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Presentation to the MacDonald College

 

Flight tests were continued without correcting this condition as time before the end of the season was limited and more flight data would be a useful basis for changes.

 

Elevator control was sensitive, with almost instantaneous response, a characteristic of tailless configuration due to low pitching moments of inertia and low aerodynamic damping in pitch.

 

Roll response was lively with an estimated 4 seconds to roll through 90 degrees at 50 miles per hour airspeed.

 

Directional stability was about normal, disturbances set up by kicking rudder or suddenly releasing the full rudder were highly damped.

 

Drag rudders used as spoilers were not as effective as might have been desired. A very steep approach could be made by sideslipping, a manoeuvre which is safe to use on approach to landing because of the way the BKB returned smoothly to unyawed flights.

 

The aircraft proved to be easy to land. Good landings were made over the wide range of touchdown speeds with no tendency to purpoise or nose over.

 

The stalling characteristics were not fully explored on these preliminary flight tests. When the stall was approached by gently reducing airspeed, only a controlled mush resulted.

 

Tufts showed separation beginning at the wing root, near the trailing edge and spreading spanwise.

 

The BKB group was successful in building a sailplane which was easy to handle and rig, and, except for the difficulty with trim to be remedied, had satisfactory handling characteristics.

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