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Historical Handicap for Phantom
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maxibuddah View Drop Down
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    Posted: 10 Jul 23 at 8:49pm
Originally posted by Wetabix

Thanks v much - glad to see that you're still alive after all these years! Do you still have a Phantom? That tells me all I need to know including giving me a guide to what the conversion factor between the three digit and four digit system is, which I had thought was a simple times ten but it seems I am wrong there.

Not anymore, got a K1 now after going through a D-One, Finn, Phantom again & OK. But still sailing. Glad to see you are still at it
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Easy-peasy, just use contemporary PN's and do the sums  Big smile
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Posts: 118 		Post Options Post Options   Quote Wetabix Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 23 at 7:53pm
So what I want to know is how much faster than a Laser did I have to go to save my time then, and how much faster would I have to go today?
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Posts: 3401 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 23 at 7:50pm
I bow you your greater knowledge  Thumbs Up 

FWIW the numbers change every year and I'm sure they could allow them to creep up without needing to apply a conversion factor as such. When I was first involved in dinghy racing in around 1965 I remember the Firefly being sometimes referred to as the 'scratch boat' with a PN of 100 but I've learned since that the Firefly PN was not 100 for long (or maybe at all Embarrassed). 

The idea of maintaining a single class as the benchmark sounds good but all classes get faster over time, even the ubiquitous L@ser...
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JimC View Drop Down
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 23 at 6:41pm
Conversion factors - I believe that strictly speaking there wasn't a conversion factor in 1996, the numbers were recalculated. In practice the actual ratio varied between 9.32 and 9.91, and 9.47 is a good approximation. In 1977 it was 1.2.
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Sam.Spoons View Drop Down
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Posts: 3401 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 23 at 10:11am
They didn't just add a digit when they went from base 100 to base 1000 they also added around 7% so actually multiplied by around 10.7. This has happened twice as boats have been getting faster, granularity is reduced as numbers get lower so a percentage was added so that (approximately) half the numbers fall below 1000 (previously 100) and half above.
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Wetabix View Drop Down
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Posts: 118 		Post Options Post Options   Quote Wetabix Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 23 at 7:27am
Thanks v much - glad to see that you're still alive after all these years! Do you still have a Phantom? That tells me all I need to know including giving me a guide to what the conversion factor between the three digit and four digit system is, which I had thought was a simple times ten but it seems I am wrong there.
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maxibuddah View Drop Down
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Posts: 1760 		Post Options Post Options   Quote maxibuddah Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 23 at 7:15am
back in the day George, a Finn was 113 iirc and now its 1060ish and a Phantom was about 1051 so would be about 112 in old money at a guess
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jul 23 at 4:29pm
Carbon spars make a big difference. With hindsight I believe that carbon spars and foam sandwich hulls should have been handicapped separately as was done with terylene sails back in the day.
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Wetabix View Drop Down
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Posts: 118 		Post Options Post Options   Quote Wetabix Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jul 23 at 1:24pm
Actually, back then I had an early grp boat , 947,  which was rather heavy by modern standards and replaced it with 1036 and then 1260. I now have a wooden one, 903, with a carbon rig by an unknown mast maker - possibly Claridge. My recollection (which may be false) is that in those days I had a handicap of about 117 which might explain why in those days I did quite well but today I do less well, even with the wooden boat PN of 1047 as per the class website. There may be other reasons of course, like being 80 and having lost four stone, but I would be interested to know.
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