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Shafts thru the transom? Shafts thru the transom?
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  #31  
Old 11-10-2003, 08:31 PM
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Perhaps taking a look at Surface and Subsurface Drive all in one
may add to the confusion.Tom Kane
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  #32  
Old 11-11-2003, 09:23 AM
Buck Buck is offline
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Does such an animal exist?
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  #33  
Old 11-11-2003, 05:25 PM
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If it does, I for one would be very interested to see how it works....
Surface drives - or more accurately, their props - rely on being able to cavitate. As soon as you submerge them completely, they are unable to do so and tend to overload the engines. So I can't see how you'd produce a drive capable of both modes of operation.
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  #34  
Old 12-02-2003, 07:41 PM
CaptPPan CaptPPan is offline
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Looks like this
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  #35  
Old 12-02-2003, 10:22 PM
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That's a regular propeller. Are you saying it runs as a cavitating propeller?
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  #36  
Old 12-02-2003, 11:01 PM
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I am watching with interest and reading about.
The Patent Cooperation Treaty. Tom kane
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  #37  
Old 12-02-2003, 11:11 PM
martiniboat martiniboat is offline
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Tom, what's the PCT all about? Just curious.

Brian Kamrath
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Cool, another boating forum.
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  #38  
Old 12-03-2003, 02:06 AM
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Hi Brian, If you want to apply for a patent in a large number of
countries one method is to make an application under the Patent
Cooperation Treaty.This can simplify the process of seeking a
patent in countries which are party to the PCT.Under that system
you can make a single international application to cover as many
countries that interest you..and so on.cheaper, other advantages.
Tom kane.
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  #39  
Old 12-03-2003, 06:37 AM
martiniboat martiniboat is offline
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Cool, thanks Tom!

Brian
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  #40  
Old 12-03-2003, 07:26 AM
CaptPPan CaptPPan is offline
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It's an Ellis made in Florida, I think they call it an elephant ear. Yes it runs as a ventalated propeler, half out of the water. When I win the lottery I'll buy a Rolla.
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  #41  
Old 12-06-2003, 06:32 PM
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Thank you captppan.I believe I understand what you are saying.
Looks more practical than many more expensive drives.tom kane.
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  #42  
Old 12-06-2003, 11:51 PM
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captppann: do you have performance data? I think without comparisons we can't really tell if it is a good or just a cool looking setup.
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  #43  
Old 12-07-2003, 07:44 PM
CaptPPan CaptPPan is offline
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Unfortuately mine is a one of a kind boat so there are no easy comparisons with different drive systems.(except for a few made that are powered by outboards)

I'm also not proped correctly yet so the numbers I have are far from optimum. At 3000 rpm she'll do just over 30knots now depending on load. That's with a single 330hp crusader.
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  #44  
Old 12-08-2003, 01:10 AM
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Looking at your picture, if the propeller runs ventilated, the rudder is clear out of the water. How do you steer?
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  #45  
Old 12-08-2003, 08:42 PM
CaptPPan CaptPPan is offline
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I guess theres just enought in the water to steer. She handles fine at speed and wonderful at idle. Backing up is another story.
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