June Launchings

Comments

• Hi Michael,
  Harmen is a fellow Kiwi - I’ve been following his rebuild and relaunch with interest. Cool boat aye?
  Harmen just posted something from an old AYRS article on a proa - which had pivoting bow/stern sections both ends:

  Wow - I had asked you if your Beach Cruiser style integrated rudders could be used on both ends of a proa - seems someone already tried that back in 1969!

  Harmens blog:
  http://harmenhielkema.blogspot.com/

  picture of bow/stern/rudder:

  

  Putting the pivot at the flat leeward side of hull would at least reduce the turbulence / drag?

  cheers, Dave

  Posted by  on  07/20  at  05:37 PM

• Hi Dave, thanks for the link to Harmen’s article. I agree that putting the pivot on the lee side should help with turbulence reduction, though I’m still not too thrilled about that big gap up there, which essentially makes sure that the hull has no possibility of laminar flow. I recall reading somewhere (can’t recall the source) that a decent multihull should be able to achieve laminar flow over at least 50% of the hull length.

  Posted by  on  07/21  at  12:12 PM