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1

Sunday, January 21st 2018, 11:10am

Helicopter Trials

The Dutch Luchtmacht is seeking entrants for a competitive fly-off evaluation for two types of rotary-wing helicopters.

The first is a small helicopter suitable for observation duties carrying a crew of at least two and possibly, but not necessarily, also having room for up to two passengers.
The second type is a larger helicopter capable of carrying troops or cargo, at least six soldiers must be carried along with their equipment and personal weapons.
Both types must be suitable for field operations and be of rugged and reliable construction and be capable of operations in tropical and high-altitude environments.

The Luchtmacht will be holding a four-week evaluation at Tikapoo Valley Air Base in Ubangi Shari starting on 1 September 1948. All companies wishing to tender should enter at least two and no more than three airframes of each model offered and should send company test pilots and ground support crews.
At the end of the evaluation the Luchtmacht hopes to place orders for quantities of both types and only the best performing helicopters will be selected.

2

Monday, January 22nd 2018, 4:26pm

RE: Helicopter Trials

The Dutch Luchtmacht is seeking entrants for a competitive fly-off evaluation for two types of rotary-wing helicopters.

The first is a small helicopter suitable for observation duties carrying a crew of at least two and possibly, but not necessarily, also having room for up to two passengers.
The second type is a larger helicopter capable of carrying troops or cargo, at least six soldiers must be carried along with their equipment and personal weapons.
Both types must be suitable for field operations and be of rugged and reliable construction and be capable of operations in tropical and high-altitude environments.

The Luchtmacht will be holding a four-week evaluation at Tikapoo Valley Air Base in Ubangi Shari starting on 1 September 1948. All companies wishing to tender should enter at least two and no more than three airframes of each model offered and should send company test pilots and ground support crews.
At the end of the evaluation the Luchtmacht hopes to place orders for quantities of both types and only the best performing helicopters will be selected.


The SFG firm of France will send three different types of helicopters to address the two different requirements.
-- Three examples of the SH.20 Cigale in order to meet the observation requirement.
-- Two examples of the new SH.40 Tourbillon (also known in Russia as the Sikorsky S-19) to meet the transport requirement
-- Two examples of the twin-rotor SH.30 Perdrix, also to meet the transport requirement.

The SH.30 is a twin-rotor helicopter that has fourteen passengers, whereas the SH.40 has only a maximum of ten passengers.

3

Saturday, January 27th 2018, 11:06pm

Atlantis can offer two examples of the following designs for Observation role...

Quoted

Roth R-3 helicopter

Crew: 1
Capacity: 2 passengers or 460 lb's of cargo
Length: 40 ft.
Height: 10 ft. 10 in.
Empty weight: 3,740 lb.
Gross weight: 4,710 lb.
Powerplant: 1x Roth RV-8 piston 585 hp.
Max speed 110 mph
Rotor diameter: 47 ft.
First flight:1947
Design features: three rotor blades, tricycle landing gear, fully enclosed cockpit/fuselage
(OOC: resembles a Mil MI-1 or PZL SM-2)


Quoted

Ripon/Bloch RB.H100
Crew: 2
Length: 29 ft
Height: 8.65 ft
Empty weight: 1,951 lb. (885 kg)
Gross weight: 2,546 lb. (1,155 kg)
Powerplant: 1x Ripon/Bloch RB-601 piston 180 hp.
Cruise speed 124 mph; 108 kn. (200 km/h)
Rotor diameter: 32 ft.
First flight:1945
Design features: single four-bladed main rotor two-bladed anti-torque tail rotor, fixed tricycle landing gear, fully enclosed cockpit, fully skinned fuselage
(OOC: resembles a Higgins EB-1)


A third design built in Atlantis, the Roth R2 is an Atlantean licence built version of the French Cigale. The design in theory could be offered, however the design has not been entered as France being the initial designer has already submitted the design in these trials.

Quoted

Roth R-2 (Licence built Societe Francaise Du Gyroplane SH.20 Cigale)


Image by Bruce, design by Brock.

Although the Roth-Dorand GII.A had decent performance for a helicopter of its generation, and delivered acceptable service, the type was never fully satisfactory, particularly in its maintenance and accident history. SFG, in collaboration with their Atlantean and Russian counterparts, worked to develop a new type with more utility and safety.

General characteristics:
Crew: 1 (pilot)
Passengers: 1-3 passengers (version dependent)
Length: 13.1 m (43 ft)
Rotor Diameter: 15 m (49 ft 2.5 in)
Height: 3.9 m (12 ft 11 in)
Loaded weight: 2,270 kg (5,004 lb)
Powerplant: Gnome-Rhône 9M (600 hp / 447 kW) radial engine

Performance:
Maximum speed: 94.5 knots (108 mph, 175 km/h)
Max Range: 475 km (295 miles)
Rate of climb: 5.3 m/s (1,043 ft/min)
Service ceiling: 3,500m (SH.20); 3,900 (SH.22)

Armament / Capacity:
- 2 × depth charges or 4 × 25kg bombs
or
- 2 panniers for mail, cargo, or casualty evacuation (1 person / 125kg each)

Variants:
- SH.20: Initial 2-seat prototype, unarmed (1941)
- SH.20M: 2-seat armed variant for Marine Nationale (1942)
- SH.21: 3-seat variant for Army utility and light reconnaissance (1942)
- SH.22: 4-seat variant for Army utility (1943)
- SH.22M: 4-seat variant for Navy utility (1943)
- SH.23-25: Reserved for possible export variants
- SH.26: 3-seat civilian helicopter (1944) based on SH.21
- SH.29: Turboshaft engine testbed (1946)

4

Sunday, January 28th 2018, 10:57am

Britain will send two Fairey Widgeon helicopters.

Length: 41 ft 10 in (12.75 m)
Rotor diameter: 49 ft 2 in (14.99 m)
Height: 13 ft 4 in (4.07 m)
Disc area: 1,898 ft² (176.4 m²)
Empty weight: 4,322 lb (1,969 kg)
Loaded weight: 5,900 lb (2,682 kg)
Powerplant: 1x 520hp Alvis Leonides VII/2 nine-cylinder air-cooled radial engine
Maximum speed: 109 mph (175 km/h) at sea level
Range: 310 miles (500 km)
Service ceiling: 11,800 ft (3,600 m)
Rate of climb: 700 ft/min (3.6 m/s) at sea level
Capacity: pilot and and four passengers, or two litters or light cargo

Also attending will be two Weir W.11 Air Horse heavy-lift transport helicopters.
[Specs as OTL]

***

[cocked up my dates, the Avions-Fairey Gyrodyne won't be ready in time so Belgium won't be sending anything after all]

5

Thursday, February 1st 2018, 1:31pm

China offers:

Quoted


Observation role:
HUC-1
General characteristics:
Crew: 1 pilot
Length: 6.30 m
Rotordiameter: 10.1 m
Height: 3.40 m
Disc area: 156.0 m²
Empty weight: 990 kg
max. take off: 1410 kg
Powerplant: 1x Dong Ming with 260 hp

Performance:
max. speed: 150 km/h
cruise speed: 125 km/h
max Range: 350 km
ceiling: 3000 m

Variants:
HUC-1C: Cargo version (250 kg payload)
HUC-1O: Observer version; 1 passenger




Transporter role:

Quoted


HUC - 2:
General characteristics:
Crew: 2 pilots
Length: 9.76 m
Rotor diameter: 10.00 m
Disc area: 74.71 square m
empty weight: 2.932 kg
Max takeoff weight: 4.510 kg
Powerplant: 2x Dong Ming with 575hp

Performance
max. speed: 236 km/h
cruise speed: 182 km/h
max. range: 595 km
ceiling: 6.400 m

Variants:
HUC-2C: Cargo version (up to 700kg or 6 passengers)
HUC-2H: Ambulance version (four stretchers + medical assistance)

6

Saturday, February 3rd 2018, 12:37pm

The USA will send two designs for the observation role:

Two Bell Model 47A to YR-13/HTL-1 standard.
[Specs as OTL]

Two Bell Model 54 to XR-15 standard.
[Specs as OTL]

7

Saturday, February 3rd 2018, 8:31pm

Due to the questionable choice of location for the evaluations, Japan will not send anything.