WesWorld

Dutch Aircraft of 1934
There are several Dutch Aircraft which will tentatively enter service in 1934.

Storyline has Fokker switching to all-metal in 1930, tapping Avia and Fokker-America for technical help, this as a result of the success of the flush-riveted, all metal Baron.

Generally speaking, I use real/planned Fokker/Avia/Fokker-America/Koolhoven craft as starting points for basic dimension, and then tweak to fit. If a critical dimension is missing - for example the wingsweep on a D.XIV (used as basis for D.XIX), or fuselage diameters, I try to scale from an image or drawing, or take engine dimensions and add a couple inches for cowling. Engines are generally from Wikipedia or other web sources, one of which seems to have already folded.

Cleanness value now comes from the typical value of +5 years. Unstreamlined section is either the suggested for radials, or ~1/3rd for inlines. Previously I was using +15-20% and default, respectively.

All performance specs are always at max weight.

The designs in the following posts are :
D.XIXb fighter 1934 production.
C.11W floatplane 1934 production


G.1 aircruiser 1933 prototype.
T.VIIIW sea plane 1934 prototype
Fk 58 fighter 1934 prototype
D.23 fighter 1934 prototype
Koolhoven F.K.55 1934 prototype

1934 Production Aircraft

The Fokker D.XIXb

The D.XIXa entered service in the fall of 1933, after a pre-production model competed at Talons. The D.XIXb will the primary production verision of the D.XIX series, and is both carrier and rough field capable, which the D.XIXa is not. The D.XIX series is of course the updated D.XIV, a 1925 swept wing monoplane with a Hispano engine. The degree of wingsweep and dimensions of the oval fuselage came from a scan of a model box I found.

The DXIV :



The D.XIXb has a fractionally larger fuselage, which hosts the bolstered landing gear and tailhook and a slightly larger wing to maintain wingloading comparable to the D.XIXa. Additional attention to streamlining has produced incremental improvements that offset the 3% weight gain.

Aircraft Type or Name:

Fokker D.XIXb

General Type:
Airplane = 1
Airship = 2
Orbiter = 3
1

Year of First Flight: 1934

Description

Carrier or Rough Field
Monoplane
Conventional Fuselage

A reworked Fokker monoplane in response to the I-100 Barron 2x13.2mm MG, 2x7.92mm, radio. Production Carrier version.



Characteristics:

Weight (maximum) 4,625 lbs
Weight (empty) 4,060 lbs

Length 25.9 ft
Wingspan 35 ft
Wing Area 226 sq ft
Sweep 18 degrees

Engines 1
Hispano-Suiza 12Y-brs
Piston

867 hp
at 12,000 ft


Crew 1


Typical cost $0.025 million in 1934
Total number procured 144


Performance:

Top Speed 281 kts = 323 mph
at 12,000 ft
Mach N/A

Operational Ceiling 37,950 ft

Range 405 nm = 466 miles
with 3 lbs payload
3 lbs released at halfway point

Climb 2,460 fpm

Cruise 150 kts = 173 mph
at 12,000 ft

Corner Speed 239 KIAS =
286 kts at 12,000 ft
Mach N/A
Turning Rate 35.5 deg/sec
Radius 1,561 ft



Internal Data:

Intake / Fan Diameter 7.6 ft

Bypass Ratio 83.51

Engine Weight 1036 lbs
Overall Efficiency 23.5 percent

Structural Factor 1.00

Number of Wings 1
Number of Fuselages 1

Limiting Airspeed 375 kts
Wing Ultimate g Load 15.00 g
Wing Taper 0.3
Wing Thickness at Root 1.4 ft

Tail / Canard Factor 0.4

Number of Nacelles 0
Length 6 ft
Diameter 3 ft
Fullness 0.5

Fuselage Diameter 3.3 ft
Fuselage Fullness 0.4

Pressurized Volume 0 percent
Cargo Decks 0

Cleanness 79 percent
Unstreamlined section 1.6 sq ft

User equipment 525 lbs




C.XIW Floatplane

The C.11W is to take the place of the C.4W & 7W floatplanes currently fielded on Dutch naval vessels.
The C.11W is based on the 1935 plane, with the same Bristol Pegasus III engine. All metal construction is once again used.



Armament is expected to be 4x 7.92mm MG forward, and a twin ring-mounted 2x 7.92mm MG aft. While the 1918 GAST twin MG is being looked at for such applications where more firepower is desired from a limited area (including the aft G.1 turret), it is not currently in use.

Aircraft Type or Name:

Fokker C.11W

General Type:
Airplane = 1
Airship = 2
Orbiter = 3
1

Year of First Flight: 1933

Description

Flying Boat / Seaplane
Biplane
Conventional Fuselage




Characteristics:

Weight (maximum) 5,621 lbs
Weight (empty) 4,362 lbs

Length 34.1 ft
Wingspan 43 ft
Wing Area 295 sq ft
Sweep 1 degrees

Engines 1
Bristol Pegasus III
Piston

764 hp
at 12,000 ft


Crew 2


Typical cost $0.019 million in 1934
Total number procured 144


Performance:

Top Speed 227 kts = 261 mph
at 12,000 ft
Mach N/A

Operational Ceiling 36,500 ft

Range 756 nm = 871 miles
with 96 lbs payload
103 lbs released at halfway point

Climb 1,692 fpm

Cruise 140 kts = 161 mph
at 12,000 ft

Corner Speed 188 KIAS =
225 kts at 12,000 ft
Mach N/A
Turning Rate 36.1 deg/sec
Radius 1,207 ft



Internal Data:

Intake / Fan Diameter 7.6 ft

Bypass Ratio 86.95

Engine Weight 1036 lbs
Overall Efficiency 22 percent

Structural Factor 1.00

Number of Wings 1.9
Number of Fuselages 1

Limiting Airspeed 250 kts
Wing Ultimate g Load 12.00 g
Wing Taper 0.1
Wing Thickness at Root 0.7 ft

Tail / Canard Factor 0.4

Number of Nacelles 0
Length 6 ft
Diameter 3 ft
Fullness 0.5

Fuselage Diameter 4.8 ft
Fuselage Fullness 0.5

Pressurized Volume 0 percent
Cargo Decks 0

Cleanness 60.4 percent
Unstreamlined section 2.3 sq ft

User equipment 497 lbs





1933-4 Prototype Aircraft






The Fokker G.1s.



All these are merely developmental right now, having flown in 1933. Historical craft was developed in March-Oct 1935.

The basic G.1 is the same as the historic plane, though armed with 8x7.92mm forward instead of 2x7.92mm MG+ 2x 23mm cannon. The tail turret with the 7.92mm MG is retained. In the later versions I will either increase Fuselage length or tail size add a bit more aft counterweight to the guns as historically they were nose heavy. A nose wheel is not out of the question but was not originally resorted to for service craft.

Basic dimensions come from http://www.dutch-aviation.nl/index5/Mili…ex5-1%20G1.html
Where information was lacking- like central nacelle size, http://www.umt.fme.vutbr.cz/~ruja/modely…okker-G1/G1.jpg was used for scaling.

I have planebuilders for a couple different versions. The FW-187 will likely capture the Zerstorer version, but the F/B / Night fighter / Mosquito-style roles will likely stay the G.1, and it may develop into a P-38 style over-water fighter later.

However, if the base version here passes muster those should as well once I settle on one to actually build.

Aircraft Type or Name:

G.1

General Type:
Airplane = 1
Airship = 2
Orbiter = 3
1

Year of First Flight: 1933

Description

Carrier or Rough Field
Monoplane
Twin Fuselage

Planebuilder SIM of Fokker G.1 Aircruiser to be used as a baseline. Weight includes 8x7.92mm MG forward, 1x7.92mm MG in rear turret. 50lbs is allocated for radio and whatever else.



Characteristics:

Weight (maximum) 10,560 lbs
Weight (empty) 8,067 lbs

Length 35 ft
Wingspan 54 ft
Wing Area 384 sq ft
Sweep 4 degrees

Engines 2
Hispano-Suiza 12Y
Piston

867 hp
at 12,000 ft


Crew 3


Typical cost $0.047 million in 1934
Total number procured 160


Performance:

Top Speed 269 kts = 309 mph
at 12,000 ft
Mach N/A

Operational Ceiling 36,250 ft

Range 756 nm = 871 miles
with 470 lbs payload
501 lbs released at halfway point

Climb 2,069 fpm

Cruise 150 kts = 173 mph
at 12,000 ft

Corner Speed 236 KIAS =
283 kts at 12,000 ft
Mach N/A
Turning Rate 28.8 deg/sec
Radius 1,904 ft



Internal Data:

Intake / Fan Diameter 7.6 ft

Bypass Ratio 82.3

Engine Weight 1038 lbs
Overall Efficiency 23 percent

Structural Factor 1.00

Number of Wings 1
Number of Fuselages 2

Limiting Airspeed 350 kts
Wing Ultimate g Load 12.00 g
Wing Taper 0.3
Wing Thickness at Root 2.25 ft

Tail / Canard Factor 0.4

Number of Nacelles 1
Length 19.5 ft
Diameter 3.75 ft
Fullness 0.4

Fuselage Diameter 3.5 ft
Fuselage Fullness 0.1

Pressurized Volume 0 percent
Cargo Decks 0

Cleanness 75.5 percent
Unstreamlined section 3 sq ft

User equipment 892 lbs

T.VIIIW

While armed Dornier 18s will replace some long range recon flying boats, the T.VIIIW is the follow-on to the T.IVa torpedo seaplane. This version has the same gross dimensions as the historical T.VIIIW, but has had it's max weight dramatically increased and the wing area as well to maintain the same wingloading- presumably important for seaplanes. The plane is again all metal, and bears the WW Dutch aerial torp of 820kg rather than the historical 750kg.



Aircraft Type or Name:

T.VIII W

General Type:
Airplane = 1
Airship = 2
Orbiter = 3
1

Year of First Flight: 1934

Description

Flying Boat / Seaplane
Monoplane
Conventional Fuselage

Fokker T.VIII Seaplane. Equipped with 2 twin 7.92mm MGs in power turrets nose / dorsal, radio and space for 1x 820kg 18" aerial torpedoes internally.



Characteristics:

Weight (maximum) 14,500 lbs
Weight (empty) 10,138 lbs

Length 42.6 ft
Wingspan 59 ft
Wing Area 621 sq ft
Sweep 2 degrees

Engines 2
Avia Pegasus
Piston

965 hp
at 13,000 ft


Crew 4


Typical cost $0.044 million in 1934
Total number procured 160


Performance:

Top Speed 237 kts = 273 mph
at 13,000 ft
Mach N/A

Operational Ceiling 31,000 ft

Range 1,350 nm = 1,555 miles
with 75 lbs payload
85 lbs released at halfway point

Climb 1,394 fpm

Cruise 170 kts = 196 mph
at 13,000 ft

Corner Speed 197 KIAS =
240 kts at 13,000 ft
Mach N/A
Turning Rate 25.2 deg/sec
Radius 1,841 ft



Internal Data:

Intake / Fan Diameter 8 ft

Bypass Ratio 82.1

Engine Weight 1180 lbs
Overall Efficiency 23 percent

Structural Factor 1.00

Number of Wings 1
Number of Fuselages 1

Limiting Airspeed 270 kts
Wing Ultimate g Load 9.00 g
Wing Taper 0.3
Wing Thickness at Root 2.3 ft

Tail / Canard Factor 0.4

Number of Nacelles 2
Length 11 ft
Diameter 4.6 ft
Fullness 0.3

Fuselage Diameter 4.3 ft
Fuselage Fullness 0.5

Pressurized Volume 0 percent
Cargo Decks 0

Cleanness 63.2 percent
Unstreamlined section 5.1 sq ft

User equipment 1,790 lbs



F.k. 58

The Dutch goal is to explore the use of the simpler radial engine for an "attack" fighter suited for bomber or ground attack. I used Koolhoven's 1938 F.K.58 as the model, sized the fuselage for a Pegasus and added heavy arms. Compared to the D.XIXb above, it's almost as fast but has far more firepower.



Aircraft Type or Name:

F.K. 58

General Type:
Airplane = 1
Airship = 2
Orbiter = 3
1

Year of First Flight: 1939

Description

Carrier or Rough Field
Monoplane
Conventional Fuselage

Single engine "Heavy fighter" 4x MG, 2x 23mm cannon (double 23mm ammo), 10mm disk behind pilot, radio, 100kg bomb load.



Characteristics:

Weight (maximum) 6,023 lbs
Weight (empty) 5,063 lbs

Length 28.66 ft
Wingspan 36 ft
Wing Area 186 sq ft
Sweep 4 degrees

Engines 1
Avia Pegasus
Piston

965 hp
at 12,000 ft


Crew 1


Typical cost $0.038 million in 1935
Total number procured 32


Performance:

Top Speed 279 kts = 321 mph
at 12,000 ft
Mach N/A

Operational Ceiling 33,500 ft

Range 454 nm = 523 miles
with 260 lbs payload
271 lbs released at halfway point

Climb 1,971 fpm

Cruise 170 kts = 196 mph
at 12,000 ft

Corner Speed 259 KIAS =
310 kts at 12,000 ft
Mach N/A
Turning Rate 26.2 deg/sec
Radius 2,299 ft



Internal Data:

Intake / Fan Diameter 8 ft

Bypass Ratio 82.1

Engine Weight 1036 lbs
Overall Efficiency 23 percent

Structural Factor 1.00

Number of Wings 1
Number of Fuselages 1

Limiting Airspeed 350 kts
Wing Ultimate g Load 12.00 g
Wing Taper 0.3
Wing Thickness at Root 1.1 ft

Tail / Canard Factor 0.4

Number of Nacelles 0
Length 23 ft
Diameter 3.3 ft
Fullness 0.4

Fuselage Diameter 4.8 ft
Fuselage Fullness 0.4

Pressurized Volume 0 percent
Cargo Decks 0

Cleanness 79 percent
Unstreamlined section 2.5 sq ft

User equipment 1,391 lbs




D.XXIII

The D.XXIII is an interceptor prototype. The OTL prototype flew in 1939 and was destroyed in 1940, presumably when the Netherlands was invaded. Rather than use the 500hp engines of the OTL, I went with the Hispano 12Y, but bulked the nacelle diameter slightly to handle a Jumo 211 for future expansion. Given that it's an unusual twin-boom, tractor/pusher design, I am planning a 3 year development with production planes in 1937 or so. Those will likely be somewhat larger, rough field capable, have explosive bolts on the rear propeller hub, have armor, and have Jumo 211Bs with a 16,000-17,000ft. supercharger.






Aircraft Type or Name:

D.23

General Type:
Airplane = 1
Airship = 2
Orbiter = 3
1

Year of First Flight: 1934

Description

Conventional Aircraft
Monoplane
Twin Fuselage

Prototype, 4x 7.92mm MG, 1x 23mm Madsen cannon.



Characteristics:

Weight (maximum) 6,614 lbs
Weight (empty) 5,658 lbs

Length 22.15 ft
Wingspan 38 ft
Wing Area 200 sq ft
Sweep 1 degrees

Engines 2
Hispano-Suiza 12Y
Piston

760 hp
at 12,000 ft


Crew 1


Typical cost $0.035 million in 1936
Total number procured 128


Performance:

Top Speed 318 kts = 366 mph
at 12,000 ft
Mach N/A

Operational Ceiling 40,000 ft

Range 454 nm = 523 miles
with 173 lbs payload
181 lbs released at halfway point

Climb 3,376 fpm

Cruise 160 kts = 184 mph
at 12,000 ft

Corner Speed 262 KIAS =
313 kts at 12,000 ft
Mach N/A
Turning Rate 26.0 deg/sec
Radius 2,334 ft



Internal Data:

Intake / Fan Diameter 7.6 ft

Bypass Ratio 84.6

Engine Weight 1036 lbs
Overall Efficiency 21 percent

Structural Factor 1.00

Number of Wings 1
Number of Fuselages 2

Limiting Airspeed 400 kts
Wing Ultimate g Load 12.00 g
Wing Taper 0.1
Wing Thickness at Root 1 ft

Tail / Canard Factor 0.4

Number of Nacelles 1
Length 23 ft
Diameter 3.4 ft
Fullness 0.4

Fuselage Diameter 1.3 ft
Fuselage Fullness 0.3

Pressurized Volume 0 percent
Cargo Decks 0

Cleanness 79 percent
Unstreamlined section 3 sq ft

User equipment 700 lbs





F.k. 55

This is the Hispano-engined redux of the FK 55, though I may use the Jumo 211 or RA's Fiat engine later. This is mostly a hypothetical aircraft, as I don't have much to go on except the pictures I can find, but they depict two different craft- what was meant to be but had difficulties, and then what flew with the wrong engine. The latter is...pregnant looking. I think there will be a long development cycle to get the sleek designed one.




Aircraft Type or Name:

F.K. 55

General Type:
Airplane = 1
Airship = 2
Orbiter = 3
1

Year of First Flight: 1934

Description

Conventional Aircraft
Monoplane
Conventional Fuselage

Planebuilder SIM of a Koolhovon F.K. 211A. Real plane had center of gravity problems, and underdeveloped engine. Mounts 4x 7.92mm and 1x 23mm and radio.



Characteristics:

Weight (maximum) 4,600 lbs
Weight (empty) 3,989 lbs

Length 26 ft
Wingspan 34 ft
Wing Area 184 sq ft
Sweep 5 degrees

Engines 1
Hispano-Suiza 12brs
Piston

862 hp
at 12,000 ft


Crew 1


Typical cost $0.019 million in 1934
Total number procured 160


Performance:

Top Speed 296 kts = 340 mph
at 12,000 ft
Mach N/A

Operational Ceiling 37,000 ft

Range 405 nm = 466 miles
with 59 lbs payload
61 lbs released at halfway point

Climb 2,508 fpm

Cruise 160 kts = 184 mph
at 12,000 ft

Corner Speed 232 KIAS =
277 kts at 12,000 ft
Mach N/A
Turning Rate 29.3 deg/sec
Radius 1,833 ft



Internal Data:

Intake / Fan Diameter 7.6 ft

Bypass Ratio 82.65

Engine Weight 1036 lbs
Overall Efficiency 23 percent

Structural Factor 1.00

Number of Wings 1
Number of Fuselages 1

Limiting Airspeed 350 kts
Wing Ultimate g Load 12.00 g
Wing Taper 0.4
Wing Thickness at Root 1.1 ft

Tail / Canard Factor 0.4

Number of Nacelles 0
Length 15.5 ft
Diameter 3.75 ft
Fullness 0.4

Fuselage Diameter 3.4 ft
Fuselage Fullness 0.3

Pressurized Volume 0 percent
Cargo Decks 0

Cleanness 79 percent
Unstreamlined section 1.6 sq ft

User equipment 925 lbs

Hi Kirk,

Its probably better to slim down the stats posted a minimum and keep the extra data for later if needed.

Example

Type: Fiat CR.35
Year: 1934 Crew: 1 Engine: 1 * 760hp Isotta-Fraschini L1406 A1
Wing Span: 8.51m Length: 6.99m Height: 2.40m Wing Area: 13.86m2
Empty Weight: 1026kg Max.Weight: 1250kg
Speed: 612km/h@4000m Ceiling:13400m Range: 560km
Climb Rate: 1300m/min (4300fpm) Wing Loading: 90kg/m2(18lb/sqft) Power/Weight: 0.61hp/kg (0.28hp/lb)
Armament: 4*7.7mm mg in wings

Its good to work out wing loading and Power/Weight as well.

Explosive bolts on the rear propellor of the D.23 will fire the propellor into the tailplane. That isn't a good idea.

Boiling it down is what I used to do, because the full planebuilder is messy, but SA said to start posting planebuilders. I'd be just fine going back to boiled down approach I use in the Netherlands Airforce space, which includes wingloading as well.

On the pusher prop- does it matter if it's going into the tailplane if you're bailing out? Perhaps an gear to arrest the rear prop in a position that would allow a pilot to egress? Historically Fokker was looking into ejection seats, but it seems early for that.

Quoted

On the pusher prop- does it matter if it's going into the tailplane if you're bailing out?

The impact would give the pilot quite a shock. Theres alos the possibily of the still spinning prop biting through either tail boom. Just makes it harder to actually get out. Best thing before ejector seat is to roll over and fall out of the cockpit.

Quoted

Originally posted by Red Admiral
Type: Fiat CR.35
Year: 1934 Crew: 1 Engine: 1 * 760hp Isotta-Fraschini L1406 A1
Wing Span: 8.51m Length: 6.99m Height: 2.40m Wing Area: 13.86m2
Empty Weight: 1026kg Max.Weight: 1250kg
Speed: 612km/h@4000m Ceiling:13400m Range: 560km
Climb Rate: 1300m/min (4300fpm) Wing Loading: 90kg/m2(18lb/sqft) Power/Weight: 0.61hp/kg (0.28hp/lb)
Armament: 4*7.7mm mg in wings

Its good to work out wing loading and Power/Weight as well.

The problem here, and with my standard synopsis under the Netherlands Air Force is that it's hard to see what was done to make that work.

For example, that Fiat has really good performance and a very low weight. I could get the speed up to 612km / 330kts at the light 2262lbs&but could only reach that 2262 with a 170lb engine.

Eventually I ramped the cleanness up to 100%, and then I could manage 330kts at light, but to hit that light 2262lbs the 760hp engine could only be 266lbs on a 0.9' thick wing. Obviously, I'm missing something-but the info isn't there to decide what.

Quoted

The problem here, and with my standard synopsis under the Netherlands Air Force is that it's hard to see what was done to make that work.

Well yes. For the people who are bothered by that just ask me for the spreadsheet of the design. Otherwise its easier to just post reduced specs.