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Post by GotrekGurnisson on May 29, 2008 18:14:51 GMT 10
My Duck is in for a service at the moment so I thought I'd post a pic of the golden rods while it's naked.
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Post by Pij on May 29, 2008 18:23:17 GMT 10
Thanks Gotrek, I've never seen them before. As I understand it (please set me straight if I'm wrong) the yellow bit slides inside the blue bit, and the metal rods at each end don't continue through, but are glued into the yellow bit, right?
Appearance-wise, they look like the rods on my Multiplex MiniMag, but with it both layers of plastic tube are simply guides for the wire inside
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Post by felix on May 29, 2008 18:40:54 GMT 10
golden rods!!! love those things pij you were right but for one point......the rods are "self tapped" into the yellow rod
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Post by GotrekGurnisson on May 29, 2008 18:50:06 GMT 10
The yellow tube slots inside the blue tube and has a series of ridges on its outer surface. The metal rods are only about 20mm long and screw into either end of the yellow tube. The idea is that this allows you to bend the tubes in curves, but from what I've read (and seen firsthand with a friend's plane) is that bending the linkage eventually leads to slop. If you can keep them straight like in my pic above you should minimise that.
Alternatively you could use cables for this arrangement, but in my experience they tend to be a PITA to adjust because they need to be soldered.
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Post by Pij on May 29, 2008 19:00:43 GMT 10
Now I have the idea, thanks guys.
Gotrek, you seem to have a different spar system to my Duck. Do you have a drag spar instead of the 3rd spar? Could you please show an overall pic of your naked Duck?
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Post by GotrekGurnisson on May 29, 2008 19:22:52 GMT 10
OK, here it is in all its naked glory. On the top side it has a single full length carbon ribbon spar. On the underside it has a short carbon ribbon spar at the back and a full length ply ribbon spar. There's ply along the trailing edges. The bottom of the servo and Rx cutouts are sheeted with balsa. I had a prang which broke the trailing edge ply and put a big tear in the wing. As part of the repair some short sections of carbon tube were added along the trailing edge for strength which you can see on the underside shot.
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Post by felix on May 29, 2008 19:30:59 GMT 10
hey there gotrek (warhammer fan?)......out of interest did it tear in the corner where that balsa "duck" tail meets the foam wing? my last bee tore in that position and my newest bee consistently shows cracks in the vinyl in the same spot....just a little research
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Post by GotrekGurnisson on May 29, 2008 19:48:33 GMT 10
Yup (see the post I just made about it in the renovation thread). The duck tail is glued onto the ply that runs the full length of the trailing edge. The ply broke right at that point and the tear in the foam started there.
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Post by Pij on May 29, 2008 19:52:07 GMT 10
Great pics, Gotrek. I went back and forwards several times from the pic to the descrip.
I had tears in that spot before my reno, just in the covering tape, no sign of damage to the filament tape or foam, but there had obviously been flexing at that point. I rubbed CA into the sanded filament tape at that spot during the reno. I considered putting carbon or bamboo there, but didn't want to cut through the existing filament tape.
I should note, that I used FLEXIBLE CA there.
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