Wayne B wrote:
On Wed, 28 Sep 2011 20:26:54 -0400, Honey Badger
wrote:

On paper they are amazing!
Then you realize that you have to keep a generator running 24/7 to
keep the gyro spinning.

There is a system called an "Anti Roll Tank" that some people have had
success with on pleasure boats in the 40 to 60 ft range. It requires
a custom design unique to each boat however. It usually requires no
power at all, and is effective at slow speeds and at anchor.

http://en.wikipedia.org/wiki/Antiroll_Tanks

For a discussion of all types of stabilization systems, take a look at
the following:

http://en.wikipedia.org/wiki/Ship_stability

The goal is to stabilize a 50' power catamaran at rest in rough seas for
more comfortable fishing and mooring. The anti-roll tanks would
probably add a lot of weight.

-HB

On Thu, 29 Sep 2011 20:14:03 -0400, Honey Badger
wrote:

The goal is to stabilize a 50' power catamaran at rest in rough seas for
more comfortable fishing and mooring. The anti-roll tanks would
probably add a lot of weight.

=========

Anti-roll tanks do add weight but they can be emptied out when not
needed.

Most power cats need very little stabilization compared to a round
bottom displacement hull. That is one of their strong points. It is
impossible to eliminate all motion. What the stabilization systems
are good at is damping down the amplitude of the initial roll and
eliminating recurrence of the "roll back" oscillation. Multi hulls
tend to be self damping and usually have very little roll back motion.

Wayne B wrote:
On Thu, 29 Sep 2011 20:14:03 -0400, Honey Badger
wrote:

The goal is to stabilize a 50' power catamaran at rest in rough seas for
more comfortable fishing and mooring. The anti-roll tanks would
probably add a lot of weight.
=========

Anti-roll tanks do add weight but they can be emptied out when not
needed.

Most power cats need very little stabilization compared to a round
bottom displacement hull. That is one of their strong points. It is
impossible to eliminate all motion. What the stabilization systems
are good at is damping down the amplitude of the initial roll and
eliminating recurrence of the "roll back" oscillation. Multi hulls
tend to be self damping and usually have very little roll back motion.


The vessel has a 22' beam so, at rest, there can be considerable roll
from side-to-side depending on the seas and the wind direction. It is
very comfortable underway.

-HB

On Sat, 01 Oct 2011 21:23:57 -0400, Honey Badger
wrote:

Wayne B wrote:
On Thu, 29 Sep 2011 20:14:03 -0400, Honey Badger
wrote:

The goal is to stabilize a 50' power catamaran at rest in rough seas for
more comfortable fishing and mooring. The anti-roll tanks would
probably add a lot of weight.
=========

Anti-roll tanks do add weight but they can be emptied out when not
needed.

Most power cats need very little stabilization compared to a round
bottom displacement hull. That is one of their strong points. It is
impossible to eliminate all motion. What the stabilization systems
are good at is damping down the amplitude of the initial roll and
eliminating recurrence of the "roll back" oscillation. Multi hulls
tend to be self damping and usually have very little roll back motion.


The vessel has a 22' beam so, at rest, there can be considerable roll
from side-to-side depending on the seas and the wind direction. It is
very comfortable underway.

=================

Commercial fishing boats almost universally use paravanes hung from
outriggers. The outriggers are heavily stressed and require a great
deal of supporting structure. They also increase air draft when
retracted, and not everyone considers them to be aesthetically
appealing.

In article ,
says...

On Sat, 01 Oct 2011 21:23:57 -0400, Honey Badger
wrote:

Wayne B wrote:
On Thu, 29 Sep 2011 20:14:03 -0400, Honey Badger
wrote:

The goal is to stabilize a 50' power catamaran at rest in rough seas for
more comfortable fishing and mooring. The anti-roll tanks would
probably add a lot of weight.
=========

Anti-roll tanks do add weight but they can be emptied out when not
needed.

Most power cats need very little stabilization compared to a round
bottom displacement hull. That is one of their strong points. It is
impossible to eliminate all motion. What the stabilization systems
are good at is damping down the amplitude of the initial roll and
eliminating recurrence of the "roll back" oscillation. Multi hulls
tend to be self damping and usually have very little roll back motion.


The vessel has a 22' beam so, at rest, there can be considerable roll
from side-to-side depending on the seas and the wind direction. It is
very comfortable underway.

=================

Commercial fishing boats almost universally use paravanes hung from
outriggers. The outriggers are heavily stressed and require a great
deal of supporting structure. They also increase air draft when
retracted, and not everyone considers them to be aesthetically
appealing.

Function over form.