Fokker S.IX 1937

The S.IX biplane was developed in 1937 as a training aircraft for initial training and as an aerobatic aircraft. Two versions were built in series in Amsterdam, one with the 165 hp Armstrong-Siddeley Genet Major radial engine, and one with the 168 hp Menasco Buccaneer inline engine. The Prototype of the S.IX had the registration X-3.

The Aviation Department at Soesterberg replaced the S.IV aircraft in use with twenty S.IX with Genet Major engines. These radial engines were built under license by Kromhout in Amsterdam.

The Royal Netherlands Navy purchased fifteen Menasco Buccaneer S.IXs for its initial pilot training for the MLD.

After the war, three S.IXs with Kromhout Genet Majors still present were built and delivered to Frits Diepen Aircraft at Ypenburg.

The 1937 prototype to be delivered to LVA and MLD.

An important difference with the predecessors is the raised position of the stabilizer and elevator.

The registration will be the X-3 for the time being.

Now shown as 31 at the LVA.

In the same situation as 31.

The tail no longer has red white blue painting.

Immediately after the 2nd World War, 3 more S.IX/1 aircraft are built.

They get the registrations PH-NAR, PH-NAS and PH-NAT.

The engines are again the 165 hp Armstrong Siddeley Genet Major.

They will be painted red and will have the text “Frits Diepen Aircraft”, next to the registration.

Later they go to Aero Holland NV in Ypenburg.

They will do sightseeing flights there.

Both before 1940 and after 1945 S.IX/1 aircraft must have been built under license at Kromhout Amsterdam.

This also applies to licensed production of the Armstrong Siddeley Genet Major engines.

Simple drawing with clear indication of the main parts of a S.IX.

This S.IX/1 is one of the 'Frits Diepen aircraft' built in 1946.

After the prototype of the S.IX /1, the first series machine in 1937 was the S.IX/2. This is intended for the MLD, Naval Aviation Service.

Here still equipped with a traditional, lower-mounted stabilizer and elevator.

Registered as S-20 as first of 27 units ordered.

About 17 were eventually delivered as S-20 to S-36.

The MLD planes are equipped with a Menasco Buccaneer engine of 168 hp.

From the S-21, Fokker will build the S.IX with the raised stabilizer.

Here the S-22 of MLD.

The S-20 with the right stabilizer.

The S-20 in full flight.

The S-20 on the ground.

Five S.IX/2 training aircraft from MLD in 1938.

The photo was almost certainly taken at De Kooij naval airfield.

The first from the left is the S-34 and to the left of the hangar is another new one under construction.

The S-23 ready for take-off with the instructor almost in place.

The front cockpit is still empty.

The engine is started in this way at the front.

The place of action is probably Soesterberg airport.

The Menasco Buccaneer motor of the MLD version does give a nice slim look.

The Armstrong Siddeley Genet Major engine from LVA gives the front a somewhat clunky appearance.