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The Norfolk Broads Forum / General Chat / Finished new boat a took down river.
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Posted By Discussion Topic: Finished new boat a took down river.

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norm
May-18-2009 @ 6:56 PM                           Permalink
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Learning The Ropes
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Hello everyone, back on the broads with new boat, 11 months later with a full referb' took the frog down the river for the first time saturday evening it was like having a new toy, it was very exciting. We went from woodsdyke to ranworth and back again, then to the new inn; horning and back the our birth. Everything is working ok now but there were a few problems with the hydrolic, very minor. Not sure if i have to change the prop' there isnt a good response when putting into reverse, or is it just the boat. Oh that could be exciting! The handle on the boat is abit different to my old aquafibre 38 - kingfisher blue. Cannot wait until can get on the water again in the bank holiday.

If anyone has any advice on the prop size aquired for the 39ft carribiean. Please get back to me.

Havvve you seeen the frog? Tinhat

Dibbler
May-18-2009 @ 7:26 PM                           Permalink
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Norm, there will always be some cavatation (unsure of spelling Blush  ) in reverse so I suspect the boat's reluctance is quite normal.

We once spoke with some hirers on a Carribean and they said she was an absolute pig in reverse...virtually having a mind of her own. The hirers weren't newbies either, they were regular boaters.

John

norm
May-18-2009 @ 8:30 PM                           Permalink
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Learning The Ropes
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thanks dibbler for reply.going to find out right prop size.had lots of boats but this feels like starting allover again with this flat bottom boat.

haaave you seen the frog


Smile  Smile

PeteSanders
May-18-2009 @ 9:48 PM                           Permalink
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Propeller selection is far from an exact science, and you really need to
take some expert advice before embarking on what could be a very
expensive experimental session, unless of course you already have the
relevant experience, though the fact that you're asking for "the prop
size for a 39ft Caribbean" would suggest not.

There are many variables to propeller selection including, but not
limited to, hull design, weight, engine power & reduction ratio, & max
possible prop diameter,and that lot just relates to the boat.  For the
propeller itself, then there's diameter and pitch, but also number of
blades, blade area ratio, blade shape, and direction of rotation or
handing.  You'll also need to know shaft diameter and taper and
keyway.  As you can now see, this may not be a simple, "off the shelf"
selection, and in many cases props have to be cast to order.

Before saying any more about any of the above, I have to ask if you've
made some fundamental change to your drive-train, such as new
engine, pump, motor or any combination of these items leading you to
believe that the boat now has the incorrect propeller fitted?  Out of
interest do you know what size and type prop you have fitted now?

If after considering all the above, you really feel that you have the
wrong prop fitted, then to save some money I'd be taking advice from a
reputable boatyard.

Pete


Maurice_Mynah
May-18-2009 @ 10:20 PM                           Permalink
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You may try looking into getting a rudder with a little more area, this would be a cheaper option over a larger prop. Equally it’s possible I have totally misunderstood what the symptoms of the problem are.  


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