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Old 21 September 2005, 09:18   #1
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Definitions of RIB related words

There are many words which keep popping up on this forum which I don't quite understand. I'm sure im not the only person in this boat, so maybe we could have a page with definition on it......

Words that come to mind:

Chine (and reverse chine)
Stepped hull
Spray rail

That's all i can think of for now....

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Old 21 September 2005, 10:13   #2
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Quote from article here :

Quote:
# Stepped hulls— One of the earliest attempts to increase boat speed involved putting small "steps" in the hull. Steps are, essentially, elevation breaks that create multiple running surfaces. As the boat speed increases, it rides on these surfaces, with area of contact with the water moving progressively further aft. The results? Less hull in contact with the water, less friction and more speed with less power than a conventional deep-V hull. The knock, at least against some stepped-bottom boats? Less wetted surface in the water, less friction and reduced lateral stability and control.
Also some bits on stepped hulls here on boatmad.
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Old 21 September 2005, 11:02   #3
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This is quite useful and covers most things. Chine is defined but spray rail is not so ...

My understanding of a spray rail is as follows:
A spray rail is a small angled section which stands proud of the main hull surface. It usually starts as nothing at the bow and becomes more pronounced as it works its way back towards the stern, although it never usually becomes much larger than a couple of centimetres wide. A boat may have none, one, two or more. The purpose is to deflect water outwards and downwards from the hull surface, thus giving a drier ride. If you stand at the bow and look down the length of the hull, the spray rail(s) is the bit(s) that sticks out! Hope this makes sense!

I'm sure one of the experts will correct me though!
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Old 21 September 2005, 18:14   #4
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My problems are more basic. A year ago I was still working out what transom, grp, painter etc meant, let alone advanced abstract concepts like starboard....
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Old 21 September 2005, 18:19   #5
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Quote:
Originally Posted by brucehawsker
My problems are more basic. A year ago I was still working out what transom, grp, painter etc meant, let alone advanced abstract concepts like starboard....
I also suffer with such problems: Some people say transform, others say transom. Which one is it???
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Old 21 September 2005, 18:51   #6
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Reverse chine - easy to draw but a bit more difficult to describe.

The chine is where the bottom of the boat joins the side.
Most chines incorporate a spray rail - a horizontal section up to a few inches wide. These deflect spray and increase lift.

A reverse chine is where this spray rail is angled down and much wider than normal. The idea is that it should should trap water and air under the hull for lower drag.

The front end of a Boston Whaler is an extreme example of this feature.

These are Seariders words lifted from this Forum
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Old 23 September 2005, 08:28   #7
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While we are on the subject.....

...I thought that WOT meant wind over tide but thought I also saw it in the context of engine performance. So what is WOT?
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Old 23 September 2005, 08:36   #8
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W.O.T = Wide Open Throttle. Or the loudstick pushed as far forward as it will go!
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Old 23 September 2005, 08:49   #9
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Quote:
Originally Posted by Tim M
There are many words which keep popping up on this forum which I don't quite understand.
Maybe this will help, mainly sailing terms, but some are applicable to RIBS

Ahoy
The first in a series of four letter words commonly exchanged by skippers as their boats approach one another

Bar
Long. Low lying navigational hazard, usually awash, found at river mouths and harbour entrances, where it is composed of sand or mud, and ashore, where it is made of mahogany or some other dark wood. Sailors can be found in large numbers around both.

Boom
A Laterally mounted spar to which a sail is fastened, used during jibing to shift crew members to a fixed, horizontal position.

Bulkhead
Discomfort suffered by sailors who drink too much

Cabin
A cramped, closet like compartment below decks where crew members may be stored – on their sides if large or on end if small – until needed.

Calm
Sea condition characterised by the simultaneous disappearance of the wind and the last cold beer

Channel
Narrow stretch of deep or dredged waterway bordered by buoys or markers that separates two or more grounded boats

Current
Tidal flow that carries a boat away from it desired destination or toward a hazard.

Fitting Out
Series of maintenance tasks performed on boats ashore during good weather weekends in spring and summer months to make them ready for winter storage.

Flipper
Rubber swimming aid worn on the feet. Usually available in two sizes, 3 and 17

Flotsam
Anything floating in the water from which there is no response when an offer of a cocktail is made.

Fluke
The portion of an anchor that digs securely into the bottom: also, any occasion when this happens on the first try.

Galley
Ancient: Aspect of seafaring associated with slavery.
Modern: Aspect of seafaring associated with slavery

Gear
Generic term for any pieces of boating equipment that can be forgotten in the back-seat or boot of a car, left behind on a pontoon, soaked in the bottom of a dinghy or lost over the side of the boat.

Gimbals
Movable mountings often found on shipboards lamps, compasses etc which provide dieting passengers an opportunity to observe the true motions of the ship in relation to them, and thus prevent any recently ingested food from remaining in their digestive systems long enough to be converted into unwanted calories.

Grounding
Embarrassing situation in which a sailor returns to shore without leaving his boat.

Hatch
An opening in a deck leading to the cabin below with a cover designed to let water in while keeping fresh air out.

Hull speed
The maximum theoretical velocity of a given boat through the water, which is 1.5 times the square root of its waterline length in feet, divided by the distance to port in miles, minus the time in hours to sunset cubed.

Jibe
Course change which causes the boom to sweep rapidly across the cockpit;
also, frequent type of comment made by observers of this manoeuvre.

Lanyard
A light line attached to a small article so that it can be secured somewhere well out of reach.

Leeward
The direction in which objects, liquids and other matter may be thrown without risk of re encountering them in the immediate future.

Life jacket
Any personal floatation device that will keep an individual who has fallen off a vessel, above water long enough to be run over by it or another rescue craft.

Mizzen
The shorter aft mast on a yawl or ketch. Any mast that is no longer there.

Moon
Earth’s natural satellite. During periods when it displays a vivid blue colour, sailing conditions are generally favourable.

Motor sailer
A hybrid boat that combines the simplicity and reliability of sail power with the calm and serenity of a throbbing engine.

Ocean racing
Demanding form of sailing practised by sportsman whose idea of a good time is standing under an ice cold shower, fully clothed while re examining there last meal.

Passage
Basically a voyage from point A to point B, interrupted by unexpected landfalls or stopovers at point K, point Q, and point Z.

Pontoon
Harbour landing place that goes crack, crunch when hit

Pilotage
The art of getting lost in sight of land, as opposed to the distinct and far more complex science of navigation used to get lost in offshore waters.

Port
1. Left on a boat.
2. A place you wish you never left on a boat.

Propeller
Underwater winch designed to wind up at high speeds any lines left hanging over the stern.

Radar
Extremely realistic kind of electronic game often found on larger sailboats. Players try to avoid colliding with “blips” which represent other sailboats, large container ships and oil tankers.

Regatta
Organised sailing competition that pits yours against your opponents’ luck.

Sailing
The find art of getting wet and becoming ill while slowly going nowhere at great expense.

Satellite Navigation
Sophisticated electronic location method that enables sailors to instantly determine the exact latitude and longitude, within just a few feet, anywhere on the surface of the surface of the earth, of whatever it was they just ran aground on.

Single handed sailing
The only situation in which the skipper does not immediately blame the crew for every single thing that goes wrong

Tides
The rise and fall of ocean waters. There are two tides of interest to mariners: the ebb tide sailors encounter as they attempt to enter port and the flood tide they experience as they try to leave.

Yardarm
Horizontal spar mounted in such a way that when viewed from the cockpit, the sun is always over it.
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Old 23 September 2005, 09:23   #10
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Excellent!
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