the last people who were knocking the dolphin idea said it was stupid because dolphins went through the water not over it.............just sounds like white noise to me.
-- Have You Seen This? --
Re: New A-class with a radical bow shape
[Re: warbird]
#112576 09/03/0704:34 AM09/03/0704:34 AM
For example is not really well developped. Afterall the centrehull is still very much a conventional shape. If that had been of the same shape as the floats then you example would have been a proper one in relation to this new cat design.
Yes. Also, the float volume is placed high in the bow, so it looks like the new shapes but differs in one relevant feature.
On the other hand, when it flies the mainhull the lee float behaviour becomes dominant.
I guess the similitude would be the relatively low volume float. How does float volume/total displacement ratio in the new A Cats and F16s compare to that tri's 110%?
Luiz
Re: New A-class with a radical bow shape
[Re: Luiz]
#112578 09/03/0702:04 PM09/03/0702:04 PM
On the other hand, when it flies the mainhull the lee float behaviour becomes dominant.
That or rather the lift provided by its bruce foil ?
I think it should be both: the bruce foil is supposed to lift 50% of total weight. That would leave 60% of the float volume over the waterline and 50% under. I'll let you know after a real world test.
Luiz
Re: New A-class with a radical bow shape
[Re: ]
#112580 09/03/0706:01 PM09/03/0706:01 PM
Don't be like that Wouter, we're only having fun. I can imagine it is tough to live with a huge ego and low self-esteem but an abusive outburst never really brings satisfaction in the long term. Try sitting quietly with yourself (no touching), breath deeply and paint your boat a less lurid colour and maybe you won't feel such a desperate need to be right all of the time.
Re: New A-class with a radical bow shape
[Re: warbird]
#112582 09/04/0703:37 AM09/04/0703:37 AM
[quote]Pictures look good. Has the the A cat been tried against any other boats to see performance against them?
Doug
Hi Doug, Im the designer and yes it has, but less exhaustively than one could have hoped for so far. It would appear that the boat is moderately faster and sails higher than Flyers etc in all windspeeds, down hill in any wind, it kills everything. This last weekend it was out in 25-30 knots all day with 10-15 gusts and it never put the bow down more than 150mm at any speed in any gust. That said, we are still learning to sail it, the windward case being the most challenging and we are still a ways short of what we think it should do. Have attached a couple of pics from GPS action replays of the Velocitek data to show what it does in 9.4 knots, will post some 30 knot stuff in the not too distant future RG
Re: New A-class with a radical bow shape
[Re: RetiredGeek]
#112584 09/04/0704:01 AM09/04/0704:01 AM
[quote]Pictures look good. Has the the A cat been tried against any other boats to see performance against them?
Doug
Hi Doug, Im the designer and yes it has, but less exhaustively than one could have hoped for so far. It would appear that the boat is moderately faster and sails higher than Flyers etc in all windspeeds, down hill in any wind, it kills everything. This last weekend it was out in 25-30 knots all day with 10-15 gusts and it never put the bow down more than 150mm at any speed in any gust. That said, we are still learning to sail it, the windward case being the most challenging and we are still a ways short of what we think it should do. Have attached a couple of pics from GPS action replays of the Velocitek data to show what it does in 9.4 knots, will post some 30 knot stuff in the not too distant future RG
The best test will be for Ian to head to Bristol and test the boat against benchmark A-Class sailors like Ben Hall, Lars Guck, and Phil Kinder. Until he does that, any claims on performance are pure speculation. I would bet that Ian is simply a better A-Class sailor than the sailors he has been sailing against so even if the boat's performance is equivalent to a Flyer or something else current, it will look faster due to the sailor's ability.
The boat is quite interesting. The hulls look like missles!
Bob Hodges A2 USA 230
Re: New A-class with a radical bow shape
[Re: Acat230]
#112593 09/04/0707:12 PM09/04/0707:12 PM
The best test will be for Ian to head to Bristol and test the boat against benchmark A-Class sailors like Ben Hall, Lars Guck, and Phil Kinder. Until he does that, any claims on performance are pure speculation. I would bet that Ian is simply a better A-Class sailor than the sailors he has been sailing against so even if the boat's performance is equivalent to a Flyer or something else current, it will look faster due to the sailor's ability.
The boat is quite interesting. The hulls look like missles!
Bob Hodges A2 USA 230
Bob, I agree that its real performance won't be known till then either, I believe that will happen when everyone goes to the Lake Hopatcong Regatta Sept 29th RG
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