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Old 13 October 2010, 10:13   #1
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Whale Tail XL!

Hi all, this is a subject that has probably been discussed before in relation to dole fins and the like.. But saw an ad there recently in 'ribmagazine' for a 'whale tail xl' .. It bolts onto the cavitation plate... Supposed to increase speed, decrease fuel consumption.. Was lookin at it on their website and it's 60 dollars or thereabouts! Has anyone got one installed? Or does anyone know are there any reports about it/advantages/disadvantages??
Thanks all..
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Old 13 October 2010, 10:22   #2
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been discussed quite a bit on here...

http://rib.net/forum/showthread.php?...light=doelfins
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Old 13 October 2010, 10:31   #3
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Ah lovely I'll have a read! Just wondering is there a difference between dole fons and that whale tail or are the effectively the same thing? They look a little different...
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Old 13 October 2010, 10:50   #4
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Ah lovely I'll have a read! Just wondering is there a difference between dole fons and that whale tail or are the effectively the same thing? They look a little different...
They are all fundamentally the same I think.
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Old 13 October 2010, 11:18   #5
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If I was to replace mine, I'd go for one of these (all aluminum, and seemingly much stronger than the plastic ones):

http://www.permatrims.com/


Currently, I have one of these guys which came with the build (so I have no idea if it makes a difference or not):

http://www.sesport.com/5_29.asp


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Old 13 October 2010, 14:12   #6
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Thanks guys... Those Permatrim fins look pretty good alright... Still a little nervous about drilling the cav plate but hey, what's the worst that could happen( don't answer that!! ) :-)
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Old 13 October 2010, 16:48   #7
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what's the worst that could happen( don't answer that!! ) :-)
I think it goes something like Brrrrrrrmmmmmmmcracksplash<silence>
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Old 14 October 2010, 05:37   #8
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There be a time & a place for these things, but with a 90 on a (guess) 5.5- 6 M boat you shouldn't have any lift problems. Any lift you get at speed will be nicely countered by the drag, which will increase the bigger the fins are.

My boat had a set (not the ones you are talking about) on when I got it. They had bent up with use, so I have to ask just how much lift they were actually giving when shown some movement though the water...... If they were permanently bent up at 10 degrees (ish) out the water they must have gone a lot further "in action".

Ironically, the boat then handled fine without them.
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Old 14 October 2010, 06:53   #9
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There be a time & a place for these things, but with a 90 on a (guess) 5.5- 6 M boat you shouldn't have any lift problems. Any lift you get at speed will be nicely countered by the drag, which will increase the bigger the fins are.

My boat had a set (not the ones you are talking about) on when I got it. They had bent up with use, so I have to ask just how much lift they were actually giving when shown some movement though the water...... If they were permanently bent up at 10 degrees (ish) out the water they must have gone a lot further "in action".

Ironically, the boat then handled fine without them.
Yeah I see your point there alright, I reckon the new boat should handle just fine without them.. I haven't even got it yet and already I'm looking at gadgets!!  ...I had a set of dole fins on a Shetland of mine about 10 years ago and they were horendous.. If I did decide to go for them though the whale fin seems to be one of the better finished sets...I think tough for the standard boat with 2 or 3 up it should be perfect as it stands!!
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Old 14 October 2010, 10:55   #10
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...I had a set of dole fins on a Shetland of mine about 10 years ago and they were horendous.. If I did decide to go for them though the whale fin seems to be one of the better finished sets...I think tough for the standard boat with 2 or 3 up it should be perfect as it stands!!
You rarely see them fitted to modern RIBs.
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