On Thu, 16 Dec 2004 07:00:46 -0500, Dave Hall
wrote:

On Wed, 15 Dec 2004 17:02:27 -0500, "Eisboch"
wrote:


"S. N. Ot" wrote in message
news

"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?



So, what happens when you hit a rock or log at 25 knots with an Alpha or
Bravo drive?

The drive and trim rams are designed to "give" backward to absorb much
of the shock. At slower speeds, you might get away with only prop and
skeg damage. Higher speeds have been known to punch a hole into the
nose cone. I also had a friend who had an unfortunate encounter with a
rock at high speed and it pretty much sheared the drive off at the
gimbal mount. In this particular case, water started to seep in
through what used to be the shaft bellows, but it was not enough that
the bilge pump couldn't keep up until we towed him in

But without that built-in "give", something WILL break.

Even with the give, something will break.

Later,

Tom

In article ,
Shen44 wrote:


Subject: Fascinating new drive system from Volvo
From: WaIIy
Date: 12/14/2004 9:56 PM Pacific Standard Time
Message-id:

On 15 Dec 2004 03:37:39 GMT, (Shen44) wrote:

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

Good point, it's something new, so it will be impossible to learn.

Duh



BG First off, in reading over the "press release", I'm not sure that this
unit is set up as I first thought. (360* azimuthing).
If, however, it is, then there will be a big learning curve, which some will
never master.
On Z-drives, those who have the greatest problems are generally those who have
a long history of standard twin screw, since you have to throw out everything
you learned, make sure you forget it and learn a totally new system which for
many, never becomes "second nature".

Shen

You can drive this as a standard twin-screw boat around the docks. Leave
the wheel centered and use differential thrust with the gears. My
understanding is that the system does not interfere with 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