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Old 08-27-2009 | 01:26 PM
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twn
 
Joined: Apr 2007
Posts: 871
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From: Revelstoke, BC, CANADA
Default RE: Goldberg Ultimate Build 60 size by twn

A quick update. I am much further along than this and i will get some more pics today and post them. I'm currently fitting the servos in via a plate as fallingleaf did. I'm a bit nervous with this method. I used basswood mounted on the end grain to the 1/16" aircraft grade plywood plates for the servo mount. I punched a bunch of holes halfway through the plywood and a good 1/16" in to the end grain of the mount and used some strong 30 min epoxy (warmed a bit to make it more runny to soak in to the hard plywood better) to attach. Punching a ton of little holes allows the epoxy to REALLY soak in and grab better. I hope it doesn't rip out in a hard blender or insane tumbles... I'm so use to hard mounting a servo to the surface of a wing rather than hiding it. I was just going to mount it this way but I wanted to try the plate idea for kicks.

Any how her are some preliminary pics of the wing construction. I moved the hinge line forward 5/16". I made a jig and pinned all the ribs together and removed the 5/16" from them all at the same time. They are all identical. This will give me a little more than 2" per aileron and should give that extra bite in a hover. I was going to cut the T.E stock down the 5/16" but I'm glad I didn't. The wing, even though is sheeted on the leading edge, is still somewhat flexible and I think that T.E. stock is adding to the strength of the wing. The weight of the bottom wing so far with all of the sheeting on and plywood plates in is 11 ounces. Still reasonable.

I noticed that the right side of the plan (on the wing) is actually 1/4" wider than the left side, lol. I wonder if the designer was drinking the day he drew these plans up. I had to re-cut the dados in the T.E. stock as they didn't line up to the plans. I pinned all 4 of them squared up (faster to do all 4 at once) and made a jig to do this with the correct angle for the ribs. You can see the sanding jig in the pic. This is when I noticed that the right side of the plan was way off. I corrected the placement of the ribs at the main spar so all will line up and is square. I will duplicate this for the top wing.

A bit of a bummer, the bottom wing has a slight warp. It sits up about 1/32" on the T.E. of the right side. I made damn sure all points were tightly secured when sheeting and I accounted for the removal of the 5/16 from the T.E. by putting a piece of that size back in so the sheeting jig would sit in the right place at the center of the wing. I'm not sure how it happened but I'm positive I can get it out when I cover the plane.


Sorry, I should add, I added 1/16" balsa to the top of the T.E. stock to bring it out to the height of the cut ribs and I will have to add 5/16" to the inner aileron stock that is glued to the wing. I don't have any 5/16 so I'll just laminate 1/16 & 1/4 to make it.
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