Aces High Bulletin Board
General Forums => The O' Club => Topic started by: LePaul on January 12, 2008, 11:51:54 PM
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Full article and pics here: http://bangornews.com/news/t/midcoast.aspx?articleid=158849&zoneid=179
I was surprised how big this boat is...83 feet and dang fast too!
BOOTHBAY, Maine - Navy SEALs are tough guys by nature but they take a beating from their patrol boats: bruises, bumps and sore backs, even sprained ankles and chipped teeth.
An all-composite version of the aluminum Mark V patrol boat constructed by luxury boat builder Hodgdon Yachts is aimed at reducing the wear and tear on boat operators and SEALs by absorbing the impact as the vessel crashes through the waves at 50 knots and more.
The goal is to deliver Navy SEALs in shape to carry out their missions and to reduce the long-term neck, back and joint injuries inflicted on operators.
"The idea is to build a boat out of the best carbon-Kevlar composite that we can build to reduce those slamming forces," said David Packhem Jr., president and chief executive officer of Maine Marine Manufacturing, a military spinoff of Hodgdon Yachts.
The 83-foot research prototype unveiled Friday looks similar to the current patrol boats, but it has a new hull made from the advanced composite materials.
Hodgdon Yachts worked on the project with the University of Maine’s Advanced Engineered Wood Composites Center.
The prototype developed for the Office of Naval Research and the Special Operations Command was created using multiple layers of carbon with a foam core and an outer layer of Kevlar for additional strength, Packhem said.
Though it’s designed to reduce slamming forces, the prototype is actually 50 percent stronger — and slightly lighter — than the aluminum version. Packhem thinks even more weight can be eliminated without sacrificing performance.
"This extraordinary boat is going to be of extraordinary value to the Navy and to our SEALs," said Sen. Susan Collins, who christened the vessel with a bottle of champagne during Friday’s ceremony.
Maine’s congressional delegation secured $14 million for the project through a series of earmarks over several years. If the prototype is successful, the Navy could end up buying $200 million worth of the patrol boats from the Maine shipyard, Collins said.
The original Mark V, known in military parlance as the MK V Special Operations Craft, was created in the mid-1990s to get special operations forces, primarily SEAL combat swimmers, in and out of messy situations quickly.
And the vessel is indeed quick: Powered by a pair of diesel engines, the twin waterjets propel the vessel to a top speed of about 60 mph.
The problem is that the operators and up to 16 combat-ready SEALs take a beating, literally, as the boat skips through the water.
The aluminum hull is stiff and lightweight, but the ocean’s force is transmitted to the occupants in bone-jarring fashion.
Fighter jet pilots are subjected to forces up to 10 times the pull of gravity, but the Mark V has produced forces of 20 Gs slamming against waves, said Lt. Damon Shearer, senior medical officer of Naval Special Warfare Group 4.
Soon after the vessel went into service, the Navy began getting reports of injuries. It responded by installing shock-absorbing seats.
While that helped, there continues to be a problem with back, neck and joint injuries that occur over time, Shearer said in a telephone interview. Furthermore, by the time they arrive for their mission SEALs are sometimes weary from the beating, he said.
Navy Commodore Evin H. Thompson, commander of Naval Special Warfare Group 4 in Norfolk, Va., who attended the ceremony in Maine, said he hopes the new vessel dubbed the Mark V.1 will build upon the lessons learned at sea with the original vessel.
"We’ve learned along the way about the power of the sea," Thompson said. "The sea can be cruel."
Other speakers at Friday’s launch included U.S. Rep. Tom Allen, Maine Economic and Community Development Commissioner John Richardson, University of Maine President Robert Kennedy, Office of Naval Research John Pazik and Hodgdon Yacht President Tim Hodgdon.
Richardson said the timing was ironic, coming on the heels of the closing of the Brunswick Naval Air Station.
"This is an illustration of the can-do philosophy of Maine people," he added. "When one door closes, another door opens up."
Allen called the boat a new beginning, combining Maine’s 200-year boat building tradition and "entrepreneurs like Tim [Hodgdon]."
"This is a partnership squared," he said of the entities involved.
Dubbed Mako, for the shark that frequents the Gulf of Maine, the vessel will undergo shipbuilder testing this month in Maine’s coastal waters before traveling to Norfolk, Va., for further evaluation by the Navy.
If it performs as expected, it could be deployed within two to three years, Thompson said.
The Navy wants to move quickly because the patrol boat plays an important role in the war on terrorism. The original Mark V deployed SEALs to Iraqi oil platforms to protect them at the opening of the Iraq war, he noted.
BDN writer George Chappell contributed to this report.
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Hogdon has always been known for building very high quality small hulls, expensive though.
I think they would be better off moving the dies off shore.
shamus
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Very cool.:cool:
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I wonder why they don't put the cabin further back in the boat as that would reduce the slamming effect by a great deal.
Anyone who has ever been in a high speed boat knows that if you want to get thrown in the air, go to the front part of the boat.
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Too far back and they are in the way of hte Zodiac/inflatable they commonly use. If you see the Mark V, the rear is ramped so they can basically drive into the boat and zip out of harms way
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Why not put benches with good suspension..
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If they think changing the material of the boat is going to affect the jarring shock of smashing through waves, they are sorely mistaken.
Heres a better solution: Mouth guards, padded interior walls, and having everyone stand (the legs are excellent shock absorbers).
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The Mk V's currently in service have hydrolicly dampened seats for the crew and passengers but in anything above a sea state 2 it's still a very rough ride. This new hull design might actualy help some. Standing is a bad idea as a person is more prone to injury that way.
From 1999 to 2002 I worked with the Coast Guards Deployable Pursuit Boat program and during that time we often worked with the Navy's Special Boat Unit out of Little Creek. I've gotten to ride in the 11 meter RHIB's and the Mk V's on several occasions, and just like the 38ft Fountains we were using, the faster you go in a boat the worse the ride gets if you have any sort of sea state. Our boats we had to stand in and I have trouble with my knees and back now from it. One of our guys damaged one of his kidneys from a heavy hit one time and had to have surgery. Standing up in a fast boat is the last thing you want to do if you can avoid it.
Here is one of the boats I worked on. I'm in the back seat.
(http://www.uscg.mil/hq/g-cp/cb/JAN00/Images/dpb1.GIF)
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When I was doing my time with the coastal surveillance the coast guard got new inflatable speedboats. They had suspensioned seats etc. When they took the boats to test drive, on a normal weather with light waves one of the coastguards lost grip on his seat and returned with a broken leg.
Those things are nasty at high speed. I took a couple rides with the finnish army transport 'meriuisko' which is a waterjet propelled troop transport capable of doing 40-50 knots.
(http://www.mil.fi/maavoimat/kalustoesittely/pics/sivu143.jpg)
Only the driver had a seat with suspension and every time we travelled, we were looking at that seat with great envy, getting bruised up in the ride. :) It was even worse in the front where you had to go to open space if a full team was aboard. It was fun like a roller coaster for a few seconds, but after a while you wanted to leave.
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Originally posted by AquaShrimp
If they think changing the material of the boat is going to affect the jarring shock of smashing through waves, they are sorely mistaken.
Now think about it for a sec. They are going from a hard hull to a hull that will absorb some of the impact. It would be like driving a car with a solid metal wheel or an inflatable tire. The hull will give and flex taking some of the punishment.
I don't think they expect a Cadillac ride, but something less punishing than they are getting now. The only way to get a smooth ride would be some sort of hovercraft or hydroplane.
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Originally posted by AquaShrimp
If they think changing the material of the boat is going to affect the jarring shock of smashing through waves, they are sorely mistaken.
Heres a better solution: Mouth guards, padded interior walls, and having everyone stand (the legs are excellent shock absorbers).
Ask an old lobsterman what rides better. A wood hull or a steel hull.
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lobster boats don't go 60mph, but back to the point maybe they should only go fast in calm water and slow down a little when it's rough.
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Well my point is this. Its extremely violent smashing through waves at 40 and 50 mph. I could see where a change in material might reduce the energy transfer by 1 or 2 percent, but not anything more.
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Originally posted by john9001
lobster boats don't go 60mph, but back to the point maybe they should only go fast in calm water and slow down a little when it's rough.
You can try and qualify it anyway you want.
Wood boats still are less jarring to passengers.
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So Aqua goes from F-14 specialist to boating expert?
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Lol, now I see why you have earned the reputation that you have.
I don't have any experience on 90ft SEAL boats, but I do on smaller fishing craft and dive-boats. But don't take my word for it, try it out for yourself.
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slowing down when on a tight schedule is not always a option, keeping the payload in a deployable condition is, if a material change can improve the situation. I agree standing up is not always a good option, and not always a good situation if having a whole squad susceptible to knee or ankle injuries is not an option.