It was built c. 1938 and was a small single - seat open cockpit biplane powered by a four - cylinder horizontally opposed engine .
The FB. 41 Rubis was the second and last of SCAL 's aircraft designs .
FB. 41 Rubis was built c. 1938 and was a small single - seat open cockpit biplane powered by a four - cylinder horizontally opposed engine .
The FB. 41 Rubis was the second and last of SCAL 's aircraft designs .