P-47 thunderbolt Throttle Quadrant Placard

Discussion in 'Other Mechanical Systems Tech.' started by T Bolt, May 7, 2010.

  1. T Bolt

    T Bolt Well-Known Member

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    #1 T Bolt, May 7, 2010
    Last edited: Jan 20, 2016
    47TQ.gif AN01-65BC-1A_Fig06_ThrottleQuadrant.jpg P47G_Left.jpg Does anyone know what is written on the placard mounted on the throttle quadrant mounting bracket on the P-47 Thunderbolt? I need to reproduce it and I have several pictures shown below but they show only the right ½ of the placard or not clear enough to see.
     
  2. Crimea_River

    Crimea_River Well-Known Member

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    #2 Crimea_River, May 7, 2010
    Last edited: May 7, 2010
    These might help. Piecing the pics together, it looks like"WARNING. This airplane has a supercharged engine. Take-off and operation must be in accordance with 'Operation Instructions' in Form 1"
     

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  3. T Bolt

    T Bolt Well-Known Member

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    D**m that was fast service Andy 13 minutes!!! THIS FORUM IS AWESOME!!!
    Thanks a million! That was exactly what I needed now have the whole text!
     
  4. Crimea_River

    Crimea_River Well-Known Member

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  5. Colin1

    Colin1 Active Member

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    Which version of the P-47 had a supercharged engine?
     
  6. Crimea_River

    Crimea_River Well-Known Member

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    All of 'em as far is I know. Turbo-supercharger to be exact.
     

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  7. T Bolt

    T Bolt Well-Known Member

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    #7 T Bolt, May 7, 2010
    Last edited: Jan 20, 2016
    p35-4a.jpg P-43%20-%20Small.jpg P-47b.jpg
    Yes that's right the Thunderbolt was built around the Turbo-supercharger starting with the P-43 Lancer which was a Turbo-supercharged version of the P-35 and from which the P-47 was developed. You can see the family resemblance below:

    P-35
    P-43 Lancer
    P-47B Thunderbolt
     
  8. Colin1

    Colin1 Active Member

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    They were all, to my knowledge too, turbocharged
    So turbocharged then, rather than supercharged. Where did this turbo-supercharger term originate?
     
  9. T Bolt

    T Bolt Well-Known Member

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    In a turbo supercharger, the supercharger is driven by a turbine which is powered by exhaust gasses from the engine. With straight supercharger such as in the Mustang or Spitfire the supercharger is geared directly to the engine.

    In the Thunderbolt the turbo supercharger was located in the lower rear fuselage and ducting lead the exhaust gasses back to the turbine and spun it, which spun the supercharger which compressed air and sent it back forward to the engine carburetor. The air return ducts can be seen in the side walls of the cockpit in some pictures. The speed of the turbo was controlled by exhaust waist gate valves located on both sides of the fuselage just behind the cowl flaps in front of the wing roots. When the valves were open the exhaust would be directed out at that point and the tubro would not operate. As the valve would open the exhaust would be directed back to the tubro. The farther open the valve the faster the tubro would spin. there was an indicator light on the control panel that would blink when the tubro was operating at optimum speed. the light would go steady when the tubro would reach max speed and the pilot would have to back it off until it was blinking again. It seemed to be a case of constant adjustment as the plane climbed to altitude.
     
  10. Crimea_River

    Crimea_River Well-Known Member

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    So I believe Turbo-Supercharger = Turbocharger
     
  11. Airframes

    Airframes Benevolens Magister

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    It was once explained to me that the name 'Turbocharger' came from the combination of terms describing the workings of a supercharger driven, or assisted, by exhaust gasses. The words 'themal' and 'turbulence' being used, refering to to the hot turbulent air ducted or drawn from the exhaust, hence 'Turbo', and then added to the Supercharger word, making 'Turbo-charger', commonly refered to as 'Turbocharger'.
     
  12. FLYBOYJ

    FLYBOYJ "THE GREAT GAZOO"
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    In layman's A&P terms - if it's engine driven, its a supercharger - If it's driven by exhaust its a turbocharger.
     
  13. T Bolt

    T Bolt Well-Known Member

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    Yes thats it in a nutshell.

    Supercharger = The device that compresses the air being fed into the carburetor, either engine or exhaust driven, but when referred to as just "Supercharger" is usually engine driven.

    Turbine = The device attached to the supercharger that catches the exhaust gasses and powers the supercharger.

    Turbo Supercharger =The turbine and the supercharger together are called the "Turbocharger", "Turbo Supercharger", or just "Turbo" for short. Andy posted an excellent picture of the Turbo Supercharger above.
     
  14. FLYBOYJ

    FLYBOYJ "THE GREAT GAZOO"
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    The thing to watch in a turbocharged aircraft was not to overboost during take off and I think that was the purpose of the placard. I've flown Turbo Cessna 210s and it took some getting used to not to slam the throttle full forward rapidly during take off.
     
  15. Colin1

    Colin1 Active Member

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    I'm happy with how both techniques work
    I was wondering at what point in history that silly term crept into the vocabulary when 'turbocharger' said it just fine
     
  16. T Bolt

    T Bolt Well-Known Member

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    I have a DVD of the P-47 training film from 1943 and in it the instructor explains the operation of the "Turbo Supercharger", many times when he is referring to it he calls it the "Turbo" I'm sure that some time later the term "Turbocharger" came in as it was somewhere in between the two other terms. My father who flew on B-24's from 1943 to 1945 used the term "Turbocharger"
     
  17. T Bolt

    T Bolt Well-Known Member

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    #17 T Bolt, May 10, 2010
    Last edited: Jan 20, 2016
    P5091940.JPG Just wanted to post a pic of the placard I made. Thanks again Andy!
     
  18. Crimea_River

    Crimea_River Well-Known Member

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    They look great Glenn, but I hate to say it looks like you missed the last couple of words "...in Form 1"
     
  19. T Bolt

    T Bolt Well-Known Member

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    I knew someone would catch that! :oops: I had to edit that line out or the placard would not have fit on the available space I had to mount it in the throttle quadrant bracket. I think my bracket is not as deep as it should be. It was one of the hardest parts to dimension from photos and then to make so I'm just going to have to live with it.
     
  20. rochie

    rochie Well-Known Member

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    i wont tell if you dont Glenn ! looks bloody good though, well done mate
     
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