The De Schelde S-21 was a radical fighter designed in the Netherlands in 1938. It was nearing completion in May 1940 when the Netherlands was invaded by Germany and the sole prototype was tested by the Germans.

The Dutch ship building company De Schelde established an aircraft construction section in 1935. For it T E Slot designed a number of aircraft, most of which did not enter production.

One of the later designs was a single seat interceptor and ground attack fighter designated the S-21.

Design commenced in 1938 and construction was started in early 1939.

Construction was almost complete when the German Army occupied the De Schelde factory in May 1940 and the S-21 was taken to a test facility at Utrecht where it was completed and tested to destruction.

Drawings of the S-21 were later published in German magazines where it was described as a Focke Wulf Fw189.

This represents the sole S-21, c.May 1940.

RS Models 1/72 kit. Completed in August 2008.