Inherently beautiful.
 

Neal really doesn't understand, even though I explained it fully. He'll figure it out and
come up with a creative way to cover his ignorance!

BTW, I get virtually no prop walk - is that because the shaft is horizontal, the blades
are flat, the keel is long, or a combination of all three?


"Shen44" wrote in message
...
From: (Shen44)
Date: 10/22/2003 10:39 Pacific Standard Time
Message-id:

Subject: Inherently beautiful.
From: "Simple Simon"
Date: 10/22/2003 10:07 Pacific Standard Time
Message-id:

Duh! Two fixed props spinning in the same direction
as on Jeff's catamaran will act the same was as one
fixed prop on a monohull.

You sure you're a licensed captain. You just aren't
too bright.

S.Simon


ROFLMAO DUH!!! You STILL don't understand what was being discussed ..... as
stated twice before WAY over your head and experience!!


Shen


Snif? Snif? Smell the beginnings of an electrical overload, as Neal frantically
searches the web, looking for information on twin screw "walking"

Shen

Inherently beautiful.
 

Hey, I'm a sailor. I don't muck around with big,
ugly motorboats if I can help it.

And, yes, I've operated a twin-screw cat bigger
than yours. Have you ever heard of a Corithian?

S.Simon


The Captains Nemesis wrote in message ...
On Wed, 22 Oct 2003 13:07:50 -0400, "Simple Simon"
wrote:

Duh! Two fixed props spinning in the same direction
as on Jeff's catamaran will act the same was as one
fixed prop on a monohull.

You sure you're a licensed captain. You just aren't
too bright.

S.Simon

So you STILL don't understand!

Ever been onboard a twin screwed vessel at any time it was docking?


Oz1...of the 3 twins.
Who spends an hour tuning before every race not just when new sails go on
I welcome you to crackerbox palace,We've been expecting you.

Inherently beautiful.
 

Have you ever heard of a Corithian?

Yes...rich and soft, found in my dad's old Oldsmobile!

RB

Inherently beautiful.
 

ject: Inherently beautiful.
From: "Simple Simon"
Date: 10/22/2003 14:29 Pacific Standard Time
Message-id:

Hey, I'm a sailor. I don't muck around with big,
ugly motorboats if I can help it.


Which is just one of the reasons the discussion was over your head.

Shen

Inherently beautiful.
 

Subject: Inherently beautiful.
From: "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom
Date: 10/22/2003 13:00 Pacific Standard Time
Message-id:

Neal really doesn't understand, even though I explained it fully. He'll
figure it out and
come up with a creative way to cover his ignorance!

BTW, I get virtually no prop walk - is that because the shaft is horizontal,
the blades
are flat, the keel is long, or a combination of all three?


None of the three SHOULD eliminate "prop walk", singly or in combination ....
G you don't have Kort nozzles, do you?
To be sure I'm thinking correctly, both your props are right hand, folding? (I
have no experience with folding, so I don't know if this may be a factor).

When backing, your boat, should want to back to port, as Neal said, once you
lose steerageway .... does it? (assuming two right hand props ... I can't
remember if you said right or left).

Shen

Inherently beautiful.
 

My props are Left-Hand, two blade folding. There is virtually no propwalk. I'm quite
familiar with the phenomenon because my old Nonsuch would walk hard to port, as would all
the single screw boats I've driven.

I was under the impression that a major contributor to prop walk was the angle of the
shaft; thus, if its horizontal, the affect is greatly reduced. If this isn't the case,
what does cause it?

-jeff



"Shen44" wrote in message
...
Subject: Inherently beautiful.
From: "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom
Date: 10/22/2003 13:00 Pacific Standard Time
Message-id:

Neal really doesn't understand, even though I explained it fully. He'll
figure it out and
come up with a creative way to cover his ignorance!

BTW, I get virtually no prop walk - is that because the shaft is horizontal,
the blades
are flat, the keel is long, or a combination of all three?


None of the three SHOULD eliminate "prop walk", singly or in combination ....
G you don't have Kort nozzles, do you?
To be sure I'm thinking correctly, both your props are right hand, folding? (I
have no experience with folding, so I don't know if this may be a factor).

When backing, your boat, should want to back to port, as Neal said, once you
lose steerageway .... does it? (assuming two right hand props ... I can't
remember if you said right or left).

Shen

Inherently beautiful.
 

I believe Shen is wrong here Jeff and you are right. The angle of the shaft
would definitely affect propwalk. It's not the only factor but it will
contribute. I think the biggest villain is pitch and rudder placement as
well as flow and entry/exit of the prop wash.

I think there is less propwalk on folding/ feathering props. I carry a
13"x19# LH 3 bladed prop with a stern hung tiller that is the size of a
small barn door. The prop well unfortunately is small and my upper clearance
is only 4". The keel is 5" thick at the shaft and this affects the flow to
the prop and correspondingly to the rudder in reverse.

Wouldn't it be wise in a twin screw configuration to have counter-rotating
props? This would eliminate propwalk altogether. I was coxswain on a Aux CCG
with a pair of matched outboards and counter-rotating props.... I could
station keep that bugger in the worst conditions with no problems.

CM


"Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message
...
| My props are Left-Hand, two blade folding. There is virtually no
propwalk. I'm quite
| familiar with the phenomenon because my old Nonsuch would walk hard to
port, as would all
| the single screw boats I've driven.
|
| I was under the impression that a major contributor to prop walk was the
angle of the
| shaft; thus, if its horizontal, the affect is greatly reduced. If this
isn't the case,
| what does cause it?
|
| -jeff
|
|
|
| "Shen44" wrote in message
| ...
| Subject: Inherently beautiful.
| From: "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom
| Date: 10/22/2003 13:00 Pacific Standard Time
| Message-id:
|
| Neal really doesn't understand, even though I explained it fully.
He'll
| figure it out and
| come up with a creative way to cover his ignorance!
|
| BTW, I get virtually no prop walk - is that because the shaft is
horizontal,
| the blades
| are flat, the keel is long, or a combination of all three?
|
|
| None of the three SHOULD eliminate "prop walk", singly or in combination
.....
| G you don't have Kort nozzles, do you?
| To be sure I'm thinking correctly, both your props are right hand,
folding? (I
| have no experience with folding, so I don't know if this may be a
factor).
|
| When backing, your boat, should want to back to port, as Neal said, once
you
| lose steerageway .... does it? (assuming two right hand props ... I
can't
| remember if you said right or left).
|
| Shen
|
|

Inherently beautiful.
 

Subject: Inherently beautiful.
From: "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom
Date: 10/22/2003 16:33 Pacific Standard Time
Message-id:

My props are Left-Hand, two blade folding. There is virtually no propwalk.
I'm quite
familiar with the phenomenon because my old Nonsuch would walk hard to port,
as would all
the single screw boats I've driven.

I was under the impression that a major contributor to prop walk was the
angle of the
shaft; thus, if its horizontal, the affect is greatly reduced. If this isn't
the case,
what does cause it?

-jeff


OK, sorry, I thought you said right hand .... your boat should back to stbd
..... does it?
Possibly, your lack of prop walk may have more to do with the two blade
configuration than the direction .... I have always considered two bade props,
"speed props" which have little "bollard pull" on their own, thus, little
"walk" characteristics.
I have heard a number of people say that horizontal shafts tend to have less
prop walk... there may well be some scientific reasoning and proof to this, but
I've seen a number of outboards with a major walk to port (right hand).
To me, the major reason for prop walk, is the pitch of the propellor (more
pitch, more walk) as I feel it's this pitch angle, pulling against the water,
sideways, at whatever angle, which is creating the walk. (G Mooron doesn't
agree .... no problem, he might be correct, technically and in many cases
realistically, but my experience says otherwise).
One question otn asked, that you haven't answered ....when trying to walk, does
your bow go first , or your stern?

I'm inclined to think, your two bladed prop configuration, more than anything,
is the reason, but without actually feeling and handling your boat, it's hard
to tell.

Shen

Inherently beautiful.
 

Inherently beautiful.
From: "Capt. Mooron"


All very interesting ... I may not totally agree with your conclusions, but
there is some well thought out reasoning behind them.

Shen

I believe Shen is wrong here Jeff and you are right. The angle of the shaft
would definitely affect propwalk. It's not the only factor but it will
contribute. I think the biggest villain is pitch and rudder placement as
well as flow and entry/exit of the prop wash.

I think there is less propwalk on folding/ feathering props. I carry a
13"x19# LH 3 bladed prop with a stern hung tiller that is the size of a
small barn door. The prop well unfortunately is small and my upper clearance
is only 4". The keel is 5" thick at the shaft and this affects the flow to
the prop and correspondingly to the rudder in reverse.

Wouldn't it be wise in a twin screw configuration to have counter-rotating
props? This would eliminate propwalk altogether. I was coxswain on a Aux CCG
with a pair of matched outboards and counter-rotating props.... I could
station keep that bugger in the worst conditions with no problems.

CM

Inherently beautiful.
 

I can't agree here, although I've also heard this and there may be some
validity to it. However, most ships I've been on, have very little angle
on their shafts ..... they torque to port like an SOB, more so with
engine speed than not.
There are many reasons/factors which will affect "prop walk", and some
boats will ignore it, if the wind/current is strong enough, but I'm also
inclined to think "pitch" is the major factor, and Jeff's two bladed
props may not have or need much for his application.

BTW Boobsprit, we will occasionally get into a ****ing match with Neal,
since on rare instances he show's some trolling intelligence .... you
are, on the other hand, a total waste of effort, not worth more than one
or two responses on extremely rare occasions, purely to note your idiocy.

otn

Capt. Mooron wrote:
I believe Shen is wrong here Jeff and you are right. The angle of the shaft
would definitely affect propwalk. It's not the only factor but it will
contribute. I think the biggest villain is pitch and rudder placement as
well as flow and entry/exit of the prop wash.

I think there is less propwalk on folding/ feathering props. I carry a
13"x19# LH 3 bladed prop with a stern hung tiller that is the size of a
small barn door. The prop well unfortunately is small and my upper clearance
is only 4". The keel is 5" thick at the shaft and this affects the flow to
the prop and correspondingly to the rudder in reverse.

Wouldn't it be wise in a twin screw configuration to have counter-rotating
props? This would eliminate propwalk altogether. I was coxswain on a Aux CCG
with a pair of matched outboards and counter-rotating props.... I could
station keep that bugger in the worst conditions with no problems.

CM


"Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message
...
| My props are Left-Hand, two blade folding. There is virtually no
propwalk. I'm quite
| familiar with the phenomenon because my old Nonsuch would walk hard to
port, as would all
| the single screw boats I've driven.
|
| I was under the impression that a major contributor to prop walk was the
angle of the
| shaft; thus, if its horizontal, the affect is greatly reduced. If this
isn't the case,
| what does cause it?
|
| -jeff
|
|
|
| "Shen44" wrote in message
| ...
| Subject: Inherently beautiful.
| From: "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom
| Date: 10/22/2003 13:00 Pacific Standard Time
| Message-id:
|
| Neal really doesn't understand, even though I explained it fully.
He'll
| figure it out and
| come up with a creative way to cover his ignorance!
|
| BTW, I get virtually no prop walk - is that because the shaft is
horizontal,
| the blades
| are flat, the keel is long, or a combination of all three?
|
|
| None of the three SHOULD eliminate "prop walk", singly or in combination
....
| G you don't have Kort nozzles, do you?
| To be sure I'm thinking correctly, both your props are right hand,
folding? (I
| have no experience with folding, so I don't know if this may be a
factor).
|
| When backing, your boat, should want to back to port, as Neal said, once
you
| lose steerageway .... does it? (assuming two right hand props ... I
can't
| remember if you said right or left).
|
| Shen
|
|