Schweizer 1-29 (oz6702)

 

Schweizer 1-29  (oz6702) by Dave Thornburg from American Aircraft Modeler 1971 - plan thumbnail

About this Plan

Schweizer 1-29. Simple all-sheet profile towline glider model, from the Tenderfoot series.

Quote: "All-balsa towline job catches thermals just like the real plane. Learning flight trimming will be easy with this model. Schweizer 1-29, by Dave Thornburg.

There's a great deal to be said for a painstakingly detailed superscale model with working gyrocompass and scale rivet spacing - but every time I sit down to work up plans for such a plane, it comes out as an all-sheet profile model that is only semi-scale at best.

There's also a lot to be said for this type of plane, especially if you're not yet an expert at building models. From certain angles, sheet profiles look excitingly close to the real thing. You can build an entire profile job in an evening, so if a stray thermal carries it off to the Great Blue Gobbler on the first flight, you're not out much time or money, and you've at least had a memorable flight. You get a lot of air time out of such models, for you don't mind putting them up in less-than-ideal conditions.

The little Schweizer 1-29 has all this going for it and more. It is really a fine performer, and very easy to make fly. Though not really scale in any of its outlines, it has a cute and classically 'sailplane' look, and draws a lot of comment wherever it's flown. Not even the true scale bugs seem to notice the deviations, for the real 1-29 is not a common sight - it's a one-of-a-kind design cooked up by the Schweizer folk back in the late 1950's to test the feasibility of laminar airfoils on sailplanes. The fuselage and empennage are basically the same as the popular 1-23, but the 1-23 wing is less practical for our purposes, since it tapers sharply to almost a needle point at the tip.

Construction If you build the fuselage from two pieces of 2 in wide balsa, there will be a joint right through the wing slot, as the plans show. This makes cutting the slot much easier than if the fuselage were a single sheet. The easiest way to outline the fuselage on the balsa is to lay the full-size plan over one piece of the wood, lining one edge up with the joint line on the plans. Then make shallow pinholes every 1/4 in or so along the outline of the part. When you remove the plans, the outline will be clearly visible on the wood. Follow the line of pinholes with a modeler's knife or single-edge razor. Repeat this procedure for the other half of the fuselage and your 1-29 will be about 1/3 finished!

Set the fuselage aside and begin on the wing. If you can find a piece of four-inch wide Sig Tapered stock, your work is done for you. Just take a sanding block (medium paper) and round the leading edge to the cross section shown on plans. Also round off the slight point formed in milling on the top surface of the wood, about 1-1/2 in back from the leading edge. Now cut the wing in half exactly in the center, using a triangle or T-square to be sure the cut is precisely perpendicular to the leading edge. This is a good opportunity to check your airfoil sanding..."

Dave Thornburg's Schweizer 1-29 from AAM magazine issue 11-71.

Direct submission to Outerzone.

Update 15/04/2021: Added vectorPDF and CAD (dxf and dwg) versions of this plan, thanks to Valeria367.

Supplementary file notes

Article.
VectorPDF plan tracing.

CAD file

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Schweizer 1-29  (oz6702) by Dave Thornburg from American Aircraft Modeler 1971 - model pic

Datafile:
  • (oz6702)
    Schweizer 1-29
    by Dave Thornburg
    from American Aircraft Modeler
    November 1971 
    36in span
    Glider F/F
    all formers complete :)
    got article :)
  • Submitted: 13/06/2015
    Filesize: 79KB
    Format: • PDFbitmap • PDFvector • CADfile
    Credit*: theshadow

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Download File(s):
  • Schweizer 1-29 (oz6702)
  • Plan File Filesize: 79KB Filename: Schweizer_1-29_oz6702.pdf
  • Supplement Filesize: 3541KB Filename: Schweizer_1-29_oz6702_article.pdf
  • Supplement Filesize: 113KB Filename: Schweizer_1-29_oz6702_vector.pdf
  • CAD Zip Filesize: 52KB Filename: Schweizer_1-29_oz6702_cad.zip
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Notes

* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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