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turboshaft

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Viewing 15 posts - 136 through 150 (of 199 total)
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  • in reply to: X-45As Completes Graduation Combat Demonstration #2605998
    turboshaft
    Participant

    Don’t get me wrong, I’m not questioning the rationale of UCAVs in general – it’s just that I’ve seen enough projects ‘grow’ themselves into cancellation that I have serious doubts as to the current direction J-UCAS is going. The ‘original’ UCAV designs from the 1990s (8-12K weight, SSB payload) seemed to offer a better justification than an F110-powered X-47B. We’ll have to wait & see whether it survives.

    Indian1973 & Tmor – you might want to have a look at the new ducted-fan UAV proposed by Kestrel Aerospace in the UK. I’m sure I saw the same design in T3…!

    in reply to: GE F120 question #2606122
    turboshaft
    Participant

    The F120 used a combination of a fixed bypass between the first and second stages of the compressor (all-axi, to answer Over G’s question) with blocker doors on the fan duct which when closed allowed the transition to a leaky turbojet for supersonic cruise flight. OPR was approx. 35. The F136 derivative (alternate engine for the F-35), although based on the F120 core, is a non variable cycle engine (though there *were* rumors as to the use of YF120 tech post-ATF deselect…).

    in reply to: Tri-engine fighter? #2606162
    turboshaft
    Participant

    The MiG SM-50 (MiG-17 with a liquid rocket) came close, as would have the rocket-equipped Lightening (though since it was a double Scorpion, I guess that would have been four…).

    The most insane three-engine fighter has to be the Polikarpov I-152/DM-2. A biplane with two ramjets. That’s what comes of state-sponsored vodka !

    in reply to: X-45As Completes Graduation Combat Demonstration #2606183
    turboshaft
    Participant

    Unmanned air vehicles flying simulated missions. I miss the good old days of Buffs dropping sticks of Mk117s !

    I’m still not convinced whether the larger X-45C (and the even larger X-47B) are the way to go. With systems this expensive – and the USAF has admitted that the initial acquisition cost of UCAVs will actually be pretty similar to manned a/c – will forces really be willing to risk them in dull, dirty and DANGEROUS missions like SEAD ?

    in reply to: Identify these? #2606542
    turboshaft
    Participant

    The three Hueys are all 214 Ishafans (the IAF also has a handful of AB212s, which look similar from the frontal angle (with near-identical intake/fairing contours), but I’m fairly sure all your birds are Lycoming powered).

    The two ‘civvy’ birds are the Panha 2061 (reverse-engineered AB206 JetRanger, subsequently ‘replaced’ by the equally-reverse-engineered Shahed-274 and Shahed-278) and Panha 2-75 Shabaviz (reverse-engineered AB205A Huey).

    in reply to: Identify these? #2608855
    turboshaft
    Participant

    The two birds in the air are Bell 214 Isfahans. The aircraft on the ground is an AB205 (or a locally-produced Shabaviz 2-75. My money’s on the former !).

    in reply to: (First Post) What in Lockheed is this? #2609409
    turboshaft
    Participant

    There’s a clue on the rear fuselage 😀

    You say tomato, I say tomato, Boeing says joined wing, Lockheed Martin says box wing (“now with wing[let]s”).

    in reply to: Mil Mi 24 questions #2609804
    turboshaft
    Participant

    Some good pics and first-hand insights into flying the Hind here: Pprune Mi-24 thread

    in reply to: (First Post) What in Lockheed is this? #2609866
    turboshaft
    Participant

    Probably one of their Common Support Aircraft (CSA) proposals. CSA ran out of money, and the role has reverted back to the E-2, S-3 and F/A-18E/F.

    in reply to: Mil Mi 24 questions #2609955
    turboshaft
    Participant

    Most figures suggest 700 in service. How many of those are actually operational is another matter…!

    in reply to: Typhoon IRST #2610988
    turboshaft
    Participant

    Can’t comment on the new lid, but the IRST will be fitted to the fleet downstream (I’d guess 2007/8). The PIRATE sensor package was not intended to be available for IOC, but will be part of the multi-role FOC spec. Productionization contract was awarded last year.

    Good to see the Euros have twigged onto the block concept (“No congressman, it’s not late, it’ll just be added in a later block…”) :diablo:

    in reply to: Apaches questions #2611639
    turboshaft
    Participant

    It’s a fluid number because of operational losses, but in summary the Army acquired 821 A models, of which 501 have already been upgraded to D standard, with another 96 As (out of the total remaining fleet of 213) currently undergoing upgrade.

    At the conclusion of its recently-launched Block III upgrade, the Army plans to have a total fleet of 597 AH-64D Block III Apaches, with 117 AH-64As remaining unmodified (and with total losses and cannibalized assets equaling 107 aircraft).

    in reply to: The greatest submarine design ever. #2092307
    turboshaft
    Participant

    I was ignoring Albacore since she was only an experimental vessel.

    in reply to: The greatest submarine design ever. #2092330
    turboshaft
    Participant

    SSKs aside, I’d nominate Skipjack as one of the most influential designs, since it represented a substantial leap-forward in hull design and speed. Okay, it wasn’t perfect (notably wrt acoustics), but for its time it was a major breakthrough.

    Most successful ? Much as I’d like to nominate one of the deep-diving Russian SSNs, I would have to choose the Ohio class. They don’t get as much attention as the SSNs or SSKs in the post-Cold War era, but the fact that these vessels are still pretty much unchallenged 30 years after being designed speaks volumes for their total system design.

    in reply to: USAF F-4E vs. RAF F-4M (Phantom FGR.2) #2612035
    turboshaft
    Participant

    Couple of points. Firstly, if you believe the marketing speel, the Skyflash was a wunder-missile, with significantly better capabilities than the E model Sparrow. It was probably out-ranged by the AIM-7F/M (of little relevance given real-world ROE), but its targeting capabilities were allegedly still comparable with the newer missiles.

    Secondly, IIRC the F-4M was a genuine swing role aircraft. Little in the way of guided ASMs, but it trucked a fair number of BL755s across Welsh firing ranges.

    That said, the slats and internal M61 do it for me.

    Great choice of pics for comparison btw.

Viewing 15 posts - 136 through 150 (of 199 total)