On Oct 1, 10:34*pm, "Roger Long" wrote:
Sea trials of the Maryland research vessel are going well. We saw 24 knots
briefly but she'll probably never go that fast again as there is still one
more large winch to go on. *Hard over full speed turns are just right with a
bit of roll in.

Click the new picture on my web site (second one down):

http://home.maine.rr.com/rlma

to get to a page of videos and pictures that will be updated frequently.

There is also a video of maximum acceleration at:

http://home.maine.rr.com/rlma/Running.wmv

These speeds are in fairly shallow water but that will be typical of her
operating area.

--


Pretty good, I didn't think that jet drives could get off the dime
like that.

Does the boat have a conventional rudder or steering only with the
jets?

Fresh Breezes- Doug King

No rudders. The jets are arranged so that neutral thrust can be produced
when the engines are in gear by directing water equally fore and aft. The
engines are put in gear as soon as it's time to move the boat and don't go
into neutral until stopped. There is reverse but it is just for clearing
debris.

--
Roger Long

On Thu, 2 Oct 2008 22:48:23 -0400, "Roger Long"
wrote:

No rudders. The jets are arranged so that neutral thrust can be produced
when the engines are in gear by directing water equally fore and aft. The
engines are put in gear as soon as it's time to move the boat and don't go
into neutral until stopped. There is reverse but it is just for clearing
debris.

I wasn't sure what a Carden shaft was till I looked it up. Our fifty
year old jet drive runabout has one. And no gearbox. Water deflector
for neutral and reverse.

Casady