Zn Line Gear

[Gray E Fowler]

Anthony

The question is do you want a pretty repair or one that will last?

Most of the gear I have seen, and I have not seen a ZN Line gear, is 
unidirectional "airfoil" halves glued together. This is a very poor 
composite design, but is easy and cheap to make. Over flexing of the gear 
(poor landings) exceeds the shear strength of the resin matrix, which is 
thousands of times weaker than the fiber.The pretty repair involves 
re-glueing. If you are going to do this epoxy will work much better than 
CA, but of course takes more time and effort.
The permenant repair (mo'ugly) involves taking a fiberglass yarn (unravel 
some fabric) and wrap it under tension (after re glueing the split) 90 
degrees to the uni carbon. The more tension without breaking the yarn the 
better. You can use CA for this application as it will never get 
overstressed and it will help you be able to wrap with tension as you drip 
thin CA on the fiber. 



Gray Fowler
Principal Chemical Engineer
Composites Engineering




"Anthony Romano" <anthonyr105 at hotmail.com>
Sent by: discussion-request at nsrca.org
06/16/2004 09:22 AM
Please respond to discussion

 
        To:     discussion at nsrca.org
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        Subject:        Zn Line Gear



After a few less than perfect landings one of my gear legs is starting to 
delaminate. The gear appear to have a foam core. Can I just glue the 
halves 
together with foam safe CA? What is the best method of repair? Is this a 
common issue? Anyone have a spare set they are willing to part with?

TIA

Anthony

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