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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
Photos: Lori Ann
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Posted: Sat Jun 02, 2007 10:12 am Post subject: Jet drive? |
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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 _________________ Doryman
M/V Lori Ann
TomCat 255, Hull #55, 150 Yamahas
Anacortes, WA
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BrentB
Joined: 15 Jul 2006 Posts: 4420 City/Region: Greenwood
State or Province: IN
Photos: BrentB
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Posted: Sat Jun 02, 2007 10:12 pm Post subject: |
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I thought jet drive systems are inefficient esp at slow speeds. _________________ Brent Barrett |
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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
Photos: Sea Wolf
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Posted: Sun Jun 03, 2007 12:49 am Post subject: |
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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. _________________ Sea Wolf, C-Brat #31
Lake Shasta, California
 
"Most of my money I spent on boats and women. The rest I squandered'. " -Annonymous |
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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
Photos: Thataway
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Posted: Sun Jun 03, 2007 12:54 am Post subject: |
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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. _________________ Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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BrentB
Joined: 15 Jul 2006 Posts: 4420 City/Region: Greenwood
State or Province: IN
Photos: BrentB
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Posted: Sun Jun 03, 2007 8:01 pm Post subject: |
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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
Photos: Chivita
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Posted: Mon Jun 04, 2007 12:20 am Post subject: |
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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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