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Post by deadringer on Jan 9, 2012 17:21:42 GMT -5
Post yous forum tests here on this junk thread. like pictures links text art ext.
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Post by deadringer on Jan 9, 2012 17:22:28 GMT -5
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peterzabriskie
Junior Member
"Did I make that part the best I possibly could have?" Unknown
Posts: 99
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Post by peterzabriskie on Jan 13, 2012 10:10:07 GMT -5
 P.S. This is not Peter welding, but Dave Pratt EAA 650 friend. |
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peterzabriskie
Junior Member
"Did I make that part the best I possibly could have?" Unknown
Posts: 99
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Post by peterzabriskie on Jan 13, 2012 10:47:09 GMT -5
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peterzabriskie
Junior Member
"Did I make that part the best I possibly could have?" Unknown
Posts: 99
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Post by peterzabriskie on Jan 13, 2012 10:48:11 GMT -5
Just too stoked that I can this post a pic to work !
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hans
Full Member
Posts: 166
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Post by hans on Jan 13, 2012 18:27:01 GMT -5
my workshop when I was still working on my IBIS, see ibis.experimentals.deNowadays it looks like a storage bin, but that's a story for another day... ;D  |
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Post by n3480h on Jan 13, 2012 20:01:20 GMT -5
Very clean and organized shop, Hans. Is that a laminated glass gear I see in the middle? Any details to offer?
Tom
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hans
Full Member
Posts: 166
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Post by hans on Jan 16, 2012 7:50:16 GMT -5
Very clean and organized shop, Hans. Is that a laminated glass gear I see in the middle? Any details to offer? Tom That was a nice shop, alas no more so - I really need to clean it up to make place for my Sonerai. The gear is a laminate of 10 layers of ash. I could get you the exact dimensions, but that would have to wait till I get back home. With wheel rims, axes, tires, brakes and what not installed, that assemby weighs approximately 38 pounds - that's for a two-seater with a max. take-off weight of 1080 pounds and a speed envelope somewhat similar to a Sonerai. For more information on that gear, check out: ibis.experimentals.de/progress/landinggear/landinggear.htmlcheers Hans |
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Post by n3480h on Jan 16, 2012 20:12:53 GMT -5
Thanks Hans, I'm doing the same thing in carbon fiber. The ash is beautiful, though.
Tom
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hans
Full Member
Posts: 166
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Post by hans on Jan 17, 2012 3:35:09 GMT -5
I know an IBIS builder who also went the carbon fiber route. In re-engineering
a replacement for the ash laminate, he discovered that not bending strength but
rather stiffness was the driving parameter for his carbon re-design. A much
thinner/lighter carbon laminate would have taken the same loads as the ash laminate,
but it would have ended up much more flexible.
Conclusion: if your carbon fiber project is replacing some other material, don't
engineer just for equivalent strength, compare stiffnesses as well...
cheers
Hans
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Post by n3480h on Jan 17, 2012 19:17:17 GMT -5
That is exactly right, Hans. I wouldn't want a kangaroo landing gear. Load is the least of my concerns. I am using a very high peel strength Hysol bonding agent with a primer between laminations, and continuous woven carbon fiber sheathing on the outside of the laminations. It remains to be seen if there will be weight reduction in this application, but that would be gravy if there is.
Tom
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Post by oahupilot on Jan 17, 2012 21:42:56 GMT -5
That is exactly right, Hans. I wouldn't want a kangaroo landing gear. Load is the least of my concerns. I am using a very high peel strength Hysol bonding agent with a primer between laminations, and continuous woven carbon fiber sheathing on the outside of the laminations. It remains to be seen if there will be weight reduction in this application, but that would be gravy if there is. Tom I wouldn't not do that as a shot in the dark. Composites have several modes of failures and are an orthotropic materials, Failure in composites is generally sudden with no warning. You should be able to compute the TSAI-wu failure criterion for plane stress, hygrothermal affects, and be able to convert between laminate properties and global properties of the part before you build structural components with carbon. |
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