Zn Line Gear

[Adam Glatt]

http://www.nbengineering.net/* *sells a curved swept gear like the ZN 
line set, as well as a straight swept like the Bolly set.*
*
Anthony Romano wrote:

> Thanks Gray. Will see how much of a mess I can make tonight. Anyone 
> found any reasonably priced substitutes?
>
> Anthony
>
>
>> From: "Gray E Fowler" <gfowler at raytheon.com>
>> Reply-To: discussion at nsrca.org
>> To: discussion at nsrca.org
>> Subject: Re: Zn Line Gear
>> Date: Wed, 16 Jun 2004 09:40:29 -0500
>>
>> 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
>>         cc:
>>         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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