V-22 brews up

Discussion in 'Current Affairs, News and Analysis' started by codbutt, Nov 9, 2007.

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  1. I thought the other thread entitled "Grim Reaper" would be about this - but it wasn't. So here you are - the $100 million lemon does it again!
    Incidentally - have a look at the figures at the bottom here, comparing Britain's 1950s vintage Fairey Rotodyne versus the great Amarillo Lemon.


    V-22 Osprey severely damaged after engine fire
    By Stephen Trimble

    The US Marine Corps is investigating the cause of an engine fire that forced a Bell Boeing MV-22 to make an emergency landing in North Carolina on November 6.

    The Block A aircraft is understood to have suffered severe damage, although no one was injured. The incident occurred around 9 pm near the MV-22 training squadron’s home base at Marine Corps Air Station New River.

    The USMC has deployed 10 MV-22s to Al Asad Air Base, Iraq, and the US Air Force is keen to quickly deploy its handful of CV-22s as well.

    The circumstances of the incident raise three possibilities for the cause: human or maintenance error, a recurring problem with the engine air particle separator (EAPS), or yet a new mechanical or design flaw that had gone undetected through development and operational testing.

    The original EAPS unit has been linked to two engine fires since December. In the first incident, a hydraulic line ruptured due to a faulty bearing inside the EAPS housing within the nacelle. The second engine fire in April was traced to a maintenance error that triggered a similar problem.

    The USMC responded to that incident by creating a modification kit for the EAPS unit, which was installed on each of the MV-22 Block Bs that deployed to Iraq.

    The Block A aircraft involved in the latest incident was not equipped with the modification kit.

    The V-22 programme endured four fatal crashes in development, prompting the Block A redesign to address concerns about hydraulic line chafing and susceptibility to the vortex-ring state phenomenon.


    Specifications (Rotodyne "Y")

    Fairey Rotodyne 3-view
    General characteristics
    • Crew: 3
    • Capacity: 40 passengers
    • Length: 58 ft 8 in (17.9 m)
    • Rotor diameter: 90 ft 0 in (27.4 m)
    • Height: 22 ft 2 in (6.76 m)
    • Disc area: 6,360 ft² (591 m²)
    • Empty weight: lb (kg)
    • Loaded weight: 33,000 lb (15,000 kg)
    • Max takeoff weight: 38,000 lb (17,000 kg)
    • Powerplant:
    o 4× rotor tip jet burning compressed air/fuel, () each
    o 2× Napier Eland turboprops, 2,800 hp (2,100 kW) each
    Performance
    • Maximum speed: 213 mph (343 km/h)
    • Range: 520 mi (830 km)
    • Disc loading: 5.2 lb/ft² (25 kg/m²)
    • Power/mass (prop): 0.17 hp/lb (280 W/kg)
    • Wing loading:

    Specifications (MV-22B)
    Data from Boeing Integrated Defense Systems[27], Naval Air Systems Command[28], and the CV-22 Air Force Fact Sheet.[29]
    General characteristics
    • Crew: two pilots
    • Capacity: 24 troops (seated), 32 troops (floor loaded) or 10,000 pounds of cargo
    • Length: 57 ft 4 in (17.5 m)
    • Rotor diameter: 38 ft 0 in (11.6 m)
    • Wingspan: 46 ft (14 m); 84 ft 7 in (including rotors))
    • Height: 22 ft 1 in (overall - nacalles vertical) (17 ft 11 in 5.5 m (at top of tailfins))
    • Disc area: 2,268 ft² (212 m²)
    • Wing area: 301.4 ft² (28 m²)
    • Empty weight: 33,140 lb (15,032 kg)
    • Loaded weight: 47,500 lb (21,500 kg)
    • Max takeoff weight: 60,500 lb (27,400 kg)
    • Powerplant: 2× Rolls-Royce Allison Rolls-Royce T406 (AE 1107C-Liberty) turboshafts, 6,150 hp (4,590 kW) each
    Performance
    • Maximum speed: 275 knots (316 mph, 509 km/h)
    • Cruise speed: 214 knots (246 mph, 396 km/h) at sea level
    • Range: 879 nmi (1,011 mi, 1,627 km) (unrefueled)
    • Combat radius: 370 nmi (430 mi, 690 km)
    • Ferry range: 2,417 nm (2,781 mi, 4,476 km)
    • Service ceiling: 26,000 ft (7,925 m)
    • Rate of climb: 2,320 ft/min (11.8 m/s)
    • Disc loading: 20.9 lb/ft² @ 47,500 lb GW (102.23 kg/m²)
    • Power/mass: 0.259 hp/lb (427 W/kg)
     
  2. I don't kmow about all the technical stuff, but they just don't look right!!! 8O
     
  3. The Fairey Rotodyne never killed anybody. The same can't be said of the V22! 30 dead and $65bn spent so far!

    Few helicopters do. Most don't actually fly. They are just so ugly they repel the ground!