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Old 14 April 2011, 12:45   #1
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whats those pokey down bits

sorry for the picture, see the skeg like things on this avon?? WHat are they and anyone any experience in their pro/cons
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Old 14 April 2011, 13:16   #2
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I have always called them gullwings, they make the boat very stable and easy to control at low speeds and also makes the boat plain at lower speeds, they also make for quite a hard ride at speed.
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Old 14 April 2011, 14:05   #3
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sorry for the picture, see the skeg like things on this avon?? WHat are they and anyone any experience in their pro/cons
A quick search for "doelfins" should bring up what your looking for.

Some (nearly all american) small boat owners swear by them. A few say that they find them positively dangerous on boats at 20knts+ but they undoubtably help with low speed planing by creating more stern lift. I am very surprised at that Avon having them, the engine looks a little too large to have them fitted, I thought that they were only fitted up to ~135hp because above they they are definitely unsafe because they cause the boat to be flighty and unstable in turns.

Like I said though, a quick search for "doelfins" will bring up all viewpoints
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Old 14 April 2011, 14:11   #4
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A quick search for "doelfins" should bring up what your looking for.
Eh, but I don't think he's talking about dolefins or other protusions on the antiventillation plate... (can't see in the pic - but don't seem obvious). I think he is referring to the shape of the hull - and the kind of "longitudinal steps" or "exagerated spray rail" type bits or the hull.
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Old 14 April 2011, 14:36   #5
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Eh, but I don't think he's talking about dolefins or other protusions on the antiventillation plate... (can't see in the pic - but don't seem obvious). I think he is referring to the shape of the hull - and the kind of "longitudinal steps" or "exagerated spray rail" type bits or the hull.
Oh yeah. I hadn't noticed them. No idea what they are. Maybe it's not an avon but one of those things that paul tilley had something to do with... forget the the name now though. Built in Ireland maybe? Sort of trimaran type thing, come up on eBay ever so often and sparks a discussion as to what it is?
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Old 14 April 2011, 14:37   #6
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As Polwart said its the hull I was talking about. The Gemini 6m a similar hull shape to the on in the pic. The reason the Avon are now producing these is because it isn’t really an Avon. Avon's are now Zodiac’s with Avon stamped on the tubes.
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Old 14 April 2011, 14:55   #7
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Maybe someone modified it so that it sits upright if it sits on a drying mooring?
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Old 14 April 2011, 19:01   #8
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there were two at bhg marine.. the pokey down bits were probably 6" and maybe 2" wide at most. Built into the hull and smoothed in at they went forward by approx 1/2 the boat length. Ive never seen anything like it, and it appeared very un avon
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Old 15 April 2011, 08:04   #9
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If I recall they were introduced a few years ago on a certain model - maybe the 5.6 mor 6m ish Adventure hulls to give better handling/ turning charactersitics.

I recall taking to an owner of one who mentioned without them they were a bit 'slippy' in tight turns.

Defo genuine Avon (pre Zodiac) hulls.
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Old 15 April 2011, 08:53   #10
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DAM someone beat me too it. They are to give you extra stability in high speed turns and to improve straight line handeling.

DAM I had this idea 5 years ago even still got the drawings that I made so I could do this to my hull out of stainless steel. DAM ...


lol
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