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Performance Factors

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Chew my RS View Drop Down
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    Posted: 28 Aug 07 at 8:07pm
Originally posted by Guest#260

Interesting, but I am not sure how much I care about the relative performance of a class to another ... what I care about is:

1) is the boat fun to sail

2) is it good for class racing

3) are the people nice to hang out with ....

True enough, but that's not really answering the original question about weight, length, sail area etc.  Anyway, many of us are unwilling or unable to travel the country to get some fleet racing.  So you may as well sail whatever tickles your fancy in the local handicap fleet.

Not sure how to do a 'double quote', but in response to Smight's comments:

N12s are light by most standards - 78kg all up.  Okay, that's more than a Cherub, but still...  Anyway, to clarify my point, a 12ft boat can't have a high maximum displacement speed (some times called hull speed).  Max displacement speed is physically related to boat length, so a 12ft boat can not be as fast a 14ft boat of equally good design.  However, light air performance is also determined by wetted surface area, and 12s are pretty good from that point.

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Post Options Post Options   Quote Guest Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug 07 at 8:32pm
Originally posted by Chew my RS

Originally posted by Guest#260

Interesting, but I am not sure how much I care about the relative performance of a class to another ... what I care about is:

1) is the boat fun to sail

2) is it good for class racing

3) are the people nice to hang out with ....

True enough, but that's not really answering the original question about weight, length, sail area etc.  Anyway, many of us are unwilling or unable to travel the country to get some fleet racing.  So you may as well sail whatever tickles your fancy in the local handicap fleet.

Not sure how to do a 'double quote', but in response to Smight's comments:

N12s are light by most standards - 78kg all up.  Okay, that's more than a Cherub, but still...  Anyway, to clarify my point, a 12ft boat can't have a high maximum displacement speed (some times called hull speed).  Max displacement speed is physically related to boat length, so a 12ft boat can not be as fast a 14ft boat of equally good design.  However, light air performance is also determined by wetted surface area, and 12s are pretty good from that point.

I guess my point is that whilst these issues are of interest the most fun comes from quality fleet racing.

BTW the N12 is 78kgs for the hull, mast & c/b ... I'd guess a sailing weight of about 85kgs.

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Chew my RS View Drop Down
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Post Options Post Options   Quote Chew my RS Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug 07 at 8:45pm
Well that's true.  I stand corrected about the 12.
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Smight at BBSC View Drop Down
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Post Options Post Options   Quote Smight at BBSC Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug 07 at 9:10pm
Ahh now i see what you mean
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Post Options Post Options   Quote redback Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug 07 at 11:41pm
Chew my RS Thanks for putting that together it does help in getting the factors into relative perspective.  It reminds me that Frank Bethwaite went into this in his book which I'd better aquaint myself with again.
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