<br><font size=2 face="sans-serif">Love your attention to details, kieth. I agree with your findings about the crayon. any of it that slips into the slot, decreases the bonding surface. I don't use them. However, I like to stick a straight pin through the middle so that I can guarantee that an even amount of hinge sticks into both sides of the hinge.</font>
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<br><font size=2 face="sans-serif">--Lance</font>
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<td><font size=1 face="sans-serif"><b>"Keith Black" <tkeithb@attbi.com></b></font>
<br><font size=1 face="sans-serif">Sent by: discussion-request@nsrca.org</font>
<p><font size=1 face="sans-serif">02/27/2003 02:50 AM</font>
<br><font size=1 face="sans-serif">Please respond to discussion</font>
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<br><font size=1 face="sans-serif"> To: <discussion@nsrca.org></font>
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<br><font size=1 face="sans-serif"> Subject: Re: CA hinges installation - and CA talk</font></table>
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<br><font size=2 face="Arial">Oops, instead of Radio City 1/4" scale hinge I meant Radio City 1/4 scale hinge.</font>
<br><font size=3 face="Times New Roman">----- Original Message ----- </font>
<br><font size=3 face="Times New Roman"><b>From:</b> </font><a href=mailto:tkeithb@attbi.com><font size=3 color=blue face="Times New Roman"><u>Keith Black</u></font></a><font size=3 face="Times New Roman"> </font>
<br><font size=3 face="Times New Roman"><b>To:</b> </font><a href=mailto:discussion@nsrca.org><font size=3 color=blue face="Times New Roman"><u>discussion@nsrca.org</u></font></a><font size=3 face="Times New Roman"> </font>
<br><font size=3 face="Times New Roman"><b>Sent:</b> Thursday, February 27, 2003 2:44 AM</font>
<br><font size=3 face="Times New Roman"><b>Subject:</b> Re: CA hinges installation - and CA talk</font>
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<br><font size=2 face="Arial">I have some questions regarding the foam friendly CA. </font>
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<br><font size=2 face="Arial">Is it as thin and as strong as the regular stuff? </font>
<br><font size=2 face="Arial">If so why isn't all CA made to be foam friendly? It would seem to me that if the chemistry of the CA is changed such that it didn't damage foam then it is reasonable to assume that other properties may differ as well. In other words, what does one "give up" by using the foam friendly stuff?</font>
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<br><font size=2 face="Arial">Without knowing this I'd be very concerned about using it rather than the regular stuff. </font>
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<br><font size=2 face="Arial">Personally I'd think with just a few drops on the hinge there wouldn't be enough foam damage to make a difference anyways. Think about it, people honeycomb their wings. What's the big deal if a wee bit of foam is eaten away? One argument may be that the trailing edge and control surfaces aren't honeycombed and foam lost in these areas is more critical. Well I have a hard time buying that. </font>
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<br><font size=2 face="Arial">BTW, after writing the above paragraph I experimented with this several times using a Radio City 1/4" scale hinge going through 1/4" balsa into foam attached to the back side of the balsa. The CA never did any damage to the foam and seemed to be absorbed completely by the balsa. Of course, I didn't use the "Slot Machine" to make the slots, I used a #11 blade. With wider slots the CA may make it's way to the foam more easily. </font>
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<br><font size=2 face="Arial">One thing I've noticed that all thin CA's are not created equal. Therefore I would think the quality of the hinge may be effected by type of CA one uses. For example, it's been my observation that the Bob Smith Industries stuff (that every hobby shop puts their own name on) doesn't soak in nearly as well as Zap CA. (If Bob Smith is on this forum my sincere apologies for singling you out :-) ).</font>
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<br><font size=2 face="Arial">And while I'm on a roll here. I've heard the crayon idea many times before, and quite frankly it never made sense to me. My first thought was that hinges are absorbent enough to wick the CA down into the hinge slot, so why would crayon on the "outside" of the hinge prevent the CA from wicking right through the middle of the hinge? Well, I did some tests with the Radio City hinges and found that the hinge itself really isn't absorbent, not without contacting balsa anyways. You can drip CA right on these hinges and it will just puddle in droplets and not soak in. But touch a piece of balsa to it and SLURP, the CA spreads through the wood and across the surface of the hinge and bonds instantly. It appears that the balsa actually absorbs the CA and the surface of the hinge provides a superb bonding surface. Probably due to its texture (the chemist among us could probably explain, Gray, you there?).</font>
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<br><font size=2 face="Arial">So, in trying to prove that CA would soak under the crayon I found that what really happens (on these hinges anyway) is that it doesn't soak in at all, at least not deep into the hinge fabric. As to the crayon I marked a hinge with a heavy crayon line on both sides and applied drops of CA and as stated it pooled not only on the crayoned portion, but on the non-crayoned portion. Therefore, my theory was incorrect, but I still am unsure that the crayon would do any good. If you ended up with excess CA caked on the hinge gap and you had a crayon line there then you'd just have CA caked over the crayon line (I tested this and it does bond to the crayon line). </font>
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<br><font size=2 face="Arial">I'd be interested in hearing other's experiences with different types of CA and opinions/suggestions about CA hinges.</font>
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<br><font size=2 face="Arial">Keith Black</font>
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<br><font size=3 face="Times New Roman">----- Original Message ----- </font>
<br><font size=3 face="Times New Roman"><b>From:</b> </font><a href=mailto:bcarpenter@greenvilleisp.net><font size=3 color=blue face="Times New Roman"><u>Bill Carpenter</u></font></a><font size=3 face="Times New Roman"> </font>
<br><font size=3 face="Times New Roman"><b>To:</b> </font><a href=mailto:discussion@nsrca.org><font size=3 color=blue face="Times New Roman"><u>discussion@nsrca.org</u></font></a><font size=3 face="Times New Roman"> </font>
<br><font size=3 face="Times New Roman"><b>Sent:</b> Monday, February 10, 2003 11:13 PM</font>
<br><font size=3 face="Times New Roman"><b>Subject:</b> Re: CA hinges installation</font>
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<br><font size=3 face="Times New Roman">Another suggestion FWIW, if you have a foam wing core under the balsa sheeting and glued to the trailing edge, use foam friendly CA. It will not eat the foam if it gets in that deep. Also, some people either drill a hole in the center of the slot to allow CA to go deeper into the slot at the center, or some CA hinges come with a slot in the middle of them to allow CA to go in the slot deeper. <br>
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Bill 3544<br>
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From: "Chris Larson" <csmulti@volcano.net><br>
To: <discussion@nsrca.org><br>
Subject: Re: CA hinges installation<br>
Date: Mon, Feb 10, 2003, 9:59 PM<br>
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<br><font size=2 face="Arial">Xavier-<br>
I have used a crayon from my sons toy box, sharpened, and drawn along the hinge line. This not only serves as an alignment point, but also as a release agent for the glue. I guess I should also note I haven't used that method on most of my planes ( just wicked in CA at the hinge line, let dry, and flex vigorously back and forth ) with great results too. You shouldn't worry too much about making the hinge stiff - just be sure you are using THIN CA!! :-)<br>
Chris Larson<br>
NSRCA 3484</font>
<br><font size=3 face="Times New Roman">----- Original Message ----- <b><br>
From:</b> Anne & Xavier <</font><font size=3 color=blue face="Times New Roman"><u>mailto:xavier.mouraux@sympatico.ca</u></font><font size=3 face="Times New Roman">> <b><br>
To:</b> </font><font size=3 color=blue face="Times New Roman"><u>discussion@nsrca.org</u></font><font size=3 face="Times New Roman"> <</font><font size=3 color=blue face="Times New Roman"><u>mailto:discussion@nsrca.org</u></font><font size=3 face="Times New Roman">> <b><br>
Sent:</b> Monday, February 10, 2003 7:56 PM<b><br>
Subject:</b> CA hinges installation<br>
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Hi guys,</font><font size=3 face="Times New Roman"><br>
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I am about to install the CA hinges (fiberglass) on two of my winter projects and I would appreciate any recommandations on the proper procedure to do it. I have the tight slots done. I am worrying about the glue making the hinge stiff. How do I ensure the glue doesn't go in the flexing area ?</font><font size=3 face="Times New Roman"><br>
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Note that these are 2 sport planes that I am using to improve my building skills before moving on to pattern plane building next year. I have been flying second hand pattern planes.</font><font size=3 face="Times New Roman"><br>
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Thanks</font><font size=3 face="Times New Roman"><br>
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Xavier</font><font size=3 face="Times New Roman"><br>
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