WesWorld

Another Argentine requirement.

12-15 flying boats to replace the Fokker T.IVa

Must be multi-engined, long range (no set limit but obviously longer-ranged than the Fokker), good self-defence capabilites, to carry sizable A/S warloads (bombs, DC and mines).


Shorts offer the Short S.25 Sunderland Mk II; developed to R.22/33 as an official private venture based on the C Class flying boats operated by Imperial Airways. Is identical to the Mk I except for a dorsal powered-turret replacing the beam manual-aimed MGs as the Sunderland Mk II. Defence was by powered turrets, two 7.7mm in the nose turret, four in the rear turret and two in dorsal turret. Bombs racks extend along the inner wing from the fuselage can carry up to 4,000lbs of bombs or depth-charges. Ten crewmen carried.
Dimensions; 112.9/ 85.3/ 34.6/ 1,687 sq ft; 4x 1,010hp Bristol Pegasus XXII; max speed 195mph; range 2,500 miles and service ceiling 17,400ft.


Supermarine offers a variant of its 328 Southport; developed to R.5/35 as a new flying boat smaller and faster than the Sunderland. This twin-tailed monoplane flying boat is conventional in construction and has a crew of seven. The armament is modified to one Boulton-Paul four 0.303in Browning MG turret and one twin MG rear turret. The bombs are carried in eight wing bomb cells which can take a 250lb bomb each and the four inner ones can also carry a 500lb bomb. The first flight could be in late 1938.
Dimensions; 97/ 82.9/ 30.2/ 1,360 sq ft; 2x 1,400hp Bristol Hercules IV; max speed 323mph; range 1,500 miles and service ceiling 25,000ft.

Atlantis offers the following design.

Accrisius R-9 Shearwater

Type: Flying boat
Crew: 10
Demensions: span 133 ft, length 88 ft 9 in, height 24 ft 1 in
Powerplant/performance: Four Spartan 1000 HP engines, speed 217 mph, climb rate N/A, ceiling 21,350 feet, range 2700 miles/4,350 km
Armament: 5x7.7mg (two in nose section, one in ventral tunnel possition two in tail section), 2x12.7 mm MG (one in nose, one in dorsal turret), 1,000 lb bombload

Dornier offers a version of the Do-24Ks currently in service with the Netherlands, trading a reduction in overall range for the capability to carry 4,000 pounds of stores (torpedoes, mines, or bombs) under the wings and self-sealing fuel tanks.

Aircraft Type or Name:

Dornier Do-24 Arg

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

Year of First Flight: 1938

Description

Flying Boat / Seaplane
Monoplane with Struts
Conventional Fuselage

A Jumo-208 powered version of the historical Do-24K. Armed with 6 7.92mm MGs, in nose, dorsal, and tail turrets and fitted to carry upt to 4000 pounds of torpedoes, bombs, or mines under the wings. Self-sealing fuel tanks add 1700 pounds to the airframe.




Characteristics:

Weight (maximum) 39,600 lbs
Weight (empty) 19,416 lbs

Length 71.5 ft
Wingspan 89 ft
Wing Area 1,148 sq ft
Sweep 5 degrees

Engines 3
Jumo 208A
Piston

1,206 hp
at 8,000 ft


Crew 5


Typical cost $0.087 million in 1939
Total number procured 120


Performance:

Top Speed 232 kts = 267 mph
at 8,000 ft
Mach N/A

Operational Ceiling 20,000 ft

Range 3,600 nm = 4,145 miles
with 3,767 lbs payload
4,796 lbs released at halfway point

Climb 1,252 fpm

Cruise 170 kts = 196 mph
at 12,000 ft

Corner Speed 122 KIAS =
137 kts at 8,000 ft
Mach N/A
Turning Rate 14.0 deg/sec
Radius 1,901 ft



Internal Data:

Intake / Fan Diameter 10 ft

Bypass Ratio 106

Engine Weight 1750 lbs
Overall Efficiency 27 percent

Structural Factor 0.95

Number of Wings 1.01
Number of Fuselages 1

Limiting Airspeed 250 kts
Wing Ultimate g Load 2.50 g
Wing Taper 0.1
Wing Thickness at Root 2.4 ft

Tail / Canard Factor 0.2

Number of Nacelles 3
Length 6 ft
Diameter 4.5 ft
Fullness 0.5

Fuselage Diameter 9 ft
Fuselage Fullness 0

Pressurized Volume 0 percent
Cargo Decks 0.5

Cleanness 65 percent
Unstreamlined section 8.5 sq ft

User equipment 3,000 lbs

CRDA offers a modified version of their Z.506 Airone. Designed as a bomber and naval reconnaissance plane to supplement the Z.501, the Z.506 has a much larger range. Wood and fabric construction with metal floats. A deep fuselage houses an internal bay for a single 450mm torpedo or depth bombs. Armament comprises of two 13.2mm Scotti in a Breda electrically powered turret and a single 13.2mm Scotti in the ventral position.

Year: 1936 Crew: 5 Engine: 3 * 1800hp Alfa-Romeo 137 RC.18
Wing Span: 100ft Length: 65ft Wing Area: 1397sq ft
Empty Weight: 24138lb Max Weight: 50600lb
Max Speed: 259mph@sl Ceiling: 22,000ft
Climb Rate: 1037fpm Wing Loading: 40lb/sq ft
Range: 6000km with 2000kg
Armament: 2 x 13.2mm Scotti in dorsal turret, 1 x 13.2mm Scotti in ventral turret
Internal ventral bomb bay
8 x 100kg wing hardpoints

Australia can offer:



CAC/BAM Pelican (based a bit on OTL Saro Lerwick)

General characteristics RTL.

* Crew: 7
* Length: 62 ft
* Wingspan: 79 ft
* Height: 20 ft
* Wing area: 820 ft²
* Loaded weight: 27,000 lb
* Max takeoff weight: 32,000 lb
* Powerplant: Pratt & Witney 1,200 hp R-1830 Twin Wasp

Performance

* Maximum speed: 210 mph @ 5,700 ft
* Range: miles 1500 miles
* Service ceiling 14,000 ft
* Rate of climb: 880 ft/min

Armament

* 6 × 0.303 in (7.7 mm) Browning guns (nose [2], dorsal [2] & tail [4])
* 2,000 lb (900 kg) of bombs or depth charges or torpedoes.

CC&F PB-7 "Cearadactyl" Patrol Bomber

four 7.62mm MGs in nose, dorsal and beam, 2000lbs ordanance
229 knots
1800nm @ 155 knots

(You should still have the full stats somewhere, Hood)

Japan has a few flying boat types. The H5Y and H6K are already in production. The production of the H7Y starts/started this year (depends on when the Argentines are looking for the replacement). The production of the H8K is projected to commence in the second half of 1938.


Yokosuka H5Y

Version H5Y2
Crew: 7
Length: 20.45 m
Wingspan: 31.57 m
Height: 5.93 m
Empty weight: 7522 kg
Loaded weight: 12500 kg
Powerplant: two Mitsubishi MK1B Shinten 21, 1400 hp
Maximum speed: 245 km/h
Service ceiling: 6000 m
Range: 3500 km
Armament: Five 7.7mm machine guns, two 250 kg bombs




Kawanishi H6K

Version H6K2
Crew: 9
Length: 25.63 m
Wingspan: 40.00 m
Height: 6.27 m
Empty weight: 10340 kg
Loaded weight: 16000 kg
Powerplant: Four Mitsubishi Kinsei 43, 1000 hp each
Maximum speed: 331 km/h
Service ceiling: 7600 m
Range: 6080 km
Armament: Three 7.7mm machine guns, four 250 kg bombs or two 18" torpedoes

Note: When interested, transport versions of the H6K are available (H6K2-L and H6K3)




Kawanishi H7Y

Version H7Y1
Crew: 4
Length: 26.23 m
Wingspan: 40.00 m
Height: 6.27 m
Empty weight: 13500 kg
Loaded weight: 18000 kg
Powerplant: Four Kanzaki I-12B diesel engines, 600 hp each
Maximum speed: 319 km/h
Service ceiling: 6000 m
Range: 9250 km
Armament: One 20mm canon, three 7.7mm machine guns, 1600 kg bombs or two 18" torpedoes

Note: only stats I could find on this plane were crew, range, engines and loaded weight (which I got from forum.valka.cz ) and I used the data of another plane of about the same weight to get the other stats. If anyone has more stats on this plane, it would be greatly appreciated.




Kawanishi H8K

Version: H8K1
Crew: 10
Length: 28.12 m
Wingspan: 38.00 m
Height: 9.15 m
Empty weight: 15500 kg
Loaded weight: 24500 kg
Powerplant: Four Mitsubishi MK4B Kasei 12, 1530 hp each
Maximum speed: 433 km/h
Service ceiling: 7630 m
Range: 7200 km
Armament: Two 20mm canons, five 7.7mm machine guns. 2000 kg bombs or two torpedoes.

Quoted

Originally posted by Rooijen10
Kawanishi H7Y

Version H7Y1
Crew: 4
Length: 26.23 m
Wingspan: 40.00 m
Height: 6.27 m
Empty weight: 13500 kg
Loaded weight: 18000 kg
Powerplant: Four Kanzaki I-12B diesel engines, 600 hp each
Maximum speed: 319 km/h
Service ceiling: 6000 m
Range: 9250 km
Armament: One 20mm canon, three 7.7mm machine guns, 1600 kg bombs or two 18" torpedoes

Note: only stats I could find on this plane were crew, range, engines and loaded weight (which I got from forum.valka.cz ) and I used the data of another plane of about the same weight to get the other stats. If anyone has more stats on this plane, it would be greatly appreciated.

The appearance and so on are VERY, VERY close to the Do-26, though the Do-26 is a little heavier at maximum load. Given the increase in range and the decrease in overall weight, while using the same engines, I'd have to suspect it would have had less load capacity than the Do-26, which with a similar armament was only 12 troops.

It has been a while, but when I ran across the picture I thought it was mentioned H7Y, but it is quite possible that I am wrong about that (and looking at the Do-26, it does appear to be the same plane).

It should be something like the one here:

http://forum.valka.cz/viewtopic.php/titl…ka-H7Y1/t/31668

Not sure about the data. I used the Do-24 data as base for the info I did not have and made a few changes here and there (and maybe changed it a bit too much).

I found some data about a Yokosuka H7Y, it was (apparently) a one-off, that according to the site, had engines mounted just like the Do-26. I almost wonder if it wasn't a Do-26 built under license, but I can't find any reference to such a license.

Looking at forum.valka.cz, the Do-26 is actually lighter than the H7Y1.

Quoted

Dornier Do 26V-6 (D-0)

Vzletová hmotnost: 11 400 kg
Max. vzletová hmotnost: 20 000 kg

Quoted

Yokosuka H7Y1
Hmotnost vzletová / Take-off weight (kg): 18 000

... so the normal take-off weight of the Do 26 is 11,400 kg and that of the H7Y1 is 18,000 kg, a 6,600 kg difference. So in that case it would not be a licence built Do-26, but maybe an enlarged version of the Do-26 (since the Do-26 is mentioned in the H7Y text).

Considering that the Do-26 uses a more powerful version of the Jumo 205, that would mean that the H7Y1 would probably be a bit slower than the speed I used.

Quoted

Originally posted by Rooijen10
Looking at forum.valka.cz, the Do-26 is actually lighter than the H7Y1.

Quoted

Dornier Do 26V-6 (D-0)

Vzletová hmotnost: 11 400 kg
Max. vzletová hmotnost: 20 000 kg

Quoted

Yokosuka H7Y1
Hmotnost vzletová / Take-off weight (kg): 18 000

... so the normal take-off weight of the Do 26 is 11,400 kg and that of the H7Y1 is 18,000 kg, a 6,600 kg difference. So in that case it would not be a licence built Do-26, but maybe an enlarged version of the Do-26 (since the Do-26 is mentioned in the H7Y text).

Considering that the Do-26 uses a more powerful version of the Jumo 205, that would mean that the H7Y1 would probably be a bit slower than the speed I used.

Other sources give the Do-26 an EMPTY weight of 11,300 (prototypes) or 10,700 (production model) kg. Some of the Do-26s used the same engines as the Yokosuka plane, others used the more powerful Jumo-205D.

The choice comes down to two designs.

The Do-24 Arg and the H8K. Both are the longest ranged and the biggest load carriers. Many others are suitable for replacing the small seaplanes I have but that would be decided seperately and the Navy can't afford to buy many aircraft (given other large purchases of torpedo bombers). I think since the total order will be 12 aircraft there is no point in buying an experimental type or a brand-new type given likely teething troubles I have decided to go for the Do-24.


For a smaller 1,500 mile ranged flyingboat/ seplane to replace the Vanquish-based type currently in use I think the CAC Pelican would fit the bill perfectly but I am not ordering any just yet. Maybe later in 1938. An order would be around 36-48.

Since this aircraft is, in essence, the Do-24K with the wing hardpoints of the Do-24M and self-sealing tanks, Dornier expects to deliver the first aircraft of this order by the end of the year.

[Got to love that H8K, though, great plane, that one.]