Carabiner construction

[matdand]

Hey guys,
Just got my new DMM Ultra-O biners. I noticed they say its an I Beam construction.  Im guessing its beacause of the groove in the middle that gives it its ''I'' shape. Which made me think. What makes an I Beam construction better (or worse)? What other construction types are out there? Is their a web site about biner construction and their advantages and limitations? Thanks for the help.

 

[Tom Dunlap]

When I have questions like that I start asking Google and the manufacturers.

Another good source is the Gearheads forum at rockclimbing.com

 

[trevmcrev]

Think about any kind of engineering or constuction, buildings for example.

I beams or girders give similar strength benefits with reduced volume & therefore weight, compared to say solid bar or rod.

The strength will be greatest in the top to bottom plane of the "I".

The ultra-O design is in keeping with that.

Is it necessary....probably not.

Is it cool....definately yes!

 

[BobT]

The technical term is Moment of Inertia. When you bend a beam (or a stick), one side is under tension and the other is under compression. The material in the middle is unloaded and contributes nothing to either the strength or stiffness, The trick to making a lightweight beam is to remove the material in the middle. You can see this with I-beams or railroad tracks. There has to be some material in the middle to transmit the forces from one side to the other.

 

[matdand]

Cool, thanks guys. I did try to check out google before but couldnt find much useful info. Il try out rockclimbing.com, see whats up. Thanks again for the help.

 

[matdand]

Think I found some interesting stuff:

http://www.treemagineers.com/downloads/Karabiners_and_Connectors.pdf


http://www.treemagineers.com/downloads/Karabiners_and_Connectors.pdf

 

[matdand]

oops

http://www.treemagineers.com/downloads/Go_Configure.pdf

 

[easyphloem]

Do you like the DMM Ultra-Os?



SZ

 

[NickfromWI]

I'm getting some!

 

[matdand]

Ya the Os are good. Not much differnet than the OKs. A little lighter. I didnt have the oks so I got the Os. I had tried the oks on a few occasions. Pretty similar.

 

[cory]

I'm getting some nice steel ovals from Boston Bull

 

[Colin]

the os are very nice and keep the prussic nice and centered on the hitch climber. my oks always wanted to rotate. i beams have more surface area and that equals more surface tension....... common lingo..... they don't bend as easily with less material.