Boom!

Discussion in 'Hangar Talk' started by FORANE, Nov 15, 2017.

  1. FORANE

    FORANE Pattern Altitude

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  2. SkyDog58

    SkyDog58 Final Approach

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    Old dog w/o new tricks
    Think it will be as much of a commercial and financial success as Concorde?

    :rolleyes:
     
  3. Clark1961

    Clark1961 Touchdown! Greaser!

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    It’s a lot further from the leading edge than Concorde in terms of technology. It also isn’t a high end jobs program for two states.

    Now the real question is can they attract the capital to move past the demonstration stage? If they can will an established manufacturer move into the niche with bigger muscles?
     
  4. Velocity173

    Velocity173 Final Approach

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    Mach 2 on non afterburning engines???
     
  5. denverpilot

    denverpilot Taxi to Parking

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    It’s interesting. Based at my home airport so they do press events and stuff from time to time.
     
  6. wilkersk

    wilkersk Cleared for Takeoff

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    I wanna see how those long legs fold up and fit inside that airframe. This rendering (CGI?) looks like quite the engineering marvel!

    [​IMG]
     
  7. Zeldman

    Zeldman Final Approach

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    Nothing like a sonic boom at 6am to get started in the morning.

    Last time I heard one was in 1992 when a space shuttle was landing at Cape Canaveral.

    Boom.....boom...!!!
     
  8. Velocity173

    Velocity173 Final Approach

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    Apparently these guys have designed the aircraft to produce a muffled boom. Not nearly as loud as a normal fighter / Concorde / Space Shuttle type. We shall see.

    I've heard the Shuttle also. Think there were a couple booms. Not too bad though since I was about 100 miles north of the Cape. Heard F-15s go supersonic over the house before that we're extremely loud and rattle windows.
     
  9. Cap'n Jack

    Cap'n Jack Final Approach

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    The F-22 does > Mach 1 on non-afterburning engines. They call it "super cruise". I don't know how much faster than Mach 1 it flies in super cruise.
     
  10. Velocity173

    Velocity173 Final Approach

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    Yeah the F-35 does as well but I've never heard of an aircraft this large that will be able to go supersonic in level flight without afterburners. Plenty can sustain it without burner but they need it to get through the drag of transonic.
     
  11. Clark1961

    Clark1961 Touchdown! Greaser!

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    I’ve read that the 22 is around 1.5 in supercruise. No idea how accurate that is.
     
  12. mscard88

    mscard88 Touchdown! Greaser!

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    Well then it probably isn't. I'm sure it's classified. For now anyway.
     
  13. nauga

    nauga Pattern Altitude

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    Concorde user burner to accelerate but cruised at ~2M without. Supercruise these days is more a matter if IR suppression than efficiency.
    Boom and all the other quiet supersonic platforms have regulatory hurdles far greater than the technology hurdle.

    Nauga,
    and the LBFD
     
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  14. Zeldman

    Zeldman Final Approach

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    There was definitely two separate booms, probably about half a second apart. And yes, it rattled everything. Car alarms were going off in the parking lot, dogs were barking. It was right about 6am and it woke up just about everyone. And of course the usual calls to the airport to complain about the noise....

    As a kid in the early 60s I remember lots of sonic booms. It was pretty much a normal thing. Always good for interrupting class for a few minutes.
     
  15. nauga

    nauga Pattern Altitude

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    There's a pressure wave off the leading edge of a supersonic body, and another off the trailing edge. The 'booms' you hear are these waves passing over you. With shaping you can tailor the pressure waves to be diffuse and less abrupt, 'softening' the boom, or to focus, and really rattle the snot out of stuff. Sometimes either one of these can also happen naturally (or by accident), breaking dishes and windows and careers.

    Nauga,
    lowering the boom
     
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  16. Ryanb

    Ryanb Final Approach PoA Supporter

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    A little off this topic, but isn’t it true that the SR-71 can fly coast to coast in 45 minutes?
     
  17. Clark1961

    Clark1961 Touchdown! Greaser!

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    No. The SR-71 cannot fly coast-to-coast in 45 minutes. It’s been grounded for a number of years now.
     
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  18. SoCal RV Flyer

    SoCal RV Flyer Pattern Altitude

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    Check it out:

    records.php

    L.A. to D.C., 2299.67 miles in just over 1 hour, 4 minutes. Average speed of 2144.83 mph
     
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  19. Ryanb

    Ryanb Final Approach PoA Supporter

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    Amazing! I remember hearing something about it’s incredible speed and performance on a documentary awhile back. Thanks!
     
  20. Zeldman

    Zeldman Final Approach

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    Had to. No bathrooms on board....
     
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  21. denverpilot

    denverpilot Taxi to Parking

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    I thought NASA still had one in flyable condition? Maybe they gave it up for Lent.
     
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  22. Briar Rabbit

    Briar Rabbit Pre-takeoff checklist

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    A friend of mine flew U-2’s and claimed there was a good rivalry with the Blackbird jocks. They bragged that they could fly faster than a 30-06 bullet. U-2 pilots responded “and just as far without refueling”.
     
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  23. nauga

    nauga Pattern Altitude

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    If lent started 15+ years ago and hadn't ended yet, maybe.

    Nauga,
    and his three-state turning radius
     
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  24. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    F-22 does have afterburner and published max speed is Mach 2.25. Supercruise is Mach 1.82
     
  25. jsstevens

    jsstevens En-Route

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    Maybe they need lots of penance....
     
  26. Sac Arrow

    Sac Arrow Touchdown! Greaser!

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    A paperclip on the runway would ruin your whole day, I bet.
     
  27. mscard88

    mscard88 Touchdown! Greaser!

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    Next door neighbor on base was a jet engine mechanic on T38s. Told me a straight pin infested into the engine would trash it. I think they didn't fly into known icing conditions either.
     
  28. Zeldman

    Zeldman Final Approach

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    There is a T-38 on a stick in front of the airport here. After looking at the wings I would think there is no room for ice.
     
  29. mscard88

    mscard88 Touchdown! Greaser!

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    I think it's more the engines on T38s can't take the ice than the wing. Maybe one of dem military pilots will clear it up for us. Seems I recall when I was at Columbus they wouldn't fly in icing conditions.
     
    Last edited: Nov 16, 2017
  30. nauga

    nauga Pattern Altitude

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    I don't know of any tactical airplane that's capable of or approved for flight in known Ice.

    Nauga,
    Over or around, never through
     
  31. Velocity173

    Velocity173 Final Approach

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    I remember with the Hornets, we had a waiver for them to go 350 KIAS below 10,000 ft to reduce icing accumulations. We were to expedite their climb / descent during forecasted icing to minimize exposure as well. As I recall it's almost an emergency type situation for them. Something about shedding ice from the LEX getting ingested in the engines???
     
    Last edited: Nov 16, 2017
  32. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    T-38's have engine anti-ice but no wing or stabilizer ice protection, that is why they cannot fly into known icing conditions.
     
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  33. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    So, an "all weather fighter" may not really be?
     
  34. EvilEagle

    EvilEagle Cleared for Takeoff

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    We can't fly into known icing but at the altitudes we normally fly in the Eagle, all the ice slips off anyway. Not enough moisture up there to keep it on the jet.

    T-38 is def not ok for ice. It's barely ok in the rain.
     
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  35. nauga

    nauga Pattern Altitude

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    I doubt you'll find anyone flying an all-weather intercept in a thunderstorm or hurricane either.

    Nauga,
    WOXOF
     
  36. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    I would bet that an actual ordered intercept sortie would be followed through no matter what the weather.
     
  37. mscard88

    mscard88 Touchdown! Greaser!

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    When I was at Columbus, as I mentioned, my neighbor was a engine mechanic on T38s and he told me a straight in ingested would tear up the engine. Seems ice would as well. I know we had a weather ship go up every morning to check out the MOAs for weather, etc. So T38s definitely have a limitation for icing conditions then?
     
  38. nauga

    nauga Pattern Altitude

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    Yes.

    Nauga,
    who has no desire to test it
     
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  39. mscard88

    mscard88 Touchdown! Greaser!

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    OK, but it's for the airframe and not the engine? I'm just curious. Thanks.
     
  40. nauga

    nauga Pattern Altitude

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    The restriction doesn't make a distinction between the two, and in practice there isn't a difference. A chunk of ice off the wing and down an inlet is going to ruin your day just as bad as ice that remains on the wing.

    Nauga,
    with a bang *and* a whimper