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2018-02-21

BACKGROUND NOTES

 
 

VTOL  TRANSPORT  AIRCRAFT

 
The story which did happen ... outside Atlantic Air Combat
 
  See also :  
 

INTRODUCTION

VTOL transport aircraft aren't scheduled in Atlantic Air Combat™ as, beyond their historical inexistence, such a type of transport would not add much to the game, with tactical landing by conventional STOL aircraft being enough of a challenge. Then, as VTOL fighters (re: Harrier, VAK-191B and VJ-101) have been added to the game following a special request, VTOL aircraft operation is thus already there and transport could be easily added. The below data has been assembled should this choice be reversed. Should it happen, the following designs are suggested :

  XC-142A – basic design
troop transporting capacity (32)
rear ramp (cargo in-flight dropping
  X-22 – an enlarged version thereof
a weird looking alternative to the XC-142A
–
  Do.31 – basic design
troop transporting capacity (32)
design ot be "sold" to Switzerland and Brazil

In the absence of equivalent design on the Soviet side, it is suggested to squeeze a "capture" mission to allow one or several of the chosen types to be captured rather than shot down, and thus incorporated in the chosen WAPA/Allied air force.

C-142A

Five Vought (actually: LTV-Hiller-Ryan) XC-142As were built.  Powered by four 3,080 eshp GE T64-GE-I turboprops. A differential tail thrust propeller maintained pitch axis control. Accommodating 2 pilots and 32 fully equipped troops, it's top speed was 431 mph at 20,000 feet, at which height it cruised at 253mph. The machine's tactical radius of action with full load ranged from 230 to 470 miles, depending on whether the departure and arrival were vertical or conventional.

The five XC-l42As amassed 420 flying hours in 488 flights, the aircraft being handled by no less than 39 military and civilian pilots between 1964 and 1967. The XC-142A came close to providing the world with its first effective VTOL transport.

X-22

The Bell X-22 was an American V/STOL X-plane with four wing mounted interconnected tilting ducted fans containing three bladed propellers, each powered by a gas turbine. The X-22 was to further explore the tactical application of VTOL troop transporters after the preceding Hiller X-18.  It was followed by the Bell XV-15 which itself lead to the contemporay V-22 Osprey. More specifically, the X-22 was Bell's answer to a tri-service requirement for a V/STOL experimental aircraft.  While the Air Foce preferred the tilt-wing concept, as found on the XC-142, the Navy preferred a ducted fan configuration allowing a subbier design with shorter wing span doing away with complex wing folding system as it would be easier to fit on existing carrier elevators.  Ducted fan was also considered safer in the context of a cramped flight deck.

Vertical takeoff was with the propellers tilted vertically, and STOL operation with the nacelles tilted forward at ±45°. Maneuvering was achieved by tilting the propeller blades in combination with control surfaces located in the propellers airstream. Such was the efficiency of the layout that it could still take off on three engines, fly on two, and make a conventional landing with one.

The first prototype maiden flight occurred on 17 March 1966 but crashed later in August. The second X-22 first flew on 26 August 1967 with a last flight occuring as late as 1988.  The X-22 failed to reach the targeted maximum speed of 525 km/h (326 mph; 283 knots).  Some derivatives were studied such as an armed variant known as the X-22A-1 with redesigned forward fuselage; a 1400shp T58-GE-5 powered general purpose X-22B and the X-22C, an enlarged cargo variant with rear ramp and 2650shp T55-L-7 turboshaft engines.

Do 31

The Dornier Do 31 was a West German experimental VTOL jet transport that first flew in 1967. Designed to meet a NATO specification for a tactical support aircraft for the EWR VJ 101 VTOL strike fighter, it was cancelled in 1970.

Initial designs incorporated a Bristol Pegasus vectored-thrust turbofan in each of the two inboard nacelles and four Rolls-Royce RB162 lift engines in each of the outer nacelles. It was planned to dispense with the outer nacelles and their engines when larger 5000 lbf RB153 turbofans became available. By mounting the engines in pods, the fuselage could provide a capacious hold with a rear loading ramp.

SPECIFICATIONS

The below data is a quick assembly only.   When missing, some capacity details have been estimated.  Data for the contempoary Bell V-22 Osprey is only shown for information and comparison purposes.

      HILLER CURTISS VOUGHT BELL DORNIER CANADAIR BELL
Aircraft.ID     X-18 X-19 XC-142A X-22 Do.31 CL-84 V-22
      (1959) (1963) (1964) (1966) (1967) (1972) (1989)
      Tilt-wing Tilt-rotors Trilt-wing Tilt-rotors VTOL Tilt-wing Tilt-rotors
     
     
DETAILS 2 2 2 2 4 4 7 4 7 4 7 4 7 4 7 4 7 4 7
Category Fighter – Transport Transport Transport Transport Transport Transport Transport
Genre Seaplane – - - - - - - -
Sub-Genre Vintage – VTOL VTOL VTOL VTOL VTOL VTOL VTOL
Carrier.Capable YES/NO – YES YES YES YES YES YES YES
Launch=No.catap YES/NO – no no no no no no no
Pressurized YES/NO – YES YES YES YES YES YES YES
DIMENSIONS     X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Length – – 19.20 m 12.83 m 17.71 m 12.07 m 20.53 m 14.415 m 17.50 m
Span – – 14.60 m 6.55 m 20.60 m 11.96 m 18.00 m 10.460 m 14.00 m
Height – – 7.50 m 5.20 m 7.95 m 6.31 m 8.53 m 4.340 m 5.50 m
Body Ψ WΧ H – – – – – – – –
Wing surface – – – – 50 m² – 57 m² 22 m² 28.00 m²
ENGINES     X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Engine-1:ID Turbine/Jet – 2 T.40 2 T.55 4 T.64 4 T.58 2 BE.53 2 T.53 2 T.406
Engine-1:Prop Diam – 14'00" ?... ?... 7'00" ?... 14'00" 38'00"
Engine-1:Pwr1 Military hp 2 5500.hp 2 2200.hp 4 2850.hp 4 1267.hp 2 15500.lbf 2 1500.hp 2 6150.hp
Engine-1:Pwr2 extra hp – – – – – – – – – – – – – –
Engine-2:ID Jet – 1 J-34 – – – – – – 8 RB162 – – – –
Engine-1:Pwr1 Military lbf 1 3400.lbf – – – – – – 8 4400.lbf – – – –
Engine-1:Pwr2 extra lbf – – – – – – – – – – – – – –
Engine-1:SFC1 lbs/hr*hp Mass – – – – – – –
Engine-1:SFC1 gal/hr*lbf Vol – – – – – – –
Engine-1:SFC2 lbs/hr*hp Mass – – – – – – –
Engine-1:SFC2 gal/hr*lbf Vol – – – – – – –
AVIONICS     X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Radar: – ID APS-23 APS-23 APS-23 APS-23 APS-23 APS-23 APS-23
IRST: – ID – – – – – – –
Tail warn: – ID APG-03 APG-03 APG-03 APG-03 APG-03 APG-03 APG-03
Sonobuoys: – ID – – – – – – –
FEATURES     X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Engine-1:Reverse – – no no no no no no no
IFR:boom Fixed – no no no no no no no
IFR:boom Retract – no no no no no no no
IFR:receptacle – – no no no no no no no
IFR:receptacle Doors – no no no no no no no
Air.Brakes – – no no no no no no no
Flaps – – no no no no no no no
Landing.Gear – – no no no no no no no
Landing.Gear Retract – no no no no no no no
Arresting.Hook – – no no no no no no no
Brake.Chute – – no no no no no no no
Wingfold Powered – no no no no no no no
Canopy.Opening InFlight – no no no no no no no
Navigation.Lights – – no no no no no no no
Fire.Extinguisers Engines – no no no no no no no
Bomb/Cargo.Doors – – no no no no no no no
Search.Light – – no no no no no no no
Crew – Q 3 2 3 2 2 2 4
Egress.Procedure Pilot Q 1 Eject 1 Eject 1 Eject 1 Eject 1 Eject 1 Eject 1 Eject
Egress.Procedure Co-Pilot Q 1 Eject 1 Eject 1 Eject 1 Eject 1 Eject 1 Eject 1 Eject
Egress.Procedure Loader Q 1 Bail Out – – 1 Bail Out – – – – – – 2 Bail Out
Egress.Procedure Passenger Q ?... – ?... – 32 – 6 – 36 – 12 – 32 –
Egress.Procedure Troops Q ?... – ?... – 32 – ?... – 36 – ?... – 32 –
Egress.Procedure Commando Q ?... – ?... – 32 – ?... – 36 – ?... – 32 –
Egress.Procedure Paratroop Q ?... Bail Out ?... Bail Out ?... Bail Out ?... Bail Out ?... Bail Out ?... Bail Out ?... Bail Out
Egress.Procedure Stretchers Q ?... – ?... – ?... – ?... – ?... – ?... – ?... –
WEAPONS INTERNAL   X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
– – – // // // // // // //
FUEL INTERNAL   X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Fuel:Internal Std – ?... ?... ?... 465.US ?... ?... ?...
Fuel:Internal Std – .gal .gal .gal .gal .gal .gal .gal
WEIGHTS  & LOADS   X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Weight: Empty - 26786.lb 8775.lb 22600.lb 9484.lb 0.lb 8417.lb 33140.lb
Crew: 200 lb/@ Q 2 400.lb 2 400.lb 3 600.lb 2 400.lb 2 400.lb 2 400.lb 4 800.lb
Fuel:Int.AvGas galΧ7.20 Q - .lb - .lb - .lb - .lb - .lb - .lb - .lb
Fuel:Int.JP4 galΧ7.60 Q - .lb - .lb - .lb - .lb - .lb - .lb - .lb
Sub-Total-1 Basic – .lb .lb .lb .lb .lb .lb .lb
PAYLOADS INTERNAL   X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Cargo Bulk Q – .lb – 1200.lb = 8000.lb – 1190.lb – .lb – .lb – .lb
Cargo - Pellets 500 lb/@ Q - .lb - .lb - .lb - .lb - .lb - .lb - .lb
Passengers 225 lb/@ Q – .lb – .lb – .lb 6 1350.lb – .lb 12 2700.lb – .lb
Stretchers 225 lb/@ Q - .lb - .lb - .lb - .lb - .lb - .lb - .lb
Attendants 225 lb/@ Q - .lb - .lb - .lb - .lb - .lb - .lb - .lb
Troop 300 lb/@ Q – .lb – .lb 32 9600.lb – .lb 36 10800.lb – .lb 32 9600.lb
Commandos 300 lb/@ Q – .lb – .lb 32 9600.lb – .lb 36 10800.lb – .lb 32 9600.lb
Paratroopers 360 lb/@ Q - .lb - .lb - .lb - .lb - .lb - .lb - .lb
Sub-Total-2 Internal - .lb .lb .lb .lb .lb .lb .lb
PAYLOADS EXTERNAL   X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Sub-Total-3 External – // // // // // // //
WEIGHT SUMS   X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Sub-Total-1 Basic – .lb .lb .lb .lb .lb .lb .lb
Sub-Total-2 Internal – .lb .lb .lb .lb .lb .lb .lb
Sub-Total-2 Allowance – 000.lb 000.lb 000.lb 000.lb 000.lb 000.lb 000.lb
Sub-Total-3 External – // // // // // // //
Weight:Total External – .lb .lb .lb .lb .lb .lb .lb
MTOW STOL – ?... ?... 44500 lb ?... ?... 14500.lb 57000 lb
MTOW ~ – 33000 lb 13660 lb - 18000 lb 60500 lb - -
MTOW VTOL – ?... ?... ?... ?... ?... 12600.lb 52600 lb
PEFORMANCE     X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
Speed:Rotation F35Χ1.1 knot – – – – – – –
Speed:Takeoff F35Χ1.2 knot – – – – – – –
Speed:Max – knot 200.kn 395.kn 375.kn 275.kn 395.kn 280.kn 305.kn
Speed:Cruise – knot ?... ?... 250.kn 185.kn 350.kn 260.kn 240.kn
Speed:Approach F35Χ1.4 knot – – – – – – –
Speed:Stall F00 knot – – – – – – –
Speed:Stall F15 knot – – – – – – –
Speed:Land F35 knot – – – – – – –
Speed:Stall F35 knot – – – – – – –
Climb.rate – ?... ?... 6800 ft/min ?... 3780 ft/min 4200 ft/min ?...
Ceiling – ft 35300 ft ?... 25000 ft 27000 ft 35100 ft ?... 25000 ft
TakeOff.Run – ft – – – – – – –
Landing.Run Brakes ft – – – – – – –
Landing.Run Reverse ft – – – – – – –
Landing.Run Chute ft – – – – – – –
Range:Internal Standard nmi .nmi .nmi .nmi .nmi .nmi .nmi .nmi
Range:Extra External nmi .nmi .nmi .nmi .nmi .nmi .nmi .nmi
Range: Ferry – nmi .nmi .nmi .nmi .nmi .nmi .nmi .nmi
Range: Warload 10000.lb nmi .nmi 282 nmi 800 nmi 385 nmi 971 nmi 366 nmi 879 nmi
Range: Warload 72000.lb nmi .nmi .nmi .nmi .nmi .nmi .nmi .nmi
ID     X-18 X-19 XC-142 X-22 Do31 CL-84 V-22
NAME     – – – – – Dynavert –
 
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