33430Re: [bolger] Re: engines
- Jan 4, 2004Dave I have to confess that I don't know a hoot about motor boats, having been a sailor for many years. I assume reverse is often used at moderate speeds to slow or stop a motor boat. Reverse never worked on my sailboat on account of the boat being 8000lbs and the 8hp engine having only a 6" prop. When I hit reverse at 6 knts it took several hundred feet to stop the boat. I don't ever want that arrangement again.
dkb715 <lburright@...> wrote:Don,
Reverse is not very efficient. Again, I think it's because
the "bucket" on outboards isn't very large. (The bucket is the
piece that moves up over the jet to re-direct the water back to the
sides.) I don't use reverse very much for this reason. If I need
to hold myself in a current, I face into it. The other use is
docking which isn't good.j
I don't mean to sound too negative. I love the jet for running in
the rivers. I can definitely go where others can't, and that's what
it's for. For slow speed manuevering, it's not worth a hoot.
--- In firstname.lastname@example.org, Don Tyson wrote:
> Dave B, How is reverse on your 19' Sled? Do you use reverse much
> dkb715 wrote:
> I have a Yamaha 115 HP 4 stroke outboard with a jet that I have
> mounted on a 19' sled I finished about 2 1/2 years ago. The boat
> has a modified V hull. Some of the other replies were right in
> you lose about 25 - 30% of your power with the jet. You don't want
> the water intake hanging down significantly below the back of the
> transom (mine is pretty much even with it). The whole idea behind
> the jet is to allow you to travel in shallow water. It would also
> produce a lot of drag.
> The jet is also a real pig at slow speeds. Maneuverability is a
> major challenge, especially when docking. The inboard jets seem to
> be much better because they have a bigger bucket.
> Dave B
> --- In email@example.com, "tysond99" wrote:
> > Happy Hollidays,
> > I wonder if anyone in this group has experience with outboard
> > jet drives. I have talked to designers who say that it is hard
> > make an inboard/jet drive work smoothly because alot of air
> > (bubbles) are trapped under the hull and consequently fed to the
> > pump with a poor result in propulsion. I wonder if outboard jets
> > would work better since they can be adjusted for depth
> > of the hull.
> > On the Upper Delaware River where I live I see Carolina skiffs
> > going though 6" deep water at 20-30 MPH with 100/+- HP engines
> > their transoms. Imagine how nice this might work on some of the
> > sharpie boats.
> > Don
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- no cursing, flaming, trolling, spamming, or flogging dead horses
- stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
- Pls add your comments at the TOP, SIGN your posts, and snip away
- Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax: (978) 282-1349
- Unsubscribe: firstname.lastname@example.org
- Open discussion: email@example.com
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