About this Plan
Corsair. A 48 inch A/2 class towline glider.
Quote: "Corsair was first designed as a simple, easy to build, glider for Mrs Holt to fly in the 1951 Women's Cup contest. Low aspect ratio one-piece wing, large tailplane and generous material sizes make it an ideal project for any beginner, yet its performance rates high, as the following record shows [see table].
First model was built by Mr Holt, and the second by his wife. Each has the same characteristic stable flight no matter how rough the weather, and each has withstood the general perils of beginner's tow-launching with flying colours. Quick recovery after a stalled launch is one of its finer points, whilst perfect overhead tows are possible, due to the relationship of the hook and CG positions.
Construction is really simple. Fuselage sides are made over the plan, then joined at the rear and by the weight box formers. Spacers and towhook assembly are then fitted, noseblock and sundry sheeting completing the job ready for covering. Ribs are best cut with the aid of a standard template, then the wing can be built, centre section first then the outer panels. Spars are fitted after all three sections have been joined with braces at leading and trailing edges, tips being raised 5-1/2 inches. After adding dihedral braces and sanding edges to shape, cover with heavyweight Modelspan for maximum strength.
Tailplane and fin need no explanation, the underfin arrangement being employed for easy towing and simplified DT fitting. Cover the tail with lightweight tissue. About 25° rudder offset will be suitable for initial trimming, the auto-rudder system being set so that on tow, the rudder is pulled neutral by the towing ring on the aluminium tube over the towhook. The de-thermaliser is the simplest form of tip-up tail, with fuse operation, one limiter cord is needed to restrict the tip to 55° maximum angle.
Balance with the aid of weight in the nose box, until the C.G. is at the indicated point. Then seal off the weight box, and use tail incidence only for all further trimming. Short towline (50 ft) flights will soon find the best rudder and tail settings, then make a few full-length tows. If the CG is too far forward, or the hook is too far back, then towline stability will suffer - so keep to the plan and you'll have trouble-free gliding."
Quote: "Steve, I saw a picture of this model on a popular forum a couple of weeks ago. Since it was not listed here on the Outerzone, or anywhere else that I could find, I began a search for the AreoModeller issue that contained the plan. I found it right away, bought the magazine, and once it arrived, scanned and scaled the plan. This is from the June, 1953 issue of AeroModeller Magazine, designed by J. R. Holt. Best Regards,"
Direct submission to Outerzone.
Update 08/10/2015: Replaced this plan with a clearer copy (patterned background removed) thanks to TonyP.
Update 13/10/15: Added CAD tracing in .dwg format, produced using DraftSight, thanks to ColonelBlink. "All parts should fit correctly, but as ever any user is advised to measure twice & cut once!!!"
Update 28/07/2017: Added PDFvector plan tracing, thanks to hogal.
Supplementary file notes
Article, thanks to RogerClark.
Previous scan version.
PDFvector plan tracing.
This plan is available for download in CAD format.
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- Corsair (oz5735)
- Plan File Filesize: 278KB Filename: Corsair_glider_48in_oz5735.pdf
- Supplement Filesize: 319KB Filename: Corsair_glider_48in_oz5735_article.pdf
- Supplement Filesize: 1370KB Filename: Corsair_glider_48in_oz5735_previous.pdf
- Supplement Filesize: 133KB Filename: Corsair_glider_48in_oz5735_vector_hogal.pdf
- CAD Zip Filesize: 59KB Filename: Corsair_glider_48in_oz5735_cad.zip
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