prop tips?

Discussion in 'Painting Questions, Tutorials and Guidebooks' started by ellis995, Feb 11, 2014.

  1. ellis995

    ellis995 Active Member

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    Hi guys

    what is the correct size for the yellow tips on 1/48 props.
     
  2. Airframes

    Airframes Benevolens Magister

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    The yellow prop tip markings on RAF and USAAF aircraft were 4 inches Keith, so in 1/48th scale, a touch over 2mm will do.
     
  3. Wurger

    Wurger Siggy Master
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    The exact quotient is 2.13333mm. :)
     
  4. Airframes

    Airframes Benevolens Magister

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    Heck, I have trouble seeing one millimeter, so no chance with .13333 !!!
     
  5. nuuumannn

    nuuumannn Well-Known Member

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    Wurger's been messing about with his vernier calipers again.
     
  6. N4521U

    N4521U Well-Known Member

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    I thought it was more like 6" but 4" seems more like it.
     
  7. ellis995

    ellis995 Active Member

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    Thanks Terry
     
  8. Wayne Little

    Wayne Little Well-Known Member

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    there probably was variation...
     
  9. Wurger

    Wurger Siggy Master
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    Nope... I used a piece of paper and a pencil. But you may use a calculator if there is a problem with the mathematics. :lol:
     
  10. stona

    stona Well-Known Member

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    #10 stona, Feb 12, 2014
    Last edited: Feb 12, 2014

    Not much. It was an Air Ministry Directive, though the version I have is from 1944, long after the practice was introduced. I have heard and read first hand accounts from both restorers and archaeologists which confirm that 4" was the standard adhered to.

    The marking was applied at the point of production and orders is orders :) Why take a chance on having the blade rejected by a MAP inspector?

    Cheers

    Steve
     
  11. Airframes

    Airframes Benevolens Magister

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    Steve is correct. There was no variation from the time the yellow tips were first introduced. The tips were, of course, a safety warning, to assist in the reduction of casualties, mainly fatal, caused by personnel walking into the arc of a spinning prop. (I've seen it happen, and it's not pretty).
    A tip colour greater than 4 inches (100mm) can be counter-effective, as the increase in size of the yellow-coloured area can actually diminish the effect of indicating the outer extremity of the prop arc.
    However, when the 'modern' variant of white/red/white, or red/white/red was introduced, mainly in order to be more visible on a light silver-grey or polished metal prop, then the depth could be increased to six inches, depending on the span and chord of the prop blade(s).
    On propellor aircraft used by the RAF for Air Cadet or University Air Squadron students, post war from the 1970's, the warning effect was increased even further, by having the entire front face of each prop blade finished in black/white bands the length of each blade, the reasoning being that such 'pupils', being young and not accustomed to the environment of a 'live' airfield, could possibly be more at risk.
     
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