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Presentation to the MacDonald College

 

Apparently, that approach is shared with the others. Last year, we learned of a similar development, also aiming to improve the 15 meter class, being conducted by the Akademische Fliegergruppe Braunschweig in Germany.

 

After 6 years of work, their SB-13 Nurflügler, or flying wing, reached the flight test stage. Performance gains were confirmed but some serious deficiencies of flying quality also become evident.

 

I shall only briefly describe the evolution of thought guiding our own work. The reduction of components started with an attempt to accommodate the prone pilot in an effort to reduce frontal area.

 

But, what was feasible for the large, slow flying Hortens with its 5 ft. chord, makes no sense for a modern sailplane whose root chord is half that length. Try as you may, you would end up with a sizeable bulge. The provision of visibility would ruin the airfoil shape as was the case with the Horten. Head first landings would be the cause of unnecessary excitement.

 

The model, that you see now, illustrates the next attempt in which we are trying to accommodate the pilot in a supine position. The height of the nacelle is only 26 in. The sparcaps are separated vertically across the cabin offering a through space for pilots legs, and for the leading arm suspension of the retractable main gear.

 

The wing panels divide in centre plane, nacelle splits at the bulkhead. The structure could be light but poor visibility defeats the concept. The manufacture of distortion free glass panels would be a problem in itself.

 

The next model accommodates the pilot in a conventional-semi reclining position thus adding 4 inches to the vertical dimension. We accepted defeat not being able to reduce frontal area.

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