[PUP] Emergency tiller

[bob england]

Yeah Scott, it's obviously your fault, not the makers. :) ;).> Date: Tue, 18
Mar 2008 17:11:47 -0700> From: jim at nordhavn.com> To:
passagemaking-under-power at lists.samurai.com> Subject: Re: [PUP] Emergency
tiller> > Dear Scott:> > I personally have over 15,000 miles on both of the
40s that we have owned and> I can tell you with absolute confidence that the
N40 steers beautifully under> all conditions. I have video of the boat running
down swell during gale> conditions in the Pacific and then even tougher
conditions in the> Mediterranean and it shows the boat tracking straight with
little yaw despite> the steep and high seas coming up astern . We all marveled
that during our> around the world voyage on N40#21 there was never one time
when the boat had> to be hand steered during the many gales and a few storms
we encountered.> > I understand that you believe the boat is steering badly
with the fins> centered and locked and if your observation is correct then I
suggest that you> have air in your steering system. Your boat is equipped with
Hynautic> equipment and the bleeding process is relatively easy but you must
do it> exactly as stated by Hynautic within their operators manual.> > The
problem is easy to understand if you think of it in simple terms. A> hydraulic
steering system free of air provides precise steering with very> little play.
A system with air entrapped within is mushy and has lots of play.> When you
initially apply rudder the forces against the rudder are at their> greatest.
As the boat begins to turn and momentum is developed the force on> the rudder
is slightly reduced. If you have air in the system and the rudder> is
initially deflected the air within the steering system compresses until the>
compression is sufficient to move the rudder. As the force against the rudder>
is reduced after the turn is initiated then the compressed air causes the>
rudder to move farther with no further input from the helm.> > This is
particularly true when running in any kind of sea. As the sea rolls> under the
boat it tries to turn the boat until the helmsman or autopilot> recognizes
what is happening and the rudder is deflected to stop the turn and> bring the
boat back on course. The boat is turning and momentum has developed.> The
rudder is deflected and the loads against are significantly more that what> is
required in a turn from a straight line due to the momentum which has to be>
overcome. The helm is turned and the air compresses against the heavily
loaded> rudder just to stop the turn in progress. As the turn stops the load
is> reduced the air expands, the rudder moves even further. As the turn is now
in> process the momentum is established and the load on the rudder is further>
decreased. Again the air expands and the rudder moves even farther causing
the> boat to turn too far. Finally big counter rudder is applied to stop the>
excessive turn and then the process repeats itself over and over.> > Before
you condemn your boat to the world I suggest you carefully go through> the
process of bleeding the steering system and I'm certain that if your boat> is
indeed steering badly with fins locked and centered - air is the problem> and
you will see a remarkable improvement.> > Best Regards,> > Jim Leishman> >
-----Original Message-----> From:
passagemaking-under-power-bounces at lists.samurai.com>
[mailto:passagemaking-under-power-bounces at lists.samurai.com] On Behalf Of>
Scott Bulger> Sent: Saturday, March 15, 2008 4:14 PM> To: Passagemaking Under
Power List> Subject: Re: [PUP] Emergency tiller> > on the Trac units I run
them either Active or Off. If Off they are> also pinned in place, they do not
move. The boat, with the fins off> and pinned wanders all over the sea like a
sailor on shore leave in> the Roja district.> > What more can I say?> > Scott>
> > On Sat, Mar 15, 2008 at 3:12 PM, Ron Rogers <rcrogers6 at kennett.net>
wrote:> > Let me be more clear. On my ancient Naiads there be "Off" and
"Centered"> and> > "On." "Centered" on my boat means that the system is on and
hydraulic> > pressure is holding the fins rigid - locked. This can also be
done with the> > pins provided. Mine can move around when the system is
"Off."> >> > I noticed the difference both when heading into 5 and 6 foot seas
and when> > docking, My boat handles better when docking (astern) if the
Naiads (Model> > 252) are "Centered."> >> > Ron> >> > ----- Original Message
-----> > From: "Scott E. Bulger" <scottebulger at gmail.com>> > To:
"'Passagemaking Under Power List'"> >
<passagemaking-under-power at lists.samurai.com>> > Sent: Saturday, March 15,
2008 4:35 PM> > Subject: Re: [PUP] Emergency tiller> >> >> > | As I said:> >
|> > |> > | "it does it with our without the fins active."> > |> > | Wanders
like the eyes of a teenage boy at the prom...> > |> > | Scott> > |> > |> > |
-----Original Message-----> > | From:
passagemaking-under-power-bounces at lists.samurai.com> > |
[mailto:passagemaking-under-power-bounces at lists.samurai.com] On Behalf Of> > |
Ron Rogers> > | Sent: Saturday, March 15, 2008 1:11 PM> > | To: Passagemaking
Under Power List> > | Subject: Re: [PUP] Emergency tiller> > |> > | Before
excusing the stabilizer fins, try going straight with the fins> > |
"centered." I'll bet she stays on course.> > |> > | Ron Rogers> >
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Passagemaking Under Power and PUP are trademarks of Water World Productions,>
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_______________________________________________>
http://lists.samurai.com/mailman/listinfo/passagemaking-under-power> > To
unsubscribe send email to> passagemaking-under-power-request at lists.samurai.com
with the word> UNSUBSCRIBE and nothing else in the subject or body of the
message.> > Passagemaking Under Power and PUP are trademarks of Water World
Productions,> formerly known as Trawler World Productions.>
_______________________________________________>
http://lists.samurai.com/mailman/listinfo/passagemaking-under-power> > To
unsubscribe send email to> passagemaking-under-power-request at lists.samurai.com
with the word> UNSUBSCRIBE and nothing else in the subject or body of the
message.> > Passagemaking Under Power and PUP are trademarks of Water World
Productions, formerly known as Trawler World Productions.>
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