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rodney 
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Joined: 26 Feb 09 Location: United Kingdom Online Status: Offline Posts: 915 |
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 Topic: Devotti Single HanderPosted: 02 Oct 09 at 5:15pm |
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Funny you should say that |
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Daniel Holman
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Joined: 17 Nov 08 Online Status: Offline Posts: 997 |
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Posted: 02 Oct 09 at 10:07pm |
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Using my geeky sh*t and with the Vareo number of 1038 (WL?) As a decent like for like baseline I get:
D1: 950 RS100 (Big Main): 990 RS100 (Small Main): 1015 This is using: ((0.4*(3188*(Length^-0.7775)))+(0.05*(709.06*((Total Displ/Length cubed)^0.346)))+(0.4*(2266.4*(Righting Moment^-0.3661))+(0.1*(868.5*(Upwind Sail Area^-0.2962)))+(0.005*(918.43*(Downwind Sail Area^-0.2208))))- (0.4*(0.4*(3188*(Length^-0.7775)))+(0.05*(709.06*((Total Displ/Length cubed)^0.346)))+(0.4*(2266.4*(Righting Moment^-0.3661))+(0.1*(868.5*(Upwind Sail Area^-0.2962)))+(0.005*(918.43*(Downwind Sail Area^-0.2208)))) i.e the prediction that is weighted by a factor of itself. Again, usual health warnings apply. Sten sailing as distinct from a club level helm is worth well over 100pts in my humble opinion so in essence all this PY chat is hot air really, no?! A graph of some spinnaker dinghies predicted vs actual PY attached. Nick Peters, you're welcome, mate.    Edited by Daniel Holman |
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Nick Peters
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Joined: 08 Feb 06 Location: England Online Status: Offline Posts: 192 |
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Posted: 02 Oct 09 at 11:56pm |
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Daniel - perfect timing - I was just reading this thread and wondering where the RS100 and D1 PY's would end up: I have always come up with a TN after lots of sailing against known benchmark boats - still a bit early for the 100 to put a firm marker in the sand - and I am certainly not that clever (or geeky!!) to tackle the calcs. What data were you using? Latest RS100 data: Beam 1.85 / wl length 4.25 / all up sailing weight 80kg (hull 55kg) / upwind sail area 10.25m / downwind sail area 22.75m. (both big main) Vareo experience would indicate these boats might struggle on short reachy club courses and therefore not actually acheive a theoretical PY. My gut feel was that both would be higher (slower) than Daniels fine calcs. Time will tell. Does anyone know - Rodney? - figures for the D1 - bearing in mind the different rack settings etc. In Y/Y, Andy Rice wrote the hull excl wings is 60kgs - was that meant to be incl wings? Nick
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Nick
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Posted: 03 Oct 09 at 8:32pm |
Hi Mike, Gonna take a rain check on Sunday mate, gonna race at QM instead, got a few tweeks to do before racing wont have time to do that and drive to Burf. See you soon Tim Just posting to the blog |
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Posted: 04 Oct 09 at 6:39pm |
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Fantastic weekend just gone, sorted loads of stuff out. http://d-onedinghy.blogspot.com/ tells it all if you are interested. Think I might have my work cut out on 950 PY but started the learning curve. As Nick says, time will tell Tim |
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alstorer
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Joined: 02 Aug 07 Location: Cambridge Online Status: Offline Posts: 2899 |
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Posted: 04 Oct 09 at 8:09pm |
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Saw a D-One out on the water at Hayling Island today. Looks a lot prettier from a distance than it does close up :p Wasn't paying it much attention what with the racing, but it seemed to be moving pretty smartly.
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Al |
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Posted: 04 Oct 09 at 8:51pm |
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Interesting comment. What is it that you don't like up close? I certainly moved fast this weekend, Sat was a baptism of fire, and I hadn't attached the main halyard correctly so it slipped down....some of the pictures don't do it justice, however fied that now and today was a lovely sail. Tim |
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G.R.F.
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Joined: 10 Aug 08 Location: United Kingdom Online Status: Offline Posts: 4028 |
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Posted: 04 Oct 09 at 8:56pm |
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Just as a matter of interest, what did you end up paying for it tim?
I heard they were going to support the exchange rate, so what sort of money was it? Or did you get some special web P.R. deal? 
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Daniel Holman
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Joined: 17 Nov 08 Online Status: Offline Posts: 997 |
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Posted: 04 Oct 09 at 9:07pm |
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Nick:
I was going on: RS100 L=4.3 B=1.83 SAup=10m2 Kite =11m2 Sailing Weight=76kg i.e data that is probably immature, but not significantly different. Kite area has not got a large effect on overall performance. D1 L=4.23 B=2.31 SAup=11m2 Kite =15m2 Sailing Weight=75kg Both make RM & tot Displ assumptions based on a (kitted up) 100kg 1.9m sailor The graph that I just posted gives all spinnaker boats to the aforementioned regression formula, giving a decent fit across the performance range. NB the D1 and RS100 are both to the left of the mean line, the same amount as the Vareo, as the disparate nature of the craft under consideration (i.e. Gull to 49er) means that how the data fits the "type" of boat will determine where they sit on the graph, so more accurate estimations can be made by jusdging against broadly similar craft.  |
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alstorer
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Joined: 02 Aug 07 Location: Cambridge Online Status: Offline Posts: 2899 |
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Posted: 04 Oct 09 at 10:20pm |
It's mainly things that I appreciate are cases of function over form- the wing arrangement is pretty ungainly and the offset pole makes it look like an after thought (as it is possible to have, without wing-wangs, centre line bowsprits that come past the past with careful design). The foredeck is less than pretty too. Of course, this doesn't matter really if it's good to sail, does it? |
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Al |
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