CA

[Keith Black]

Regarding foam safe CA vs. regular CA, I've done tests with this and viewed the foam from the back side after the hinges were installed. With 1/4" facing I didn't see any damage to the foam. The CA quickly soaks into the hinge material and balsa and in my experiments didn't attack the foam. Of course, I guess it may depend on how much CA is used, but if you use enough to soak through and attack the foam then you're probably using too much.

Therefore, if you only have regular thin CA then it should work just fine. Do make sure that the CA is fresh though, thin CA tends to not soak in as well once it starts to age. Hinging surfaces is one time I won't settle for using an aging bottle of CA. My experience is that the Super Thin Zap is excellent for hinging because it soaks in so well. 

Keith
  ----- Original Message ----- 
  From: Bob Kane 
  To: discussion at nsrca.org 
  Sent: Wednesday, June 09, 2004 9:02 AM
  Subject: Re: Re: CA


  Yes, put the higes in and install the movable surface to the fixed surface before gluing. If you try to do one side at a time, say put the hinges in the elevator and glue them, then install the elevator to the horizontal stab, the CA will seal the porous surface material of the hinge and it will not wick properly.

  I forgot to mention, use foam safe CA if you are working with foam core parts. You can use a pin in the center of the hinge to keep it centered while pushing it into the mating surface. Draw a line on the center of the hinge so you can verify it is centered before gluing. Take the pin out before you put the CA on. 

  tph1 at bellsouth.net wrote:
    Do you dry install both sides and then glue? Aileron and wing, elevator and stab etc.?
    > 
    > From: Bob Kane 
    > Date: 2004/06/09 Wed AM 08:07:38 EDT
    > To: discussion at nsrca.org
    > Subject: Re: CA
    > 
    > Thin. Dry install all the hinges for a particular surface in the slots and make sure they are centered. Bend the surface one way, and put a couple of drops of thin CA in the center of each hinge. The glue should wet out the surface, add thin CA until it stops wicking into the material. Use a tissue or swab to clean any excess CA. Do the same side of all hinges. Clean any CA off the parts, turn over, and repeat on the other side of the hinges. 
    > 
    > Do not go back and add glue "just to be safe". Once the CA sets, any additional glue will not wick into the surface of the hinge and can create a sharp ridge in the center of the which will lead to failure over time.
    > 
    > I have never had a hinge fail using this technique. 
    > 
    > Tom Hinton wrote:
    > What type CA for Radio South hinges, thick, medium or thin?
    > thanks, Tom
    > 
    > 
    > Bob Kane
    > getterflash at yahoo.com
    > 
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  Bob Kane
  getterflash at yahoo.com


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