[Alberg30] Props

[Brian and Elaine Timmins]

  OK, so explain to me. When my slip was on the south side of the east-west pier, with a predominant southwest to west wind, and I reverse out to the south,the stern would always go to port. Last season, I moved to the north side of that same east-west pier, still predominant southwest to west wind, and now when I reverse out to the north, the stern always goes to starbord. Same boat, same engine, same prop, same procedures, same operator, same predominant wind, different direction, different result. (Protected marina, no real current to contend with)
   It appears obvious to me that the direction the boat backs to has more factors controlling it than just prop rotation direction induced prop walk.
Regards,
Brian   #497
  ----- Original Message ----- 
  From: James Davis 
  To: Alberg30 General List 
  Sent: Friday, February 01, 2002 9:34 PM
  Subject: [Alberg30] Props


  Don't blame the prop walk on two blades.  The increased prop walk is more from being able to spin it faster.  Those that have converted to diesels and get even more RPM on the prop in reverse get some very usable prop walk.  In fact the prop walk effect is probably the best way to steer when backing.  Assuming your boat backs to port (this can be different with a diesel) keep the tiller hard over for a right turn and by backing and filling, you can do a 360 in little more than the boats length.  Back - the stern goes to port.  Give it a goose ahead - the prop wash against the rudder nudges the bow to the right.  As soon as she starts going ahead, back hard for a few seconds - the stern jumps to port.  Keep it up and it is easy to turn around.   Note that this can be slow with the Atomic 4 and the original prop.
  Jim Davis
  Isa Lei
  A30 240
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.alberg30.org/pipermail/public-list-alberg30.org/attachments/20020202/03ae9870/attachment-0008.htm>