19.
C: Net Material pg 19.
1: The Otter Trawl door.
Shown above the trawl door is used to open a trawl by using power of the trawl vessel pulling against it.
This creates an opening effect that spreads the net as the vessel moves forward.
Many trawlers pull two such pairs of trawls and doors.
Some vessels will pull two trawls with one pair of trawl doors by inserting a heavy sled or dummy door between the two nets..
For a trawler to pull two 65' trawls, four 10' trawl doors are required.
Depending on vessel power the trawls would need to be pulled at 1500 to 1600 RPM on the main engine to acquire the desired towing speed of 2.7 knots.
At this RPM most vessels pulling this equipment would burn 15-20 gals of fuel per hour.
Trawl doors will only open a net 70 to 75% of the net head rope or cork-line.
Thus the opening of the 65 ft net would actually be around 45 feet..
The trawl door also promotes the capture of unwanted by-catch.
As the photo shows the trawl door runs out ahead of the net creating a wall of mud and silt.
This creates a herding effect on fin fish swimming out ahead of the trawl.
These fish weary and are eventually captured..
2.
2: Wing Trawling System.
As shown above the WTS does not have trawl doors to open the net.
The net is always held open by the WTS and does not require power from the trawl vessel to open the net.
The only power required from the trawler is to move the net.
Since the WTS is out in front of the net with the leading edge trailing away from the center, fin fish are directed away from the net and reduces capture.
Since shrimp swim and react different to fin fish they are not affected by the wing as it passes over them..
The WTS in the photo above is 50 feet in width.
This width competes and compares with the 65 foot trawl with 10 ft trawl doors.
The biggest difference between the WTS and trawl doors is the ease of pulling through the water.
The trawler used to pull the WTS above had these numbers below in actual use in soft and hard bottom..
A: Soft mud around Main Pass of the Mississippi River with two 65 foot nets attached to two WTS.
1: Large white shrimp net with top bib floated high with floats.
2.25" # 18 twine.
Sea conditions of 3-4 feet and winds of 25-30 knots during a norther......Average of 1200 RPM on main engine created a speed of 2.8 to 3 knots.
During calm conditions RPM was lowered to 1150 for same speed..
2.
Small mesh and cut net with top bib floated high with floats.
(in photo above) 1.75" # 18 twine.
Sea conditions were 2-3 feet with winds of 15 knots or less.
Tidal conditions were very strong.
Average towing RPM was 1050 for a speed of 2.8 Knots.
Trawling with the tidal current, engine RPM would be 950 to 1000 with a forward speed of 3.2 to 3.4 Knots.
Trawling against the tidal current engine RPM would be 1050 to 1100 with the speed of 2.6 to 2.8 Knots..
3.
10 basket tow above from day of 30 knot norther.
21/25 count white shrimp using large nets.
B: Hard Bottom in the Gulf of Mexico in water 25 to 80 feet deep..
1: Large white shrimp net with top bib tied down.
2.25" # 18 twine.
Sea conditions of 3-4 feet and winds of 10 – 15 knots ......Average of 1050 RPM on main engine created a speed of 2.8 to 3 knots against the tidal current going with the tidal current engine speed was reduced to 950 RPM with a forward speed of 2.9 knots..
2: Small mesh and cut net with top bib tied down to 50 inches.
1.75" # 18 twine.
Sea conditions were 2-3 feet with winds of 15 knots or less.
Average tide.
Set engine on 1050 RPM and towed 2.8 knots in any direction.
Even though the nets were smaller same towing drag in deep water..
C: Notes of comparison between the two style of nets.
1: Larger net was no more difficult to pull than the smaller mesh net which has ½ the webbing.
2: Bib control on the top of the net makes a big difference in net drag and how hard the net works the bottom.
Pull bib forward the net works lighter.
Pull bib down and the net tows easier..
3: To catch smaller shrimp, only the tail bag of the net should be changed, not the entire net.
The way the WTS holds the net open it retains all shrimp including small.
Small mesh seems to be more of a disadvantage than an advantage..
4: The larger net with more webbing catches better than the smaller net on white shrimp.
This is also true on trawl doors with the same net.
Has not been tested on Brown shrimp..
4.
3: Vessel rigging for use of the WTS.
Basically operation of the WTS at sea is the same as with the trawl doors.
Coming to port requires a little difference in storage of the system as compared to trawl doors.
Two items have to be added and one removed from the standard trawler..
A: Locking WTS to the deck of the vessel.
Above is pictured a small rack for holding the inboard end of the WTS.
Shown in the photo are the footprints where the trawl door racks use to be welded.
The existing door racks would have been in the way of the WTS during storage.
The hinge on the WTS (fig 1) fits down over the cross mount Fig 2 then a retainer safety chain is shackled under the cross pipe..
5.
Fig 1.
Fig 2 below.
6.
B: At sea rough conditions storage..
Once WTS is locked onto the mounting rack the WTS can rest on the stern bull-work of the vessel to be secured in rough conditions..
7.
C: Dock Preparations for offloading and loading catch and cargo..
From the Rough Sea Storage position a block and tackle can be attached to the center of the WTS.
The fixed mount of the block and tackle will be on the center mast of the vessel.
Once the WTS is unsecured from its stowed position it can be lifted to a semi vertical position.
This clears the deck of the WTS..
8.
Off loading shrimp as a normal trawler..
9.
D: Changing net or doing net work at sea..
The WTS can be retrieved for ease of changing nets or clearing debris from the net.
In some cases the WTS can be brought ½ way to the vessel and rotated by hand bringing either end into the trawler vessel.
Other times it can be brought in and locked onto the bull work cap.
The same for hinging the WTS to the rack can be used on the bull work cap..
10.
Showing below the wing affixed to the bullwork cap during net change..
E: Retrieval System for bringing WTS in from the outrigger end.
This retrieval system is the exact same as already used in bringing trawl doors back to a trawler vessel with the exception of the hard mount is in a different location.
On a standard door trawler the hard mount is located on the vessel's boom just above the trawl door racks.
With the WTS the hard mount for the retrieval system has to be located directly above the stern of the vessel..
11.
This can be called a tracking mast.
It supports a heavy cable that a retrieval or decking block rides from the end of the outrigger to the top of the tracking mast.
This allows the WTS to brought into the vessel stopping anywhere along the way.
Not only can this be used for decking the WTS it can also be used to remove debris from the far reaches of the net..
Notice the center ladder on the stern with the two brace pipes going to the top of the boom..
WTS walking into the vessel.
½ way to boat.
Notice tracking cable and blocks over WTS..
12.
F: At sea calm conditions running or on anchor..
Not much different than with trawl doors.
When on anchor just as simple as double biting the net and pulling a little pressure on the wing will suffice..
13.
Depending on how much net is left to touch the water when underway or running a stabilizer block and tackle may have to be installed to the front or inside of the WTS.
Notice the yellow rope in the photo running from the underside of the center of the outrigger to the fin on the WTS.
A little pressure on this rope will prevent the forward end of the wing from dipping into the water when underway.
This connection is very simple and only needs to be done on a few occasions.
This same rope is the Sugar line that is used to retrieve the Lazy line going to the cod end of the net.
The two sugar lines are not connected between the WTS on each side of the boat.
To retrieve the Lazy line the sugar line is captured using a throw hook off each side of the vessel.
This simplifies the retrieval process during a hang up or snag of the nets..
There should not be any restrictions as to the use of stabilizers as long as deployed from the end of the outrigger..
14.
4: Fuel Consumption.
The fuel is calculated by visual site gages in the vessel.
Two thousand gallons of fuel was placed aboard the vessel and monitored until used.
A detailed written log was kept as to how the vessel burnt the fuel.
Data is below:.
A: Vessel.
Steel 80 ft double rigged trawler with twin engines 3406 Caterpillar (non electronic) 6 to 1 gear turning 60" wheels in nozzles..
15.
Main engine specs:.
16.
B: Hours of operation for each engine and duty.
1: Running free from point A to point B @ 1350 RPMS......36 hours.......18 GPH....
648 GAL.
2: 60 kw generator pulling power ..........@ 1800 RPMS....360 hours...1.5 GPH......
540 GAL.
3: Trawling time pulling 2 WTS..............@1050 RPMS......87 hours...9.3 GPH......
812 GAL.
TOTAL 2000 GAL.
C: Comparison to trawl doors..
1: Running free from point A to point B @ 1350 RPMS......36 hours.......18 GPH....
648 GAL.
2: 60 kw generator pulling power ..........@ 1800 RPMS....360 hours...1.5 GPH......
540 GAL.
3: Trawling Time Pulling Trawl doors ....@1400 RPMS......87 hours...23 GPH......
2001 GAL.
TOTAL 3189 GAL.
D: Savings between Trawl doors and WTS on basic short trip.
1: WTS 2000 Gal @ $3.15 gal........$ 6,300.00.
2: Doors 3189 Gal @ $3.15 gal.....$10,045.00.
3: WTS savings between doors......$ 3,745.00.
E: Annual Projection of savings between doors and WTS is $43.00 Per hour at 2500 hours per year.
total of $107,625.00.
5: Net Configurations.
A: Nets with a top bib on the cork line seems to be the best at performance and catch.
The bib net gives an option of working shallow water white shrimp then going offshore to fish for deepwater shrimp.
By reducing the height of the bib above the WTS the net works more like a flat net and when the distance is increased it works like a full balloon net.
The ahead and astern adjustment of the bib also changes the working or digging ride of the net on the sea floor.
The lead line can be pulled up off the bottom by pulling the bib ahead.
This is important when seaweed or unwanted bottom debris is present.
If the net needs to work harder on the seafloor the bib can be relaxed astern.
So the bib can be pulled vertical or horizontal which cannot be done with trawl doors.
Even a bib on the bottom line or lead line can be used.
This gives even another adjustment to the nets..
B: As with typical nets on trawl doors the upper cork line and lead line can be adjusted to change the workings of the net being towed.
The WTS does offer more attachment points than trawl doors..
17.
WTS with top bib on nets.
WTS with top and bottom bibs.
18.
6: Recommendations For improvement in performance.
A: Use larger size mesh nets than normal.
If a 1.75" webbing is typical used in the body of the net.
use 2" instead.
If small shrimp are targeted, change the tail bag out to a smaller mesh, not the.
entire net..
B: WTS should have a net that is 15% larger than the WTS opening..
C: The net is the greatest drag upon the towing vessel using the WTS.
If possible using a synthetic.
knotless webbing should create another 10 - 15% savings on towing fuel consumption and.
improve catch by increased speed in towing of the nets..
Parties involved in the construction and development of the Wing Trawling System.
Environmental Trawling Solutions, Inc..
Randy Skinner.
14229 County Road 13.
Fairhope, AL 36532.
251-421-7997.
rski@bellsouth.net.


Established in the recent years Wing Trawling System in baldwin , alabama in united-states.


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