On Wed, 15 Dec 2004 04:04:15 GMT, "Calif Bill"
wrote:


"Gary" wrote in message
...


Very interesting.

I'm not sure I believe this part:

In the high-speed scenario, the leg and pod will shear off flush with the
hull. The lower bearing carrier has been engineered specially to break at
a
point below the O-ring seal between the fixed and steerable parts of the
drive. As the leg bends backwards, the vertical drive shaft simply pulls
out
of its spline. The inside of the transmission is now open to the ocean but
no water can escape into the boat and the vital mounting joint between
transmission and hull will remain not only intact but undamaged thanks to
the energy absorption of the big twin O-rings.

And hearing how much parts for Volvo's cost, this should result in an
undamaged hull, but a really damaged checking account.

And, like most things that have Volvo stamped on them, incredible and
astronomic repair bills because the damn things are over engineered.

Later,

Tom

On Wed, 15 Dec 2004 06:40:23 -0500, Harry Krause
wrote:

Short Wave Sportfishing wrote:
On Wed, 15 Dec 2004 04:04:15 GMT, "Calif Bill"
wrote:


"Gary" wrote in message
...


Very interesting.

I'm not sure I believe this part:

In the high-speed scenario, the leg and pod will shear off flush with the
hull. The lower bearing carrier has been engineered specially to break at

a

point below the O-ring seal between the fixed and steerable parts of the
drive. As the leg bends backwards, the vertical drive shaft simply pulls

out

of its spline. The inside of the transmission is now open to the ocean but
no water can escape into the boat and the vital mounting joint between
transmission and hull will remain not only intact but undamaged thanks to
the energy absorption of the big twin O-rings.

And hearing how much parts for Volvo's cost, this should result in an
undamaged hull, but a really damaged checking account.

And, like most things that have Volvo stamped on them, incredible and
astronomic repair bills because the damn things are over engineered.

More impressive would have been an outdrive that tips completely out of
the water.

ROTFL!!!

Exactly - something actually useful. :)

Later,

Tom

On Tue, 14 Dec 2004 15:44:55 -0500, Harry Krause
wrote:

Karl Denninger wrote:
In article , WaIIy To wrote:

http://www.ybw.com/auto/newsdesk/200...42mbynews.html


Tiara is going to use it.


Forward facing propellors with no protection eh?

That ought to be interesting the first time you hit something solid at 40
knots.

Oh yeah, I read the part about the leg shearing off and not puncturing the
hull. Uh huh. And if that seal fails? Exactly how big is that mounting
hole? Bet 'ya can't jam a wooden plug in THAT slot.

--


Damn, Karl...I know this will make you nervous, but we're in total
agreement on this.

Don't take any drastic measures!

Here's another one for ya'. I'm also in total agreement. The whole
concept, despite their attempts at designing for minimum damage, seems
to be a recipe for a sunk boat.

Dave

On Tue, 14 Dec 2004 16:40:29 GMT, WaIIy
wrote:



http://www.ybw.com/auto/newsdesk/200...42mbynews.html


Tiara is going to use it.


While I applaud any advances in technology as applied to marine
propulsion, I see a few points that really bother me.

1. Despite the review's attempt to sell this as equivalent in
simplicity and maintenance as a straight shaft drive, it has far more
parts, and more closely resembles an outdrive than a straight shaft
drive.

2. Unprotected props pulling the boat? Again they attempt to put the
reader at ease when the obvious question of striking an underwater
object comes up. But I doubt that there are any guarantees. If that
drive sheers backward at 40 MPH, what's to stop it from punching a
hole in the hull directly behind the mount? Even if the drive sheers
off as designed, it's not going to be a cheap fix.

Dave

In article t,
otnmbrd wrote:


System is being used on many large cruise ships (well, similar) it's
called azipods. as for protection .... hey add some kort nozzles.

There's a HUGE difference between how its done on a cruise ship and this....
--
--
Karl Denninger ) Internet Consultant & Kids Rights Activist
http://www.denninger.net My home on the net - links to everything I do!
http://scubaforum.org Your UNCENSORED place to talk about DIVING!
http://www.spamcuda.net SPAM FREE mailboxes - FREE FOR A LIMITED TIME!
http://genesis3.blogspot.com Musings Of A Sentient Mind

In article ,
Dave Hall wrote:


On Tue, 14 Dec 2004 15:44:55 -0500, Harry Krause
wrote:

Karl Denninger wrote:
In article , WaIIy To wrote:

http://www.ybw.com/auto/newsdesk/200...42mbynews.html


Tiara is going to use it.


Forward facing propellors with no protection eh?

That ought to be interesting the first time you hit something solid at 40
knots.

Oh yeah, I read the part about the leg shearing off and not puncturing the
hull. Uh huh. And if that seal fails? Exactly how big is that mounting
hole? Bet 'ya can't jam a wooden plug in THAT slot.

--


Damn, Karl...I know this will make you nervous, but we're in total
agreement on this.

Don't take any drastic measures!

Here's another one for ya'. I'm also in total agreement. The whole
concept, despite their attempts at designing for minimum damage, seems
to be a recipe for a sunk boat.

Dave

It'll be interesting to watch how this one plays out.

Until a few people run over a manatee with one (heh heh), or hit something
offshore, I'm not sold.

I've not managed to rip a screw off my boat or do significant damage, but I
have had some dings to the props over the last few years. You do your
damndest to avoid it, but it DOES happen.

Second, exactly how expensive is damage to that underwater unit if/when it
happens? What will one of those units plus whatever is trashed on the
mounting ring cost to replace?

Finally, I'm not sold on the wisdom of engines under the cockpit sole. I
know its a popular setup (V-drives and all), but it tends to make trim a bit
interesting with all that mass aft. And given recent trends, I'm more than
a bit concerned about service access.

--
--
Karl Denninger ) Internet Consultant & Kids Rights Activist
http://www.denninger.net My home on the net - links to everything I do!
http://scubaforum.org Your UNCENSORED place to talk about DIVING!
http://www.spamcuda.net SPAM FREE mailboxes - FREE FOR A LIMITED TIME!
http://genesis3.blogspot.com Musings Of A Sentient Mind

In article ,
P.Fritz wrote:



"Karl Denninger" wrote in message
news:dfIvd.5060$jn.4591@lakeread06...

In article , WaIIy To
wrote:

http://www.ybw.com/auto/newsdesk/200...42mbynews.html


Tiara is going to use it.

Forward facing propellors with no protection eh?

That ought to be interesting the first time you hit something solid at 40
knots.

Oh yeah, I read the part about the leg shearing off and not puncturing the
hull. Uh huh. And if that seal fails? Exactly how big is that mounting
hole? Bet 'ya can't jam a wooden plug in THAT slot.

Wouldn't it also throw debris upward into the hull as well if it caught the
upward spin of the prop?

That'd be delicious.

Your leg shears off cleanly, but the drive unit flips upward and punctures
the hull on the way off.

--
--
Karl Denninger ) Internet Consultant & Kids Rights Activist
http://www.denninger.net My home on the net - links to everything I do!
http://scubaforum.org Your UNCENSORED place to talk about DIVING!
http://www.spamcuda.net SPAM FREE mailboxes - FREE FOR A LIMITED TIME!
http://genesis3.blogspot.com Musings Of A Sentient Mind

My first thought when I saw this was, "Why is the engine so far behind
the outdrive and why is the skeg slanted backward??" Then I realized
that the prop was facing forward!! This sounds like something Ed
Faegol might have dreamed up......

Karl Denninger wrote:
In article t,
otnmbrd wrote:


System is being used on many large cruise ships (well, similar) it's
called azipods. as for protection .... hey add some kort nozzles.


There's a HUGE difference between how its done on a cruise ship and this....
--

I don't know that I'd call it a "huge" difference. Unless I mis read,
it's a pod unit which pivots 360 deg and is normally set up to pull
rather than push. Biggest difference I see is that most azipod units on
ships that I know of, have the motor in the pod.

otn

"WaIIy" wrote in message
...

http://www.ybw.com/auto/newsdesk/200...42mbynews.html

Tiara is going to use it.

This is going to be a nightmare. Look at the schematic and
read what will happen to the drive under impact.

Yeah - I really want the drive unit to break off and sit
on the bottom.

Are you sure it's not April 1st over in Sweden?