View Single Post
  #1   Report Post  
Morgan Ohlson
 
Posts: n/a
Default Bow dipping - Circle of hell ?


There are more events, but this may cover the basic ´hell circleˇ.

Does it look rational!?

--------
Heel = Too wide stern = Push bow to dip leewards = Keel alpha
reduced = Keel lift reduced (or negative) = real travel towards
weather decreased = way lost = heading course lost = rudder
towards weather applied = less rudder alpha = less rudder lift =
real travel towards weather decreased again = Circle restarts at ´Too
wide sternˇ again =
-------

Dipping bow must always be chased with extra rudder towards weather (lower
rudder alpha or negative):

1) which_ doesn't_ allow_ rudder_ to work_ as_ LA_ at_ all.

2) a stable lifting flow around the keel can't be steadily kept.

3) Likely, what in flight is called ´pilot induced flutterˇ will occure
(although triggered by the dipping bow) with heavily performance reduction
as result. AND also...

4) may trigger the captain to extreme focus on stearing because of zig zag
travel. ...AND ...

5) It will reduce seaworthiness AND ...

6) reduce maneuverability.


Secondary thought: With this problem situation with a wide stern one realy
must ask, is ever a theoretical dynamic ´foil shapedˇ hull the rational
choice compared to more practical laws of sailing?

OR should also a dinghy be a double ender?


Morgan O.