Interesting rudder shape

Discussion in 'Hydrodynamics and Aerodynamics' started by rubenova, Nov 3, 2022.

  1. rubenova
    Joined: Aug 2011
    Posts: 91
    Likes: 4, Points: 8, Legacy Rep: 49
    Location: Fidalgo Island, WA

    rubenova Junior Member

    I've never seen one of these. Seems like it would increase drag. Thoughts? Is it a really good design or sold by a really good salesman?

    a.JPG a1.JPG
     
  2. comfisherman
    Joined: Apr 2009
    Posts: 343
    Likes: 149, Points: 43, Legacy Rep: 10
    Location: Alaska

    comfisherman Senior Member

    Lot of the early to mid 80s Bristol Bay boats had the split wedge style rudders. Think our first power skiff had one originally as well, was told it was done to keep the rudder from pulsing in the natural slop of old mechanical systems. But I've heard reasons ranging from it helping turn in deep tunnels to helping reverse maneuvering.
     
  3. rangebowdrie
    Joined: Nov 2009
    Posts: 191
    Likes: 67, Points: 28, Legacy Rep: 10
    Location: Oregon

    rangebowdrie Senior Member

    They were an attempt to minimize the tendency of "prop walk", in order to provide a neutral helm.
    Kind of a fixed trim tab, if you will.
     

  4. rubenova
    Joined: Aug 2011
    Posts: 91
    Likes: 4, Points: 8, Legacy Rep: 49
    Location: Fidalgo Island, WA

    rubenova Junior Member

    Thanks!
     
Loading...
Similar Threads
  1. rwatson
    Replies:
    1
    Views:
    2,345
  2. JerryWo
    Replies:
    4
    Views:
    663
  3. seandepagnier
    Replies:
    16
    Views:
    2,422
  4. Claudio Valerio Parboni
    Replies:
    0
    Views:
    1,034
  5. Dave_S
    Replies:
    4
    Views:
    1,185
  6. Dave_S
    Replies:
    7
    Views:
    1,605
  7. 23feet
    Replies:
    3
    Views:
    1,775
  8. WildCard
    Replies:
    20
    Views:
    4,961
  9. Howlandwoodworks
    Replies:
    9
    Views:
    2,248
  10. KeithO
    Replies:
    6
    Views:
    1,865
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.