Propeller blade to identify

Discussion in 'Technical Requests' started by Kurtl, Mar 31, 2012.

  1. Kurtl

    Kurtl Member

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    Can anyone identify this prop blade? It's size is about 170 cm, but it's bendet a little. There is something like a weight balancer on the bottom. I don't know what this is either. Any help is apprechiated. Regards - Kurtl
     

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  2. A4K

    A4K Well-Known Member

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    Shape looked familiar, was thinking VDM from either 109G or Fw 190, so checked the net:

    VDM 9-12153 A, 3.3 m circumference; one of 3 props authorised by BMW for Fw 190A/F/G series aircraft. Same prop as VDM 9-12067 A, difference being the external weights.
     
  3. vikingBerserker

    vikingBerserker Well-Known Member

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    That's pretty sweet!
     
  4. Airframes

    Airframes Benevolens Magister

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    Certainly looks like a late '109 blade, but not sure about those flanges, weights or whatever. Balance weights were normally disc-like, but of course there are/were variations.
     
  5. Kingscoy

    Kingscoy Member

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    Hi,
    I have seen several of these weights on Fw 190 props we excavated. I believe they counter act unwanted vibration in the prop.
    Cheers,
    Sander
     
  6. Airframes

    Airframes Benevolens Magister

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    Good info Sander. Yes, the weights are for balancing the prop blade, and can be seen clearly on some props which don't have a spinner covering the hub. They are often in the form of a disc, rather like an ice-hockey puk, and are known as 'bob weights'.
     
  7. Kurtl

    Kurtl Member

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    Thanks Gentlemen for your interest. So those "weights" were used as counterweights if one prop blade has less weight than the other two, right?
    I wonder if there is any manual about VDM that shows all different types of prop blades. What's the difference between VDM 9-12153 A and VDM 9-12067 A?
     
  8. FLYBOYJ

    FLYBOYJ "THE GREAT GAZOO"
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    Just a guess, but I would think the weights would also put the prop in low pitch should the prop fail in flight.
     
  9. A4K

    A4K Well-Known Member

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    According to that net info I posted, the weights.
     
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