Arup S-4
The Arup S-4 (Model 104) is the last in a series of round-wing aircraft from C.L. Snyder. == Design and development == The S-4 was engineered by Raoul Hoffman.
The Arup S-4 (Model 104) is the last in a series of round-wing aircraft from C.L. Snyder. == Design and development == The S-4 was engineered by Raoul Hoffman.
The Arup S-4 (Model 104) is the last in a series of round-wing aircraft from C.L. Snyder. == Design and development == The S-4 was engineered by Raoul Hoffman.
Source: Wikipedia "Arup S-4" · CC BY-SA 4.0
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