What does this "+" mean?

Discussion in 'Warbirds / Warbird Replicas' started by TXFlyGuy, Aug 25, 2019.

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  1. Aug 25, 2019 #1

    TXFlyGuy

    TXFlyGuy

    TXFlyGuy

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    On some P-51's near the data block, you will see a + sign.
    I have been told it is simply a reference mark. And the latest explanation is that it represents "extended range". Like a B-777-200ER (Extended Range). I doubt it, but not sure.

    What say you?

    See it on this replica pictured:
    P1030796.JPG
     
  2. Aug 25, 2019 #2

    TXFlyGuy

    TXFlyGuy

    TXFlyGuy

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    Ok...just heard from my expert friend on all matters P-51.

    The "+" sign is simply a leveling mark, used to assist when sighting in the guns. Also used to help with rigging of the aircraft.
     
    Aerowerx, Pops and SVSUSteve like this.
  3. Aug 25, 2019 #3

    SVSUSteve

    SVSUSteve

    SVSUSteve

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    I had always wondered what exactly it was used for. Thanks!
     
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