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Stroop SP-7 X-wing
 
 Stroop-XWng-01
 
The Robert C. Stroop SP-7, created in 1940, was to combine the biplane’s landing characteristics and the monoplane’s speed characteristics.

 

Stroop-XWng-02

 
On the runway the wing is in the X-wing position, and when in the air the wings are retracted to the monoplane position, the wheels automatically retracted.
 
Stroop-XWng-03
 
 
 
 


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