Boat Design Forums  |  Boat Design Directory  |  Boat Design Gallery  |  Boat Design Book Store  |  Thanks to Our Site Sponsors

Go Back   Boat Design Forums > Construction > Boatbuilding > Wooden Boat Building and Restoration
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 03-31-2009, 05:08 PM
IONA IONA is offline
Junior Member
 
Join Date: Mar 2009
Rep: 10 Posts: 6
Location: Louisiana
Help on my Keel

She's a 57' George Beuhler designed cruiser and I am nearing the end of building the keel. My engine is a DD4-71 and I have a 2" shaft to a 28-20 3-bladed RH prop. The keel is 11" thick. My question is what is the best way of carving that big thick keel in the area around the cutless bearing housing so as to maximize flow over the prop and minimize the kick of the prop as well. I assume I will want to carve what, viewed from the stern, would look like an "S" shape, with the shaft coming out in the middle of the "S" but my question is, which way will the prop kick the boat? And which way should the "S" face? Should it look like a standard "S" viewing her from the stern, or a reversed "S", and why? If this is not a clear question please view my little attached drawing.


View my progress at this album page:
http://picasaweb.google.com/GreyFox1931/GregSBoatyard#
Attached Thumbnails
Help on my Keel-s-cuts.jpg  
Reply With Quote
  #2  
Old 03-31-2009, 06:29 PM
PAR's Avatar
PAR PAR is offline
Yacht Designer & Builder
 
Join Date: Nov 2003
Rep: 2891 Posts: 8,792
Location: Eustis, FL
Prop walk is a fact of life with single screw applications. You actually want to whittle down the deadwood assembly on both side as well as top and bottom, to offer the best flow you can to the prop.

Typical Beuhler designs fancy a big ass deadwood assembly, which will limit maneuverability a good bit. A near 60' yacht will want a bow thruster to tuck in around docks or tight anchorages.

Starving one side of the prop to gain a slight boost in efficiency isn't a reasonably approach.
Reply With Quote
Reply



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Keel strut and keel trunk construction brevell Fiberglass and Composite Boat Building 0 11-20-2006 12:01 PM
Converting Shoal Keel to Centerboard-Keel mcollins07 Sailboats 4 06-29-2006 06:22 AM
Fin Keel to Lifting Keel on my Columbia 28 SteveWinNH Sailboats 5 04-05-2006 06:35 AM
Keel Foils (optimizing a 70's keel) ErikG Sailboats 9 06-28-2004 10:58 PM
Replacing an iron keel with a lead keel. Kris-Stockholm Boatbuilding 4 06-21-2004 01:45 PM


All times are GMT -5. The time now is 08:58 AM.


Powered by: vBulletin Copyright ©2000 - 2012, Jelsoft Enterprises Ltd.
Web Site Design and Content Copyright ©1999 - 2012 Boat Design Net