Shipbucket

I'd like to present you some figher plane I've been working on for quite a while in "adapted for SB" Pixel Marshals/Junior General scale which are 2 times bigger then FD. Big thanks to lads from Pixel Marshals and Junior Generals from Deviant arts for letting me using their scale for potential adaptation and further use in Shipbucket

M4K1 Martlet is a Dutch carrier based fighter, all metal monoplane of The Second Great War which is generally viewed as one of the best if not the best Dutch fighter plane United Kingdom of Netherlands and Wallonia made for run up of the conflict, it proved it self serious opponent for Japanese A6M Zero until United States introduced F6F Hellcat and F4U Corsair. Dutch Forces had this plane in service from very first day of the war and it would serve the crown until 1948 with various modifications made during it service, it was also main carrier based fighter for the British until 1943.
M4K1 MkIIIa
Crew: 1
Length: 9.60 m
Wingspan: 10 m
Height: 2.92 m
Empty weight: 2,752 kg
Gross weight: 3,368 kg
Powerplant: 1 × R-2600 14-cylinder air-cooled radial piston engine, 1,550 hp
Propellers: 3-bladed constant-speed propeller
Performance
Maximum speed: 610 km/h below 6,200 m
(never exceed speed - 810 km, maximum speed at horizontal flight at low altitude (below 6,200 meters) - 512 km/h)
Take off speed: 140 km/h
Range: 600 km + 170 km with fuel tank
Service ceiling: 10,300 m
Rate of climb: 18.4 m/s
Time to altitude: 5,000 m in 4 minutes 28 seconds
Max rate turn: 16.4 seconds
Armament

Guns: 6 Browning FN-37 MKIII 13.2 milimitre Machine guns at the wings 250 rounds for 4 inner and 150 for 2 outside machineguns.
Bombs: 2 × bombs up to 100 kg each, or single 250kg bomb

Produced - 3563


Development
As soon as Fokker D XXI took entered production and was brought to service by both Koninklijke Nederlands-Waalse Landmacht Luchtdienst (Royal Dutch-Wallonian Army Air Service) and Koninklijke Nederlands-Waalse Marine Luchtvaartdienst (Royal Dutch-Wallonian Navy Air Service) the army and navy were beginning to think of possible replacement of Fokker D XXI, Defence ministry released specifications calling for a modern, all metal plane with retractable landing gear, capable of hitting 570+km/h at 5000 meters and a climb to 5000 meters in 10 minutes, that would also be fairly maneuverabile and could be based on aircraft carriers
In September 1936 work had began and developmental hell followed both companies couldn't find suitable engine in Netherlands, Fokker bought a license for Hispano-Zuiza 12Y-31 engine, while Koolhoven used Bristol-Taurus. By April 1938 both companies made first prototypes and 2nd. Fokker's prototype FrMSF-212 took off and performed relatively well, but Koninklijke Nederlands-Waalse Marine Luchtvaartdienst were not satisfied with its maneuverability and its unreliability, navy did not accept it, though the army showed interest in Fokker's plane and later on would except it when Fokker fixed all the issues with it as a long range interceptor known as Fokker D XXII
Koolhoven's KMSF-45 prototype took off week later and Navy did like it, though it wasn't fast as they wanted (reaching 510 km/h) Koolhoven redesigned the fuselage to fit American R-1830 engine which became available, added drop shape canopy and leading edge slat to help with climb and increasing maneuverability slightly. Plane reached speed of 540km/h at height of 5100 meters, at higher altitude speed dropped to 300-410 km/h, KnMF proved to be very, very good and modern aircraft and it was designated as M4K1 (Marine (naval fighter) 4 Koolhoven's model 1) while standard disegnation was Fighter Koolhoven 58 year's type (age of current monarch that being Queen Wilhelmina), later on it was nicknamed by army and later navy as "Martlet".
KMSF-45 (M4K1 Prototype)


Service History
Production began In January 1st 1939
With 790 produced on outbreak of the World War 2. Before the war however 24 M4K1s were send into China as volunteer force with 450 Dutch Serviceman known as LVG-1 "Sky Dogs" (Luchtvaartgroep-1) under command of L.H. van Oyen, here career of best Dutch Ace - Tim Van Vesser starts who during his service in LVG-1 shot down 14 enemy aircraft, at June 2 1939 Martlets scored first air-to-air victory when 12 M4K1s led by lieutenant August Diebel attacked 18 Japanese Ki-27 and 6 A5M Japanese claimed that only 14 planes were shot down (13 Ki-27 and 1 A5M) and scoring 2 losses on Dutch while in actuality none of the August Diebel's planes were down though they sustained some damage and shot down 16 Ki-27 and 3 A5M
By the time they were called out back to Netherlands and were divided into various Dutch Aircraft Carriers. Martlets shot down 188 aircraft while loosing only 2 from June to September 1939

At the time of German Invasion of Poland 821 M4K1 were active, the modification of a figher was in a process and M4K1 MkII would be brought in mid September but wasn't since German Bombing of Koolhoven's Factory in Rotterdam delayed it until End of October, main changes of the MkII was slightly more powerful engine with higher speed performance. During Battle of Netherlands, France and Britain The Martlet quickly gained a fearsome reputation among German fighter pilots (more then Supermarine Spitfire). Thanks to a combination of good maneuverability – compared to contemporary Axis fighters – high climb rate and speed as well as excellent armament. It proved a difficult opponent even for the Bf/Me109s.
After fall of UKNW and France production was moved into USA but main production line was located in Kaap (South Africa) In 1942 old MkII had major problems in fighting German FW-190 and Italian Re. 2005s as they were faster and had better climb rates and the need of modification of the plane was understood at the end of 1940 - next MkIII were re-engined to American R-2600, completely redesigning cooling system and radial systems this resulted increasing of speed and climb but traded off manoeuvrability slightly (as good as Spitfire MkIV), 2 variants were made - MkIIIa which carried only 6 50 cal machineguns and MKIIIb which would carry 2 50 cal and 2 20 mm British-Hispano cannons though due to reliability of earlier 20 mm British-Hispano pilots preferred MKIIIa and generally MkIIIa firepower was deemed sufficient.

In Pacific M4K1 were the only Allied Fighters which could fight toe-to-toe with Japanese A6M Zero until introduction of F6F by US. M4K1 were loosing in manoeuvrability but surpassed them in climb-rate, speed and better survivability (possessing self-sealing fuel tanks and 8 mm plate for pilot) this remained as such all the way until Japanese surrender in December 1944, MkIIIs were the main workhorse of Dutch, British and Australian airforces participating in every South Pacific engagement. After Japanese surrender work had began on last MkIV modification which would fight in Europe for a short time.
In the aftermath of The Second Great War, the Dutch Royal Airforce consolidated much of its wartime combat force and selected the M5KF2 (Marine model 5, Koolhoven-Fokker model 2) as a "standard" piston-engined fighter, while, M4K1 were given substantially reduced roles such as training for example.

Variants and specifications

M4K1 MkI (January 1939)
Crew: 1
Length: 8.50 m
Wingspan: 9.8 m
Height: 2.65 m
Empty weight: 2,006 kg
Gross weight: 2,868 kg
Powerplant: 1 × R-1830 14-cylinder air-cooled radial piston engine, 1,040 hp
Propellers: 3-bladed constant-speed propeller

Performance
Maximum speed: 540 km/h below 5,200 m
Take off speed: 130 km/h
Range: 600 km + 150 km with fuel tank
Service ceiling: 10, 300 m (36,000 ft)
Rate of climb: 12.6 m/s (3,290 ft/min)
Time to altitude: 5,000 m (16,404 ft) in 6 minutes 48 seconds
Max rate turn: 15.7 seconds
Armament

Guns: 4 Browning FN-37 13.2 milimitre Machine guns 250 rounds each.
Bombs: 1× bomb up to 100 kg.

Produced 1233

M4K1 MkII (October 1939)
Crew: 1
Length: 8.60 m
Wingspan: 9.9 m
Height: 2.65 m
Empty weight: 2,142 kg
Gross weight: 2,968 kg
Powerplant: 1 × R-1830 14-cylinder air-cooled radial piston engine, 1,340 hp
Propellers: 3-bladed constant-speed propeller
Performance
Maximum speed: 570 km/h at 5,400 m
Take off speed: 134 km/h
Range: 620 km + 150 km with fuel tank
Service ceiling: 10,300 m
Rate of climb: 14.7 m/s
Time to altitude: 5,000 m in 5 minutes 47 seconds
Max rate turn: 15.4 seconds
Armament

Guns: 4 Browning FN-37 13.2 milimitre Machine guns at the wings 250 rounds each.
Bombs: 2 × bombs up to 100 kg each or single 200 kg.

(No Visual outside differences from MkI and MKII)
M4K1 MkIIIb (January 1942)
Crew: 1
Length: 9.50 m
Wingspan: 9.8 m
Height: 2.78 m
Empty weight: 2,800 kg
Gross weight: 3,450 kg
Powerplant: 1 × R-2600 14-cylinder air-cooled radial piston engine, 1,550 hp
Propellers: 3-bladed constant-speed propeller
Performance
Maximum speed: 600 km/h below 6,200 m
Take off speed: 143.5 km/h
Range: 600 km + 170 km with fuel tank
Service ceiling: 10,300 m
Rate of climb: 17.3 m/s
Time to altitude: 5,000 m in 4 minutes 28 seconds
Max rate turn: 16.4 seconds
Armament

Guns: x2 20 milimitre Hispano-Suiza auto-cannons, at wings, 100 rounds each, x2 Browning FN-37 13.2 milimitre Machine guns at the wings 250 rounds each
Bombs: 2 × bombs up to 100 kg each.

Produced - 1450 planes

M4K1 MkIV (April 1943)
Crew: 1
Length: 9.55 m
Wingspan: 10 m
Height: 2.80 m
Empty weight: 2,909 kg
Gross weight: 3,668 kg
Powerplant: 1 × R-2600 14-cylinder air-cooled radial piston engine, 1,750 hp
Propellers: 4-bladed constant-speed propeller
Performance
Maximum speed: 665 km/h at 6,200 m
Take off speed: 160 km/h
Range: 500 km + 170 km with fuel tank
Service ceiling: 10,300 m
Rate of climb: 21.2 m/s
Time to altitude: 5,000 m in 4 minutes 33 seconds
Max rate turn: 17.0 seconds
Armament

Guns: x2 20 milimitre Hispano-Suiza auto-cannons 100 rounds each at wings x4 Browning FN-37 MkIII 13.3 milimitre Machine guns at the wings 250 rounds 2 at fuselage and 2 at wings.

Produced 610 planes

impressive

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Thanks, perhaps could be better with MkIV wanted to do Spitfire MkV trop style radiator.

by the way finalized template

was bit bored and made 'M4K1 MkIII' in other Air Forces/Sevices. might do same stuff for MkI/II but kinda lazy and perhaps it wont be that different as this one
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Soviet Lend-Leased planes: While UKNW Indeed had logistical issues supplying their airforce and military (and navy) in general after fall of Netherlands in march 1940, with Soviet entry in World War II and start up of Lend-Lease program by United States in 1942 some of the Dutch aircraft specifically M4K1 MkIIs and MkIIIa and b's were shipped into USSR in total 367 aircraft succesfully entered Eastern front out of 570 which should have been delivered (203 were lost due to German U-Boat campaign (40% of the losses were lost during PQ-17 tragedy). of 297 aircaft 72 were M4K1 MkIIIa, 35 MkIIIb, 120 MkII other 70 were bombers, transports (licenced DC-3) and scouts.
Dutch Martlets were nickamed by Soviet pilots as "Воробей" (Sparrow) and overall planes were received well by pilots in the south areas of the front (Stalingrad, Causcasus, Ukraine but were heavily criticized dutch airplane by the pilots and engineers who operated in the northern parts of the country especially during winter, oil radiators and engine got frozen at -32 °C (M4K1s in the Stalingrad sector suffered same issue since keep in mind in end of December of 1942 and all January of 1943 remperature in the area varried from -35 to -42 °C), MkIIIa variant were preferred over MkIIIbs for its 6 50 cal machineguns which Soviet Pilots loved more then Berezin 12.7 mm. Regarding performance M4K1 were compared to Soviet La5s due to its similar engines and overall look, Soviet pilots noted that the M4K1 operated well at altitudes below 6000 m didn't suffered from short range like La5 did. featured engine computer and 2 stage supercharger, It's all-metal design was also heavily appicieted as apposed to La5's partial wood construction as well as its naval fighter design gave lessons for demestic aircraft design and especially for Soviet Carrier based aircraft which became to be in 1947 with commisioning of Soviet Aircraft carrier "Karl Marx" and seizeure of German Graf Zeppelin which would be ranemed to "Engels".
due too harsh conditions of eastern front none of dutch M4K1s survived the war, but in 2019 Ukrainian mountaineer Stepan Radchenko found a wreck of ST-227 (board number) M4K1 MkIIIa 17 km south from village of Vyshkiv which is 80 km away east of Ivano-Frankivsk, parts and wreckage has been salvaged and brought back to United Kingdom of Netherlands and Wallonia which is undergoing full restoration process to a flight condition.

T-DB5K2 "Wasp" was royal dutch navy's first carrier based 3 seat Torpedo-Dive Bomber designed by Koolhoven, which was a main carrier strike plane for Royal Dutch Navy up until early 1943 which was later replaced by T-DB6KF2
Crew: 3 (Pilot, Navigator/Radio operator, Gunner)
Length: 10.3 m
Wingspan: 13.95
Height: 3.5 m
Empty weight: 2,812 kg
Gross weight: 3,850 kg
Powerplant: 1 × R-1820-52 9-cylinder,single row, air-cooled radial piston engine, 910 hp, later engines could produce 1110 hp.
Propellers: 3-bladed constant-speed propeller
Performance
Maximum speed: 440 km/h below 4300 m
Cruise speed: 256 km/h
Take off speed: 190 km/h
Range: 1340 km
Service ceiling: 9,400 m
Rate of climb: 8.1 m/s
Time to altitude: 4,000 m in 8 minutes 28 seconds
Max rate turn: 29.2 seconds
Armament

Guns: 2 Browning FN-32 7.7 milimitre Machine guns at the wings 400 rounds for, single rear 13.2 M2 Browning FN-38 Machine gun mount for gunner.
Bombs and torpedoes: 1st load: load one - single 700 kg Type 38 AP bomb (modefied from 15" Mk1 Naval gun shell), load 2 - single 500 kg HE Type 37, load 3 - 8 50 kg bombs, load 4 - either 700 kg AP or single 500 HE bomb with 2 additional 50 kg bombs


Development
The Wasp's story starts in 1937, Dutch main striking force for aircraft carriers were TB4K1 a torpdeo bomber and DB3F3 a dive bomber, Karel Doorman who was the main attorney for naval aviation in Royal Dutch Navy pushed for a 2 and then 3 seat multi purpose aircraft, his initial dream was of "All 3 in one package" concept - a fighter, torpdeo and dive bomber but very well understood that technolegy of 1930's wouldn't bring such aircraft, so instead he was succesfully developed a concept of 3 seat torpdeo dive bomber. In June 1936 under influence of Karel Doorman Dutch Naval Minestry issued specification T-14/20 for a monoplane carrier-based dive bomber to replace the existing biplanes then in service. Fokker, Pander and Koolhoven all submitted designs, with the former two subsequently being asked for two prototypes each.

The Koolhoven design started with low-mounted elliptical wings inspired by the Heinkel He 70 Blitz. It flew slowly enough that the drag from the landing gear was not a serious issue, so fixed gear was used for simplicity. The aircraft was to be powered by the 720 hp Bristol Pegasus nine-cylinder radial engine.

The first prototype was completed in November 1937, and flight trials began a month later, after which it was designated as T3K1. Initial tests were disappointing. The aircraft was underpowered and suffered from directional instability in wide turns, and in tighter turns it tended to snap roll. The dive brakes vibrated heavily when extended at their design speed of 370 km/h, and the Navy was already asking for a faster diving speed of 430 km/h.

The second aircraft was extensively modified before delivery to try to address the problems. Power was increased by replacing the 830 hp R-1820 in a redesigned cowling, and the vertical tail was enlarged to help with the directional instability. The wings were slightly larger in span and the outer sections of the leading edges had wash-out to combat the snap rolls, and strengthened dive brakes were fitted. These changes cured all of the problems, and it was enough for the T3K1 to win over the Fokker's T3F4

In January 1938 Navy ordered Koolhven's aircraft under disgnation of T-DB5K2 (Torpedo-Dive Bomber Type 5 Koolhoven Model 2).
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gonna write Service history in SB wiki, or perhaps elsewhere since it isn't official SB scale at all