Fascinating new drive system from Volvo
 

Yeah, and at over 40 knots!

http://groups.msn.com/FishWishersHomePage
(Formerly MowerKing)

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.

Leading with the prop?

That should work well in the log infested waters up this way. (not).

I assume that Tiara will offer this as an available upcharged option, not as
standard equipment?

Every so often, somebody tries to reinvent the wheel.

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.

--
--
Karl Denninger ) Internet Consultant & Kids Rights Activist
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"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?



--
--
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

"Harry Krause" wrote in message
...
WaIIy wrote:

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


Tiara is going to use it.



Forward facing props unprotected by any sort of skeg, with the units
coming out through a hole in the bottom of the boat?

Fascinating!

You didn't finish reading Harry.

Eisboch

"Harry Krause" wrote in message
...
Eisboch wrote:
"Harry Krause" wrote in message
...

WaIIy wrote:

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


Tiara is going to use it.



Forward facing props unprotected by any sort of skeg, with the units
coming out through a hole in the bottom of the boat?

Fascinating!


You didn't finish reading Harry.

Eisboch



Yeah, I did. I wouldn't own an inboard with a rear-facing wheel unless
it were at least partially protected by a keel and skeg. The new Volvo
unit is totally unprotected. And I wouldn't want to depend upon the unit
simply breaking off under the hull without it creating a huge hole in
the bottom of the boat.

No more risk than a shaft, cutlass bearing mount, prop and rudder on a true
inboard without a keel. I saw a 43' Post that hit a rock going through
Wood's Hole last summer. It had a 1' by 2' hole in the bottom where the
port shaft went through the hull. Both shafts looked like bananas and the
props were, well they weren't anymore.

From what I read about the new Volvo drive, it has a pre-engineered break
point that will not result in a swamped boat.

Eisboch

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

Biggest problem? Forget the possible damage stuff .... for those with twin
screw experience, you'll have to forget everything you learned, be they
inboards or I/O's, and learn a whole new way of boat handling..... and for
many, it will be impossible.

Shen

"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.