Windrifter (oz6700)

 

Windrifter (oz6700) by Tom Williams from Craft Air 1974 - plan thumbnail

About this Plan

Windrifter. Radio control sailplane.

Quote: "INTRODUCTION. Craft-Air's Windrifter was introduced in the fall of 1974, and imrnediately started to amass a Contest trophy record which, at this writing two years later, far exceeds that of any other R/C sailplane in the United States. The design concepts were quite different from the trend at that time. As the designer, I am extremely proud that these concepts have become the design trend today.

At Craft-Air our development program never stops, and as a result, our product designs are updated and improved. This latest model of the Windrifter incorporates several structural changes while retaining its original aerodynamic superiority. Chances are, you purchased your kit from a reputable local dealer, and he, you, and I have an interest in common - your success. When in doubt, take your questions to your dealer; he wants to help and is qualified to do so. If this is not possible, you rnay call me, Tom Williams, at Craft-Air (213) 340-2114, during business hours.

GENERAL. I will begin these instructions by assuming that you own all the necessary tools, and have a very flat, good, building surface. For this I recommend the soft composition ceiling material (Celotex) that comes in 2 x 4 and 4 x 8 foot sheets. Three different kinds of adhesive will be required to construct your Windrifter. Contact cement of the kind used on plastic laminate counter tops (Formica) will be used to laminate plywood to balsa. (Water base contact cement will not work.) Epoxy will be required where maximum joint strength is needed. Aliphatic resin (Titebond, etc.) will be used for most of the structure. Cyanoacrylate cements (Hot Stuff, Zap, etc.) may be used, but only as a temporary bond. Joints made with cyanoacrylates must be reglued with aliphatic resin. This in spite of any advertising claims to the contrary.

WING. The Windrifter wing is widely noted for its structural integrity, as well as its performance, but regardless of its design, it will be no stronger than you make it. Please don't redesign it. It doesn't need beefing up. If you use good building techniques and build it light, you will be pleased with the results. DO USE PLENTY OF EPOXY ON THE WING ROD TUBE.

Because of the amazingly wide speed range of the Windrifter, many pilots find spoilers serve only to add weight (approx 1 oz). However, a very effective spoiler system has been developed for the Windrifter and is available as an accessory from the same source as the sailplane kits.

1. Cut the wing views from the plans and pm down the RIGHT wing plan, under waxed paper, to your building board. Both the center section (root section) and the tip section of a wing half will be constructed simultaneously.

2. Set the squared end of a 21 x 1/8 x 3/8 in spruce spar at the line between the two TOUCHING W-4 ribs, and extend to your left beyond W-1.

3. Butt a 30 in spar to that and extend to the tip..."

Direct submission to Outerzone.

Update 15/12/2015: Added alternate scan of this design, thanks to dfritzke.

Update 25/09/2018: Added kit instructions, thanks to AlanSinclair.

Supplementary file notes

Alternate scan, this one shows the wing without spoilers. Dated as 1976 (Rev 12-3-76).
Instructions, complete, 8 pages.

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Windrifter (oz6700) by Tom Williams from Craft Air 1974 - model pic

Datafile:
  • (oz6700)
    Windrifter
    by Tom Williams
    from Craft Air
    1974 
    99in span
    Glider R/C
    formers unchecked
  • Submitted: 12/06/2015
    Filesize: 377KB
    Format: • PDFbitmap
    Credit*: guybyars, dfritzke, AlanSinclair

Windrifter (oz6700) by Tom Williams from Craft Air 1974 - pic 003.jpg
003.jpg

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  • Windrifter (oz6700)
  • Plan File Filesize: 377KB Filename: Windrifter2_oz6700.pdf
  • Supplement Filesize: 732KB Filename: Windrifter2_oz6700_alternate.pdf
  • Supplement Filesize: 2604KB Filename: Windrifter2_oz6700_instructions.pdf
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Notes

* Credit field

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Scaling

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