What is a ridge wave breaking window?

06kingranch · Jul 6, 2010

Hey guy's my wife and I are looking at cat style yacht's has anyone heard of a ridge wave breaking window or know what that is.

Thanks
06kingranch

K1W1 · Jul 6, 2010

Hi,

I have never heard that terminology used to describe anything on a yacht I am familiar with.

When you were posting prolifically about a year and a half ago it was all go for Lazzara.

Did you ever buy one or what were your impressions after your visit to Tampa?

NYCAP123 · Jul 6, 2010

06kingranch said:

Hey guy's my wife and I are looking at cat style yacht's has anyone heard of a ridge wave breaking window or know what that is.

Thanks
06kingranch
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That's referring to safty glass and how it's designed to break. Here's a little info on ridge lines. There's a bunch more info on the web. Quite frankly, it's over my head and pretty dry.

DETERMINING POINT OF IMPACT AND DIRECTION OF FORCE
Broken glass shows two kinds of fractures: primary, first-made fractures, and secondary, subsequent fractures. Primary fractures are radial. They look like the spokes of a wheel as they radiate outward from the point of impact. Secondary fractures are concentric. They form a series of broken circles, or arcs, around the point of impact.
Radial fractures show up on the surface opposite to the one where the fracturing blow or pressure was applied. These fractures tend to lengthen after awhile because of internal stresses set up by the initial shock. The original radial fracture looks like a wavy line. Extensions to the original fracture run in a straight line. Temperature changes cause extensions to take place more quickly.
Concentric fractures are made by a force working in the opposite direction from that which made the radial fractures. The glass bends, then stretches and breaks on the same side as the first blow. Concentric fractures extend from one radial fracture to another.
WINDOW GLASS
Edges of broken pieces of window glass bear a number of curved lines, called ridge lines. These ridge lines are almost parallel to one side of the glass and perpendicular (at right angles) to the other. Ridge lines are often visible to the naked eye. If they are hard to see, the glass can be turned at angles to the light so the reflection will show the lines. Ridge lines show the increase in stress setup in the glass until it breaks.
In radial fractures, the ridge lines are always perpendicular to the side opposite the impact. (The use of ridge lines to determine point of impact in concentric fractures is not reliable.) Radial fractures follow the 4-R Rule. Ridge lines on Radial fractures are at Right angles to the Rear (side opposite the impact). This rule is valid only from point of impact to the first concentric fracture and valid only to the first bend in the glass. You must find the point of impact to be able to find the direction of force.
The direction of a blow is rarely found by checking a single piece of broken glass. If you must show the way a pane of glass broke, you need enough pieces to find which are the radial edges. Finding the outside and inside of the glass may be helped by examining the glass surface. The amount of dirt, putty marks, and other clues may help you mentally place the pane in its original form.
WINDSHIELD GLASS
Determining the point of impact and direction of force is more difficult in windshield glass. Windshield, or safety glass, is made with a transparent binding agent like vinyl plastic sandwiched between two sheets of plain glass. The binding agent halts the shattering of the glass when it is struck. Due to the structure of safety glass, cracking is often incomplete. Neither the radial nor the concentric cracks go all the way through from one side to the other. If concentric cracks and no radial cracks are on one side this is the side of impact. If only radial and no concentric cracks are found on one side, this is the side away from the impact. The cracked side may be found by sliding a fingernail or sharp-pointed instrument along the glass surface across the apparent cracks.
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06kingranch · Jul 6, 2010

No we're still looking there are so many yacht makers to chose from. Can get confusing sometimes?

Savasa · Jul 6, 2010

Greetings,
Actually NYCAP, those "ridge lines" are technicaly called Wallner lines. Not a dry subject at all. I spent my 35 year career trying to prevent them. A visual analysis of the patterns will indicate the point of initiation of the fracture and to a certain extent the force which caused it.
Peter

NYCAP123 · Jul 6, 2010

Savasa said:

Greetings,
Actually NYCAP, those "ridge lines" are technicaly called Wallner lines. Not a dry subject at all. I spent my 35 year career trying to prevent them. A visual analysis of the patterns will indicate the point of initiation of the fracture and to a certain extent the force which caused it.
Peter
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Dry is in the eye of the beholder. I read a few articles on it and had to fight the urge to shoot myself. I do however appreciate those who understand this stuff and make my world safer. I have a feeling that you may be able to give a good explanation of the term

ridge wave breaking window
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for the OP and we can all learn something. I look forward to it. Try to dumb it down a little though for us old boat jockies if you can .

Savasa · Jul 9, 2010

Greetings,
Sorry NYCAP, I've never heard of the term before. Could be a "made up" term for marketing hype. My "not dry" comment could be due to an advanced case of GLASSHEIMERS.
Peter

NYCAP123 · Jul 9, 2010

Savasa said:

Greetings,
Sorry NYCAP, I've never heard of the term before. Could be a "made up" term for marketing hype. My "not dry" comment could be due to an advanced case of GLASSHEIMERS.
Peter
Click to expand...

That sounds about right, but ridge lines are better known as Wallner lines from what I've read. You may be more familiar with that term. "Ridge Wave Breaking Window" does sound like marketing hype (with a touch of lawyer thrown in) to make one believe those forward facing windows can't cave without actually saying it.

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What is a ridge wave breaking window?

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