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Phaid

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Viewing 15 posts - 1 through 15 (of 337 total)
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  • in reply to: Russia moving tac air troops to Syria #2133951
    Phaid
    Participant

    Don’t the Russians have S400s there? If they knew about the strike with an hour’s warning, why didn’t they just knock down the missiles?

    in reply to: F-35 News and discussion (2016) take III #2160989
    Phaid
    Participant

    Also the arresting system has to be able to be configured to have a lower cable tension to stress the aircraft less. I don’t think the current system can do that, although the new arresting system of the Ford class might have that ability.

    The arresting gear on USN carriers has been able to do that for decades. The arresting gear is adjusted for every aircraft that comes aboard; the pilot announces the type and fuel weight and the arresting gear crew adjusts the gear accordingly. This is why the arresting gear brings every aircraft to a stop at nearly the same spot regardless of type, weight, or speed.

    However, the stress from arrested landings is only a part of the problem; the impact with the deck puts more stress on the airframe than the arresting gear does.

    in reply to: F-35 News and discussion (2016) take III #2161428
    Phaid
    Participant

    Note that the items that are not “common” are structural.

    Right, and that goes back to the structural differences between the A and the C, and why you can’t just swap a few components from the C onto the A and have a carrier-capable A. Theoretically that would have been possible with e.g. the F-4 or A-7.

    In any event, the concept wouldn’t work because of safety issues. USN pilots will use the Magic Carpet system but they will still have to train and be capable of fully manual arrested landings. It’s a basic requirement, otherwise you would start losing aircraft and possibly pilots due to computer problems, airframe damage, or weather beyond the system’s ability to compensate. If you really want a land-based force of F-35s that can be carrier-based in a pinch, you need F-35Bs. Which, of course, we have.

    in reply to: F-35 News and discussion (2016) take III #2162308
    Phaid
    Participant

    No problem with that, the plane would be a hybrid, take what you want from the C.

    That wouldn’t work at all. You can’t just slap beefed up landing gear on an A and expect it to survive carrier landings, especially since the approach speed would be higher than the C’s (but even if it weren’t it would still not be possible). The entire airframe structure would have to be reinforced. You might as well just get the Air Force to buy C models.

    in reply to: BAe Hawk and canopy locks #2181530
    Phaid
    Participant

    “Oi! Come back here with that aircraft!”

    in reply to: turbofan engines and their intakes #2219737
    Phaid
    Participant

    if the air flow to the engine is subsonic, regardless of actual speed the plane itself flies (lets say it goes mach 1.5) nonafterburning turbofan should still perform to the best of its ability. is that not so?

    Not sure what the question is there. A turbofan will always perform better at subsonic speeds than supersonic, simply because the airflow is reaching the engine with the highest pressure. Once it goes supersonic, there will always be some degree of loss of pressure due to turbulence. Good intake design minimizes this, but cannot eliminate it completely.

    or is there some thing that prevents the fan section from pushing the air from the engine at velocities higher than mach 1? if so, what prevents it?

    Nothing prevents it, it is required in order for the airplane to fly supersonically. It’s simple physics, F=MA. The intake decelerates the air to subsonic speed; this creates ram drag which is a decelerating force. In order for the airplane to maintain speed, the engine must accelerate the air to at least the same speed the airplane is moving to counter the force from the ram drag. In order for the airplane to accelerate, the engine must accelerate the air to more than the airplane’s speed. This again ignores all the other forms of drag that act on an airplane, so in reality the engine has to accelerate the air considerably more than that.

    in reply to: turbofan engines and their intakes #2219897
    Phaid
    Participant

    All turbofan and turbojet engines require subsonic airflow to the fan. So air intakes for supersonic aircraft must be designed to slow down the airflow, while at the same time minimizing drag and airflow disruptions. This is a difficult task.

    Ideally, the intakes would maintain the airflow reaching the engine at a constant pressure, so that it could generate maximal thrust at any speed. This is not really possible. As the speed increases, pressure losses due to shockwaves reduce the engine efficiency, and ram drag caused by slowing down the air increases. Eventually the ram drag exceeds the thrust the engine is able to produce. Of course, in reality there is more than just ram drag acting on the engine, so ram drag alone is not the limiting factor in supersonic speed.

    in reply to: Low Level…… #2237299
    Phaid
    Participant

    “We were inverted…”

    in reply to: Regarding F-15 s combat record #2251468
    Phaid
    Participant

    As to earlier upgrades, there was also the APG-70 for later C models.

    The last 43 F-15Cs produced were equipped with APG-70. However, all of the APG-70 F-15Cs were later refitted with APG-63(V)1 and the APG-70s used for spares on the F-15E fleet.

    Also, 18 F-15Cs in Alaska were equipped with APG-63(V)2 AESA sets. They are still operational with these sets, but this was more of an experimental / validation deployment and never intended for flee-wide upgrade. The APG-63(V)3 performs better and is lighter than the (V)2.

    in reply to: F-35 News, Multimedia & Discussion thread (3) #2261903
    Phaid
    Participant

    You can bet your life that F-22s operating in Korea are wearing their luneburg device = rcs no different to an airliner.

    These ones certainly are.

    in reply to: Heavy bombers role in conventional warfare, what's needed #2212504
    Phaid
    Participant

    Saturation bombing worked in WWII because it was easy to find the enemy. If you wanted to destroy German civilian infrastructure to make them lose the will to fight, or destroy German industry to deny them resources, you bombed Germany. There is no ISIS-land to bomb and no cities or industrial centers populated entirely by ISIS people. As such, saturation bombing of the cities where ISIS is known to operate is unlikely to significantly harm ISIS but guaranteed to kill a whole lot of innocent civilians. It is really annoying when your enemy doesn’t cooperate with your desire to use 70-year-old air warfare doctrine by arranging themselves in easy-to-find strategic targets, but unfortunately that’s the reality we have to deal with.

    in reply to: Heavy bombers role in conventional warfare, what's needed #2212625
    Phaid
    Participant

    Yes, completely. The fight against ISIS is motivated mostly by the humanitarian threat they represent. You can’t defeat that by causing even more civilian casualties.

    in reply to: Heavy bombers role in conventional warfare, what's needed #2212757
    Phaid
    Participant

    Not at all. High dash speed is extremely useful even in loitering missions. Your bombers can’t be everywhere at once, so being able to go supersonic to respond to a call for air support is extremely useful. B-1s did this numerous times in Afghanistan; their speed also allowed them to orbit over the Arabian Sea and dash in when needed.

    in reply to: Female Aviators #2212829
    Phaid
    Participant

    US:

    [ATTACH=CONFIG]232743[/ATTACH]

    in reply to: Best aircraft for the current mission against IS #2213137
    Phaid
    Participant

    Definitely. But it’s a lot easier to sneak a bunch of operators into a city under siege.

Viewing 15 posts - 1 through 15 (of 337 total)