gravygraham
Well-Known Member
Actually can't remember - its got bilge keels so I guess it's a saily boat.
Gas cylinder welded to hull, with pics - any ideas why?
- Thread starter gravygraham
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EME
Well-Known Member
Some very silly answers above. So Ill add my own!
It is obviously a sea bottom viewing chamber with the stainless steel weld-in addition facilitating a wide angle 9 '' view of the bottom. Careful observation will also reveal the specially-installed underwater light just forward of the viewing hole. Cant be very good .. not a Lumishore light.
Meanwhile your diving partner (who is outside the LPG-Bulb) can add 'special effects' seawater for a reality-based experience. That is why they kept the original valve.
I suspect the original guinea-pig is still recovering from what he/she suspects is tinnitus following the initial deployment of the anchor.
Kinda Cool though !!
It is obviously a sea bottom viewing chamber with the stainless steel weld-in addition facilitating a wide angle 9 '' view of the bottom. Careful observation will also reveal the specially-installed underwater light just forward of the viewing hole. Cant be very good .. not a Lumishore light. Meanwhile your diving partner (who is outside the LPG-Bulb) can add 'special effects' seawater for a reality-based experience. That is why they kept the original valve.
I suspect the original guinea-pig is still recovering from what he/she suspects is tinnitus following the initial deployment of the anchor.
Kinda Cool though !!
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MYStargazer
Well-Known Member
Not the first time this has been tried. See these photos I took (in stunned amazement). Check out the tiny bowthruster, too (this is a hefty steel boat)...
Assassin
Well-Known Member
No, you're all wrong as its the marine version of mid air refuelling.
He moors by going in bow first, engages the self sealing valve with that on the pontoon and it refuels his gas.
He's planning to do the same on the stern for refuelling with diesel.
He moors by going in bow first, engages the self sealing valve with that on the pontoon and it refuels his gas.
He's planning to do the same on the stern for refuelling with diesel.
mlines
Well-Known Member
I think its an emergency stop/full astern system.
You fill it full of compressed air then in an emergency pull open the valve on the front. The rearward thrust then performs an emergency stop or if you keep it open makes the boat go full astern. This is in anticipation of the revised colregs where sail gives way to power.
The downward facing tube is a modification to the above system to get the sail boat up onto the plane. A downward jet blast lifts the bow and creates a cushion of air under the hull.
You fill it full of compressed air then in an emergency pull open the valve on the front. The rearward thrust then performs an emergency stop or if you keep it open makes the boat go full astern. This is in anticipation of the revised colregs where sail gives way to power.
The downward facing tube is a modification to the above system to get the sail boat up onto the plane. A downward jet blast lifts the bow and creates a cushion of air under the hull.
elton
Well-Known Member
I admire the conviction of anyone making a mod like that.
fisherman
Well-Known Member
I'm constantly amazed at the lack of understanding on bulbous bows. Not too long ago a fisherman told a dyed in the wool trad boatbuilder he wanted one, so the stem of a 44ft boat was fitted with extra wood at the forefoot, just to give a side-on profile.
This 19footer has a rudimentary one, parallel sided from a gas bottle mould by the look of it. My estimation, following the experience of one owner, is that it makes the boat dive into a head sea. I think they need the teardrop shape.
http://www.google.co.uk/search?hl=e...hingboat.com%2Fbuccaneer-19%2FDB20641;500;329
This 19footer has a rudimentary one, parallel sided from a gas bottle mould by the look of it. My estimation, following the experience of one owner, is that it makes the boat dive into a head sea. I think they need the teardrop shape.
http://www.google.co.uk/search?hl=e...hingboat.com%2Fbuccaneer-19%2FDB20641;500;329
Bajansailor
Well-Known Member
A few years ago I visited a small bulk carrier ship in the harbour here for a draft survey - she had arrived from Jamaica with a cargo of bulk gypsum on board for the cement factory here.
I measured the drafts with the Mate, and then I was sitting in the crew mess working out the calculations when all hell breaks loose on the ship - the ship was being raided by the local drug squad and Coastguard officers.
They probably had a tip off - I don't know if they found anything on the crew or in the ship, but when the Authorities sent divers down they found a cylinder welded on to the hull, and it was full of compressed marijuana.
Maybe the General is planning on doing a wee bit of smuggling occasionally?
The basic theory of a bulbous bow is that it moves the 'hump' of the bow wave further forward, to create a 'hollow' where the stem meets the water, and this should reduce the resistance. But if it is done wrong (and this is very easy to do) then it will more likely just create or cause increased resistance.
I remember seeing a Prout sailing catamaran at the Southampton Boat Show in the 90's with a pair of cylindrical fibreglass bulbs on her bows - they were supposed to help provide extra buoyancy as well, but they were so small (especially in relation to the weight of fibreglass in them) that I am sure the buoyancy increase was not significant.
I measured the drafts with the Mate, and then I was sitting in the crew mess working out the calculations when all hell breaks loose on the ship - the ship was being raided by the local drug squad and Coastguard officers.
They probably had a tip off - I don't know if they found anything on the crew or in the ship, but when the Authorities sent divers down they found a cylinder welded on to the hull, and it was full of compressed marijuana.
Maybe the General is planning on doing a wee bit of smuggling occasionally?
The basic theory of a bulbous bow is that it moves the 'hump' of the bow wave further forward, to create a 'hollow' where the stem meets the water, and this should reduce the resistance. But if it is done wrong (and this is very easy to do) then it will more likely just create or cause increased resistance.
I remember seeing a Prout sailing catamaran at the Southampton Boat Show in the 90's with a pair of cylindrical fibreglass bulbs on her bows - they were supposed to help provide extra buoyancy as well, but they were so small (especially in relation to the weight of fibreglass in them) that I am sure the buoyancy increase was not significant.
sarabande
Well-Known Member
I'm sure I've seen a Colvic Watson with a similar protuberance.
Mike (Caer Urfa) or Lazy Kipper - any pics ?
Mike (Caer Urfa) or Lazy Kipper - any pics ?
iCs
Active Member
At the risk of diverting this entertaining thread towards a more serious debate...
Could it be that the owner (as I used to) worries about collisions with semi-submerged containers, in the dark on a lengthy passage, and reached the (probably flawed) conclusion that this would help? The notion that the bottle might be sacrificed for the hull probably 'holds water' (sorry). Mind you, this is no explanation for the stainless downpipes.
Has the OP (or anyone else) tried asking the owner - or the welder?
Could it be that the owner (as I used to) worries about collisions with semi-submerged containers, in the dark on a lengthy passage, and reached the (probably flawed) conclusion that this would help? The notion that the bottle might be sacrificed for the hull probably 'holds water' (sorry). Mind you, this is no explanation for the stainless downpipes.
Has the OP (or anyone else) tried asking the owner - or the welder?
gravygraham
Well-Known Member
I would if anyone was about. Perhaps I should slap a post-it note on the cylinder asking the owner to check in here and enlighten us.
I'd love to know how he purged the cylinder before taking his angle grinder to it.
MrB
Well-Known Member
Looks like BAE Systems are at it too, Color Gas are going to be pished.
Firestone
Well-Known Member
Could the pipe out the bottom be used to place an underwater sensor device forward of the main hull to determine water depth/ underwater obstructions ahead.
Divemaster1
Well-Known Member
Viksund (Norewegian boatyard) did a range of boats (starting with the 900 futura) in the early 80's with this feature... but shapened at the front so it would present a sharp forefoot to the waves...
and later 310 St Cruz with a less prominent one...
and later 310 St Cruz with a less prominent one...
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Bajansailor
Well-Known Member
Following on from Alf's Norwegian boats above that have wave piercing bows evolving, here are some more dramatic boats with 'beaks', built by the Bernard Shipyard in France : http://www.bernard-naval.com/pilotage_bernard_naval_en.html
Jim@sea
Well-Known Member
The boat has been converted to LPG. When he measured for the tank he only had an old tape measure and measured 14 yards, but 5 years later when he ordered the tank he ordered it in meters. So when the tank arrived it was 14 x 3" too long.
vas
Well-Known Member
Viksund (Norewegian boatyard) did a range of boats (starting with the 900 futura) in the early 80's with this feature... but shapened at the front so it would present a sharp forefoot to the waves...
odd, Alf this looks VERY much like a Fjord!
I know as it's one of the boats I looked as s/h couple of years ago.
cheers
V.
sarabande
Well-Known Member
I suppose it could be a bit like reactive armour. The 'nose' detects an incoming fishing buoy or chunk of wood, explodes outside the hull formation, and removes the incoming threat.
Must rush out and get one.
Must rush out and get one.
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