Harbinger Build

[Sled-Works 1]

Took another shot at the spoiler servo mount. Seems to work.

[Sled-Works 1]

Started framing up the right wing to check for fit. Tweaked a couple pieces and we are off and running. Will frame up both wings, build a balsa box in each (Tom method for those of you scoring at home), and then the inner box with spoiler.
Arup - I don't intend to daisy chain the linkages as you mentioned...will mock that up to test it and will have pictures of that when I get there. You are correct in that we don't need the excess slop. More to follow. Until then, here is a picture of the right inner wing trial fit. I was surprised at the added stiffness provided by the diagonal hardwood members.

[ARUP]

I'm thinking... don't 'daisy chain' the links from each spoiler paddle to the next or cumulative 'slop' will accrue. That would be akin to a locomotive initiating its pull of the cars. Have one push-pull rod (wire) with each paddle connection soldered to the main push-pull rod, right?

[kjkavaney]

Nice Build thread David. Can't wait to see this one fly.

[Sled-Works 1]

Tom - I'm going to follow your lead with the double box. Great suggestion, thank you. This contraption is fussy and getting all those parts in the right place, moving properly, will be tough enough
when isolated on the bench.
Arup - They are crazy spoilers. Ha.

[ARUP]

Crazy spoilers!

[Tom]

Trying to work out the details for the spoiler "box" last night. I like the idea of building the box on the workbench and then placing it in the wing]

I have done exactly that.......the only difference is I use 2 “boxes”......the first is built of hard balsa built into the wing and the spoiler box itself is fabricated from ply which then mounts inside the first box.......the reason for doing it that way is it’s just easier to fabricate the actual spoiler box because you already have the balsa box that is made to fit the wing profile.

[Sled-Works 1]

Trying to work out the details for the spoiler "box" last night. I like the idea of building the box on the workbench and then placing it in the wing. Will keep you posted on how that works when I get there. The bearings just came in the mail so it is game on. Here is a section sketch showing how it could come together...petty sure it can be simplified.

[Sled-Works 1]

Thanks Len - Made a little progress last night as well. Four left paddles and four right. Will have to mock up one side to test the pushrod mechanism/system to make sure it works properly before building it into the wing. Each 'Z' shaped arm is made from (1) 1/16" ply piece sandwiched with (1) 1/32" ply piece in an effort to keep them stiff and from warping. That seems to have worked well.

[lenb]

YEAHHHHHHH.
Back at it

[Sled-Works 1]

Finally back to the build and working on the crazy spoilers. They sure look like they are going to be a handful...what could go wrong? Ha ha.

[Sled-Works 1]

Yes, the plan is to glass the fuse Michael.

[ARUP]

Nice! Are you going to glass the fuse once completed?

[Sled-Works 1]

Got the stabs female plug wired and Gooped in place the other night. After all that goes into planning, fitting, aligning, and then making these work, they sure don't look like much when completed. Ha. Its a good fit and very solid. Then with the stab attached to the fuse, I cut scrap foam to fit on either side of the plywood and hard balsa fuse keel to continue the fuse lines to the rudder. This step seemed a little daunting at first with the rudder pushrod on one side, the stab meeting the fuse, and the oddly shaped fuse keel. Once started the two pieces were done in no time and gluing in place. - David

[Sled-Works 1]

Here we go....and by the way, this is about when Mattsson would typically chime in. Tim?