RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES??  
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RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES?? - 1/3/2006 2:31:14 AM   
da Rock



Posts: 6982
Joined: 10/11/2005
From: western, NC, USA
Status: offline 		Nylon hinges have them little bitty holes for a reason. Back when nylon hinges came out, they didn't have those little holes. Turns out that after a year or so, the models that had them new and modern hinges started having hinge failures. The hinges that pulled out looked pretty clean for the most part.

Turns out that nylon can start out glued and wind up defeating that glue over time. Seems it might dry out, or shrink, or flex, or it's solvents move to the surface or whatever. No matter what the reason, people started doubting that nylon would glue to wood and stay glued. But those hinges were so GOOD except for that little bitty detail. Man, they were FREE swinging and strong as a bull.

So somebody drilled holes in the flats so that the glue could reach from the wood on one side the slot to the wood on the other side of the slot and "pin" the hinge. Then, no matter what the glue between the nylon flat and the wood did over time, the glue that had penetrated the wood and bridged to the wood on the other side held fast.

I usually drill a couple of bigger holes in mine. Overkill? Nah, I got the time and like to do silly little stuff like that. And when I'm using epoxy, I wipe it on with the side of a toothpick, making sure that all the little holes are filled. Doesn't take any more time to do. And I usually use a T-pin to wipe some epoxy into the slot. Haven't ever had a nylon hinge pull out since they started selling the ones with holes in them.

I would drill for toothpick "pins" if I didn't do the above.

BTW, I just had an excellent opportunity to inspect the nylon hinges that're already installed in a Phoenix Sukhoi ARF. Obviously, that ARF comes with all hinging already done. And they pin almost all of them with straight pins. Out of the three in the rudder (that's 6 slots) two showed slick/shiny "epoxy" cured solidly to the outermost 1/3 of the flats. It was slick because it'd cured way before it had a chance to penetrate into any balsa. And what holes that'd seen epoxy were solidly filled with slick shiny epoxy. And those slots that gave up those shiny examples had nothing but balsa. And all the pins had failed there too.

(in reply to flyierjon)
       Post #: 26

RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES?? - 1/3/2006 2:43:37 AM   
da Rock



Posts: 6982
Joined: 10/11/2005
From: western, NC, USA
Status: offline 		BTW, hinge points work good for the same reason flat hinges with holes in them work good. The hinge points are barbed. The barbs hook into the wood and the wood hooks into the area behind the barbs. And some of the epoxy is influenced into the area under the barbs and forms locking circles. It penetrates all the wood around each barb's narrow parts and fills the gaps and forms little "lock washers" or donuts.

The epoxy cures around the barbs on the hinge points, and cures through the holes in the flat hinges to form mechanical locks that don't rely on the glue holding nylon to balsa.

OK, time for me to go down to the shop and check on how the "hinge glue" test is going. I got a little bottle of that stuff today at the LHS and it looks like the perfect glue for flat hinges. No worry about squeeze-out fouling the center of the hinges when installing. Epoxy always gets into one or two hinge joints and is such a pain. And who knows, this new glue might even stick to the nylon for a decent amount of time too.

(in reply to da Rock)
       Post #: 27

RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES?? - 1/3/2006 1:48:54 PM   
da Rock



Posts: 6982
Joined: 10/11/2005
From: western, NC, USA
Status: offline 		I just tested that Hinge Glue. Details are in a thread I just started about that test. It's probably the best glue to use with Dubro since it's troublefree to use as opposed to epoxy and seems to be as strong for this use.

I plan to do all my ARFs from now on with plastic hinges instead of the supplied CA ones. I've never been happy with the somewhat stiff CA results and Dubro's are completely free. Now they're also dead easy to install. Win win situation....

(in reply to da Rock)
       Post #: 28

RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES?? - 1/3/2006 2:25:40 PM   
Jigley3


 

Posts: 128
Joined: 10/7/2004
From: dryden, ON, CANADA
Status: offline 		Hi all...

Re: The straw method of applying glue to the hinge slot.
A tip I dreamed up years ago is to make a disposable syringe out of the straw by inserting a snug fitting dowel as a plunger. I find very precise amounts of glue can be dispensed and you don’t have to buy the syringes as a length dowel can be cleaned and used fever. .... bert


_____________________________

When flying Never say..."WATCH THIS"

(in reply to Cub Man)
       Post #: 29

RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES?? - 1/3/2006 7:57:26 PM   
hattend



Posts: 2061
Joined: 11/29/2001
From: Redding, CA, USA
Status: offline 		I do mine like this:

http://www.rcuniverse.com/forum/m_1538947/mpage_2/key_/tm.htm

See posts 45 and 46

Don

_____________________________

Revver Brother #94

(in reply to flyierjon)
       Post #: 30

RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES?? - 1/13/2006 4:21:37 AM   
wcole


 

Posts: 9
Joined: 11/1/2005
From: Jasper, AR, USA
Status: offline 		The best way I've found and used is the use of Tite Bond exterior yellow glue found at Home Depot, etc. Simply add it into the hole or slot then rub a thin coat on the hinge and install. Then take a heat gun used for covering and heat the hinges being careful not to shrink the covering. The heat will instantly set and bond the hinges in place. You will not be able to pull them out after about 5 min. They are welded in and the yellow glue will not bind the movement of the hinge.

(in reply to Cub Man)
       Post #: 31

RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES?? - 1/14/2006 2:37:41 PM   
y2kcbr929rr


 

Posts: 11
Joined: 12/30/2003
From: Carrollton, TX, USA
Status: offline 		i use 30 minute or 60 minute epoxy and use disposable syringe and mixing needles about 19 gauge they fit in the hinge slot and you can put it deep enough to get it in the wing behind the stringer that your hinge slot is cut in and when it dries the hinge is coated and there is usually some in the back of the hinge behind the stringer and it creates a locking effect. you can get the syringes and mixing needles from www.jensentools.com.

(in reply to wcole)
       Post #: 32

RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES?? - 3/9/2006 7:25:44 AM   
Wblakeney


 

Posts: 300
Joined: 5/24/2005
From: Houston, TX, USA
Status: offline 		I rembember some people at the field talking about using Canopy RC 56 glue but not sure if that was for flex nylon hinges or robabart hinge points.

_____________________________

If it aint right, fix it. If you can't fix it, don't fly it.

(in reply to flyierjon)
       Post #: 33

RE: WHATS THE BEST WAY TO GLUE IN DU-BRO HINGES?? - 3/9/2006 5:52:46 PM   
JMZ


 

Posts: 43
Joined: 2/15/2002
From: GARFIELD, MN, USA
Status: offline 		Whether using flat hinges or Hinge Points, I would suggest two more steps. First, remember to wipe the hinge's gluing surfaces with alcohol to remove any oils or mold release that might be present from the manufacturing process. Additionally, I put a coarse sanding drum in my cordless Dremel tool on LOW speed and use just the edge of the drum to rough up the surface. Don't apply a lot of pressure or you will actually sand the flat surface thinner (or sand away the barbs on a Hinge Point), you don't want to remove material, just scuff it up a bit. Just let the edge of the drum ride lightly on the plastic as you quickly move it over the surface. If you do some tests, you'll find that it is much harder to peel or break glue away from the roughed up plastic surface than a smooth one. It only takes a few minutes to do this, and it's cheap insurance. I've done this on planes of all sizes for 35yrs+ now, and have never had a single hinge loosen. My Muddiman Flying Machine, for example, is 15 years old now and is hinged with roughened flat Klett hinges (not pinned) and Titebond II. I fly the plane often, hard and fast, with my favorite manuever being a high speed snaproll into a flat spin fom a full throttle, terminal velocity dive (it's a tough little plane!) The hinges are as tight as the day they were installed, 15 years ago.

Jim

(in reply to Wblakeney)
       Post #: 34

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