Are you working on some book etc? I have a fairly big interest in the danish D.21. Could u confirm if it was designated IIIJ as stated by the danish air force museum? Also do u happen to know what bombs it could carry (if any) and were the aircrafts hardpoints were located etc?Quite a lot of hours (Saturdays) researching at the Danish National Archive (Rigsarkivet) in Copenhagen. And a lot of years researching into the Hærens Flyverkorps, later Hærens Flyvertropper and Marinens Flyvervæsen flying equipment.
I'm highly interested in this 23mmx20mm configuration since I've never come across anything about 23mm cannons on the IIIJ until now. Do you have some more in-depth knowledge on these tests with the 23mm mounted?Hi Justo.
Thanks for your feedback, you seem to know very much of the danish situation these days, but unfortunately all is known facts to me, as I have been investigating into the Hærens Flyvertropper and Marinens Flyvervæsen for almost 30 years now.
A couple of updating facts.
There was 7 Fokker D.XXI ready for active service on April 9th. 1940. Two others was missing a tailwheel and a fueltank. The one with the lovest flying time had only 15 minutes in the log including testflight and transport from Kløvermarken to Værløse, so wery untested equipment.
D.XXI J-42 did not have two 23mm. Madsen macnine guns under its wings when testing, but one 20mm. and one 23mm. canon as the Hærens Flyvertropper wanted to test the reliability, functionality and service ability for each veapon. In the end, the 20mm. canon proved much more reliable than the 23mm. and thus was chosen for the task. For some reason, political I guess, the ordered 24 pcs. of 20mm. Madsen machine guns and ammunitions was never delivered from the factory. The D.XXI fighters was camouflaged, had 6 roundels (Danish markings) and 6 danish split flags on all surfaces on the tail to show neutrality.
So has all fighting aircraft, the Gloster Gauntletts, the Fokker C.V. as wel. The training and liason aircraft still was silver doped.
The Marinens Flyvervæsen had two torpedo amphibian planes, several Heinkel HE-8 and the Gloster Gauntlet fighters on strength.
The P4/34 project was planned and production started (beginning) and 12 Rolls Rouce engines had been purchased as well. One of the Marine pilots was also testing the D-XXI with only one canon firing as the navy wanted to equip the P4/34 plane with one 20mm. Madsen machine canon in one wing and 4 Madsen 8mm. Machine gun in the other.
The two (not one) Cierva C.30 autogyro was already grounded as they were unflyable for the pilits and usually enden in a crash when starting or landing.
There was two (not one) de Havilland Dragonfly liason plane on strength. At the outbreak of the was one was in Jutland.
Hærens Flyvertropper never had realistic plans for further Fokker D.XXI fighters as the political landscape was against strengthen the military.
Two Heinkel HE114 was ordered from Heinkel and a contract was signed on April 1st. 1940, but cancelled about 14 days later.
There was drawn up a contract for 12 Macchi M.C.200 from Italy, but never signed. The Macchi M.C.200 fighters would have been delivered unarmed so either way the Marinens Flyvervæsen would have needed to test and decide for a danish armamant of Madsen origin.
A license contract for 12 Fokker G.1 recon/bommer/heavy fighter was signed and several workers was at the Fokker factory to learn to build the plane. Engines was a pain point as Bristol engines was not available. There were plans to acquire further 12 Fokker G.1 from Fokker in Holland and even to build a further 12 Fokker G.1 planes, but they were plans only.
The Marinens Flyvervæsen fighter project was a one plane only project, thus with several fuselage designs and two different wing arrangements, a straight and a gull wing design, but is was only "emergency thinking" as there were no funds and no political backing the project. With the size of the plane, the armament of 4 8mm. Madsen machine guns with plenty of rounds would save no space for bombs or other ordonance. The fuel capacity would have been very small as the fueltank was positioned in the opper fuselage in front of the cockpit behind the firewall. Not at all a fighter project that could have made any difference in a war, but might have had some effect when training student pilots.
Hi.Are you working on some book etc? I have a fairly big interest in the danish D.21. Could u confirm if it was designated IIIJ as stated by the danish air force museum? Also do u happen to know what bombs it could carry (if any) and were the aircrafts hardpoints were located etc?Quite a lot of hours (Saturdays) researching at the Danish National Archive (Rigsarkivet) in Copenhagen. And a lot of years researching into the Hærens Flyverkorps, later Hærens Flyvertropper and Marinens Flyvervæsen flying equipment.
Et 7600 m2 stort, moderne og levende flymuseum med 50 danske og udenlandske luftfartøjer fra 1911-2000. Bl.a. svævefly, veteranfly, jagerfly og helikoptere.flymuseum.dk
Great info. Did the DAF ever designate it? Like would it have been something like IB?Yes, I wrote a small book about it
Short recap. Hærens Flyvertropper ordered a license to build 12 Fokker G.1, and did send a number of workers to the Fokker Factory to learn how to build the plane. Fokker forwarded a bunch of drawings, 5.000+, of which no signifikant number of drawings exist to my knowledge. Hærens Flyvertroppers Værksteder started to redraw all the drawings to Danish standard and did start som very simple wood working tests, BUT no real production was ever started. The 12 planes was supposed to have two Bristol Mercury V.III engines, but due to the coming war, it was not possible to acquire these engines from England, so both the Focke Wulf 801 engine, a couple of Italian radial engines and even an American engine was considered, but no real action done.
The Danish Fokker G.1 should fill the position of both a recon. plane, thus the "glasshouse" fuselage underside for all planes (It was interchangeable with fx. the bomb rack system), and as a heavy fighter and a bomber plane. The bomber plane should have dive-brakes under the wings outside the engines.
The were supposed to be armed with two 20mm. Madsen canons and two 8mm. machineguns in the nose and a reward firing 8mm. Madsen machinegun in the rear fuselage.
The political landscape and the lack of funds for defending Denmark was most likely the reason for the planes fate, as no real production ever was started.
Even though, in Hauptman Falcks notes for the attack on Værløse airfield, it is mentioned that the Danes have been building the Fokker G.1, but that it was not on strength yet, though he should be aware that one or two might be active on the airfield. Looking at the attach plan for Weserübung, the German research was not very good at they totally did forget the Marinens Flyvevæsen planes, the Havker Nimrods, HE-8 etc.