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Thread: B17 crash report...

  1. #16
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    Default Re: B17 crash report...


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    Excellent point, and if I'd engaged brain before fingers I'D have realised. Why not automatic though? And how does the pilot know how lean or rich the mixture is?

  2. #17
    Should Get Out More balbas's Avatar
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    Default Re: B17 crash report...

    Quote Originally Posted by cheb View Post
    Excellent point, and if I'd engaged brain before fingers I'D have realised. Why not automatic though? And how does the pilot know how lean or rich the mixture is?
    Modern piston engined aeroplanes have single lever operation - a single power lever like the accelerator in your car, and a computer manages the mixture and the propelllor constant speed unit.

    PPL candidates were (and my still be for all I know) taught to pull the mixture back slowly until the motor runs rough, and then push it back in 1/4 of an inch. It always seemed inexact to me.

    As an aside I nearly threw an aeroplane in the sea when I was a student pilot - I wanted to descend, so reached out to close the throttle (I was looking out of the window at an interesting yacht at the time), and pulled the mixture control to lean / cut off by mistake...

  3. #18
    Should Get Out More ZRX61's Avatar
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    Default Re: B17 crash report...

    Quote Originally Posted by cheb View Post
    Excellent point, and if I'd engaged brain before fingers I'D have realised. Why not automatic though? And how does the pilot know how lean or rich the mixture is?

    Some have auto lean/auto rich. Pilot knows how lean/rich the mixture is by having knowledge of the manual & looking at the position of the lever.


  4. #19
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    Default Re: B17 crash report...

    Quote Originally Posted by cheb View Post
    Excellent point, and if I'd engaged brain before fingers I'D have realised. Why not automatic though? And how does the pilot know how lean or rich the mixture is?
    Modern ones are automatic.

    Alot of the electronic controls you get in modern cars started out life in aircraft with FADEC ("Full Authority Digital Engine Control") and the like. We even use the term "fly by wire" in cars now.

  5. #20
    Should Get Out More icarus1859's Avatar
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    Default Re: B17 crash report...

    My old bike has manual air/fuel ratio lever and manual advance/retard ignition - as well as all the other controls you would be familiar with, like clutch, throttle, switches, decompression lever, etc.

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  7. #21
    Should Get Out More ink ink's Avatar
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    Default Re: B17 crash report...

    Quote Originally Posted by icarus1859 View Post
    My old bike has manual air/fuel ratio lever and manual advance/retard ignition - as well as all the other controls you would be familiar with, like clutch, throttle, switches, decompression lever, etc.
    You shouldn’t have to use the air lever, except as a cold start device, on a mid-1930s bike.

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    Should Get Out More Tomcat's Avatar
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    Default Re: B17 crash report...

    Quote Originally Posted by icarus1859 View Post
    My old bike has manual air/fuel ratio lever and manual advance/retard ignition
    Yeah, I was going to mention this. Older vehicles had manual controls for stuff like this, in the days before trickery like auto advance mechanisms and cold start circuits. On older aircraft it persisted because pilots (or designers, dunno which) felt happier having full manual control of engine management parameters.

  9. #23
    Should Get Out More Horse's Avatar
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    Default Re: B17 crash report...

    Quote Originally Posted by Horse View Post
    There was an astonishing article (no longer online) written by two US pilots about gung-ho display pilots who put their (and others) lives at risk during displays. Even more surprising was that, after pointing out all of the failures, both authors died in air display crashes.
    Online here

    PDF here (copied when it was on the FAA web site)

  10. #24
    Should Get Out More RiceBurner's Avatar
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    Default Re: B17 crash report...

    Quote Originally Posted by ink ink View Post
    You shouldn’t have to use the air lever, except as a cold start device, on a mid-1930s bike.

    Depends on the bike. Ride a 1910 Triumph and you'll be playing with all of them all the time just to keep it going. Not that much different in the '30s. (but better I'll admit that).

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