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Jet drive?

 
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Doryman



Joined: 03 Oct 2006
Posts: 3807
City/Region: Anacortes
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: Lori Ann
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PostPosted: Sat Jun 02, 2007 10:12 am    Post subject: Jet drive? Reply with quote

It just occurred to me that I have never heard of a C-Dory fitted with a jet drive outboard. Given the shallow draft, etc. wouldn't a 16 or 22 make a good river boat? Maybe not quite a sled, and certainly heavier than an open aluminum boat, but it could offer other advantages. Or not.

Warren

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BrentB



Joined: 15 Jul 2006
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PostPosted: Sat Jun 02, 2007 10:12 pm    Post subject: Reply with quote

I thought jet drive systems are inefficient esp at slow speeds.
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Sea Wolf



Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
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PostPosted: Sun Jun 03, 2007 12:49 am    Post subject: Reply with quote

Brent wrote:
I thought jet drive systems are inefficient esp at slow speeds.


Brent-

They are inefficient at all speeds, wasting about 25% of the H.P. in internal friction of the jet pump.

Plus they are very hard to steer at low speeds, have poor reverse thrust (diverted), and only have steering when you have the motor applying thrust: no thrust = no steering.

Their advantage, though, lies in shallow water use where they require less depth than a prop drive.

Contrary to popular myth, they are not invulnerable to problems picking up gravel, and damage and wear do occur when passing larger particles through them.

River Horse, of course, was a CD-22 Classic, and made it through from the Mississippi river system to the Pacific Coast, if I remember right.
I don't remember, though, if they used a jet drive. Anyone remember?

No doubt, the CD-22 would make a great camping boater-home on the river, as we've already noted many times.

One more thought- the fiberglass cored hull of the C-Dory is very tough, but not a match for a 1/4" thick aluminum alloy river sled for taking on bolders at speed. The aluminum bends, dents, and gets scraped up, but will not suffer major cracking like fiberglass on a severe impact.

Joe.

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thataway



Joined: 02 Nov 2003
Posts: 21357
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
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PostPosted: Sun Jun 03, 2007 12:54 am    Post subject: Reply with quote

River Horse had a conventional outboard (My copy with with C Pelican, but I am quite sure of this--there were props which were bent and hammered out.)

There are some rivers where the jets are used--but also conventional outboards are used on fast rivers also.

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BrentB



Joined: 15 Jul 2006
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PostPosted: Sun Jun 03, 2007 8:01 pm    Post subject: Reply with quote

thanks Joe, Warren, Bob

River-Horse used twin 45hp Honda 4 stroke motors.

Joe after the Links forum is started, start a glossary, I am always looking up nautical words used by Bob
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Chivita



Joined: 04 Nov 2003
Posts: 218
City/Region: Hansville
State or Province: WA
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: Chivita
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PostPosted: Mon Jun 04, 2007 12:20 am    Post subject: Reply with quote

I doubt you would want to use a Jet Drive/C-Dory combo on a river, unless you're an ace at fiberglass hull repair. The ticket for shallow river running is an alumunum hull/Jet drive combo. Attached to the hull are replaceable nylon "skids". Although you can go up river somewhat slowly, going down stream takes tremendous coordination and a serious ability to both remember where the hard pointy parts were and the ablity to read the water instantly as you have to go like a "bat out of hell" to maintain steerage.

To ride with someone who has all of the above is pure joy mixed with extreme terror! To ride with someone lacking the above takes seatbelts, helmets and hiking boots, cause someone's going to have to hike out for help, and that person should not be the one that just took out the windshield.
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