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Shafts thru the transom? Shafts thru the transom?
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  #16  
Old 10-02-2003, 01:06 AM
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That's the setup of Sonny Miller's drives. They are called CAL500.
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  #17  
Old 10-02-2003, 02:38 AM
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Willallison Willallison is offline
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There are many non-trimmable surface drives available. I think the ones Trouty pictured are Seafury, designed if I recall correctly by Renato Levi.
But the point you made earlier still stands Gonzo - the cost of props alone rules surface drives out if you're after a cheap propulsion system. And to develop one from scratch I would expect to be hellishly expensive....
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  #18  
Old 10-14-2003, 09:17 PM
martiniboat martiniboat is offline
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Hi guys, I'm new to this board, I've chased a thread over from OSO. I must say, it's refreshing to get 'out for a walk', talk with some new people, here different opinions etc.

This thread is very interesting because I have a 30' Corsa hull that needs complete refurbishing and was tossing around the idea of building a surface drive system for it. Carry on fellas...

Sincerely,
Brian Kamrath
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  #19  
Old 10-14-2003, 11:42 PM
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Willallison Willallison is offline
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OSO ?....
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  #20  
Old 10-15-2003, 12:15 AM
martiniboat martiniboat is offline
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Oh sorry, OSO= Offshore Only

Brian Kamrath
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  #21  
Old 10-15-2003, 04:58 AM
L.DOSSO L.DOSSO is offline
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beautiful boat!
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  #22  
Old 10-15-2003, 09:51 AM
martiniboat martiniboat is offline
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Thanks! It was said to have a Kevlar layup. The beam is 7' so when finished should be a really quick ride. My 25' Martini is also 7' wide ( measured at the widest part) 6' at the wetted area of the transom. It knifes through waves quite easily. Ooops, I'm rambling on someone else's thread!, back to work I go!

Brian
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  #23  
Old 10-22-2003, 08:36 PM
CaptPPan CaptPPan is offline
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My boat is set up just the way your asking, a straightshaft through the transom and a surface prop and rudder. There are some issues setting it up. The distance betweenthe coupling and the cutlas bearing will probably be long, so you will have to use a larger shaft diameter to eliminate vibration, the stuffing box will be out of the water when on a plain so you'll have to use a dripless, or supply the packing with water to cool it (an easy fix) I am running a Elis elephant ear 3 blade prop behind a 330hp engine giving my 27' a crusing speed of aprox 30knots at 3000rpm.
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  #24  
Old 10-22-2003, 08:54 PM
CaptPPan CaptPPan is offline
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Buck I applaud your thinking "outside the box" I am a great believer in alturnitive drive systems and surface peircing is the way to go for speed and economy.

Take a look at Symplicity Drive it's a symple bolt on application.

By the way what type of vessel are you thinking of? Lenght , HP, and useage?
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  #25  
Old 10-23-2003, 08:43 AM
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How about getting up on plane compared to an outdrive? Less than thirty knots is not better than what an outdrive will get.
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  #26  
Old 10-23-2003, 10:47 PM
CaptPPan CaptPPan is offline
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The only thing different about getting up on a plane with my boat is the engine rpms jump for a few seconds (5 -10) as the prop transitions from fully submerged to surfacing piercing. But she comes ot of the hole as fast as my other boats.

I'm getting a better then 30k at 3000 RPM cruise with the same prop I had with the tired 260hp engine. I need to reprop and I'm sure I'll pick up at least 5 knots now that I've got the new 330hp engine. The $800.- $900.. just was'nt in the budget this year.
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  #27  
Old 10-24-2003, 09:48 AM
Buck Buck is offline
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CaptPPan' where can I see the Symplicity Drive.
Thanks for the info
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  #28  
Old 10-24-2003, 11:58 AM
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What was the speed with the tired 260 HP?
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  #29  
Old 10-24-2003, 06:02 PM
CaptPPan CaptPPan is offline
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The speed was about the same at 3000RPM, I don't like to push my motors much above that. I figure with the bigger engine I can push a bigger prop, jmore speed same RPM. She tops out now at around 42knots.


http://www.simplicity-marine.com/smd1.htm
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  #30  
Old 10-30-2003, 05:15 PM
CaptPPan CaptPPan is offline
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Looks like this
More Pictures on "pourposing" thred
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