
The S.I was the first real flying training aircraft designed by Platz, accommodating pupil and instructor side by side. It was developed from the V.43. The aircraft was purchased by the US Army Air Service and designated TW 4.

The S.I was the first real flying training aircraft designed by Platz, accommodating pupil and instructor side by side. It was developed from the V.43. The aircraft was purchased by the US Army Air Service and designated TW 4.