Boats and motorcycles
 

Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch

Boats and motorcycles
 

"RCE" wrote in message
...
Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch


To which side is the captain leaning? 8)

Boats and motorcycles
 

"RCE" wrote in message
...
Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch


It depend whether or not JohnH be at the helm.

Boats and motorcycles
 

"JimH" wrote in message
...

"RCE" wrote in message
...
Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch


It depend whether or not JohnH be at the helm.


Oops..........*will* be at the helm. ;-)

Boats and motorcycles
 

On Fri, 1 Jun 2007 17:48:43 -0400, "RCE" wrote:

Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch


left

Boats and motorcycles
 

On Fri, 1 Jun 2007 18:39:24 -0400, "D.Duck" wrote:


"RCE" wrote in message
...
Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch


To which side is the captain leaning? 8)


Duck, here is some info on 'countersteering' from Wikipedia.

"Lean by countersteering

When riding a bicycle or a motorcycle, countersteering is a method of
initiating a turn by a small, momentary turn of the front wheel, usually
via the handlebars, in the opposite (counter) direction. Like the book
example above, this moves the pivot point (the wheels' contact patches) out
from under the center of mass to establish the lean angle for a turn. While
necessary at all speeds, the need to countersteer becomes more noticeable
as speed increases.

Hence, if a rider wants to turn to the right, he first throws the bike off
balance by momentarily pointing the front wheel slightly to the left. The
center of mass of the bike plus rider will continue in a straight line, but
the contact patches of the tires move to the left with respect to this
straight line."

Note, it applies to motorcycles and bicycles.

Boats and motorcycles
 

On Jun 1, 4:48?pm, "RCE" wrote:
Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch

Depends on how long the boat is.

May not go anywhere considering engines are at idle

Boats and motorcycles
 

"Tim" wrote in message
oups.com...
On Jun 1, 4:48?pm, "RCE" wrote:
Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch

Depends on how long the boat is.

May not go anywhere considering engines are at idle


Oh, it will move.

I posed the question poorly. Better questions a

Which way will the bow move?
Which way will the stern move?

Eisboch

Boats and motorcycles
 

On Jun 1, 7:06?pm, "RCE" wrote:
"Tim" wrote in message

oups.com...





On Jun 1, 4:48?pm, "RCE" wrote:
Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch

Depends on how long the boat is.

May not go anywhere considering engines are at idle

Oh, it will move.

I posed the question poorly. Better questions a

Which way will the bow move?
Which way will the stern move?

Eisboch- Hide quoted text -

- Show quoted text -

OK, well then, I must have posted my answer poorly. If it's moored
bow first in a slip it probably won't go anywhere

Boats and motorcycles
 

"RCE" wrote in message
...

"Tim" wrote in message
oups.com...
On Jun 1, 4:48?pm, "RCE" wrote:
Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation.

Twin screw inboard.
No wind.
Little or no current.

Helm hard over to port.
Starboard engine at idle
Starboard transmission in "forward".

Port engine at idle
Port transmission in "reverse".

Which way will the boat move?

Eisboch

Depends on how long the boat is.

May not go anywhere considering engines are at idle


Oh, it will move.

I posed the question poorly. Better questions a

Which way will the bow move?
Which way will the stern move?

Eisboch


With the rudder in the neutral position the boat would pivot to port.

With the rudder hard port one may think the boat may tend to move even more
aggressively (bow) to port.........but the correct answer will probably be
the bow moving to starboard. ;-)