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1984 46 viking 3 or 4 blade props

Discussion in 'Viking Yacht' started by Waytofast79, Dec 13, 2019.

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  1. Capt Ralph

    Capt Ralph Senior Member

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    In the back of my mind (way back there), I have accounted for the dynamics of the blades surface acting like a wing. However, this wing action works in a circle, lifting up, down, left & right.
    The only differences I could figure was the clean water and density on the blades in the lower swing. Shaft angle may help some also. Here is where a little extra performance may be found.

    My above comments have been towards; factory specs (diameter) and less sales propaganda.
    Vikings door are still open and support great. No comments on what they suggest yet.

    Here in the swamps, all kinds of snake oil has been tried on near anything that floats. We can't re-invent the wheel, but we can keep it clean with correct pressure was our lesson.
  2. chesapeake46

    chesapeake46 Senior Member

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    I thought 4 blades give a smoother ride while 3 blades give a better bite for better maneuvering to your slip.
  3. Capt Ralph

    Capt Ralph Senior Member

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    4 blades do offer less vibration.
    Not sure about better maneuvering but a good 3 blade is faster.
    Check #3 & 15 above.
  4. Boomer

    Boomer Senior Member

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    You just talked me out of going to 3 blades..thanks for saving me some money!
  5. Capt Ralph

    Capt Ralph Senior Member

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    Not sure who your thanking. If what you have 4 blade wheels; please offer some specs and performance numbers to help the thread.
  6. Boomer

    Boomer Senior Member

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    I have 4 bladed wheels now but pitch is way off....on list of things to do..original boat specs were 3 blades at 31 kts... I will be happy with mid 20s with the 4 blades
  7. Capt Ralph

    Capt Ralph Senior Member

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    What are you spinning (rpm)?
  8. Boomer

    Boomer Senior Member

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    Right now I am 24x20p...cruise at 1950 is 14kts...should be up another 4 or 5 kts
  9. Capt Ralph

    Capt Ralph Senior Member

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    High idle and wot RPMs?
    Mother in law on board?
  10. Capt Ralph

    Capt Ralph Senior Member

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    I think the p is a typo.
    20" is not enough diameter.
  11. Boomer

    Boomer Senior Member

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    20P is correct...had to start somewhere as the blades were all out of whack from a grounding at speed when the mathers ZF throttles failed to pull back...I now figure a 24P would be closer to where I need to be on 4 blades...work in progress...I dont have my #s available...but I do remember port hi idle was 2450 and stbd was 3100...a little tall
  12. Boomer

    Boomer Senior Member

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    TI
  13. Capt Ralph

    Capt Ralph Senior Member

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    24 is better, thank you for correcting me.
  14. Boomer

    Boomer Senior Member

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    NP....Merry Christmas Ralph!!
  15. Capt Ralph

    Capt Ralph Senior Member

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    Safe, Merry Christmas & New Years to you, my friend.
  16. Capt Ralph

    Capt Ralph Senior Member

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    Safe, Merry Christmas & New Years to All.