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K1 single-handed keelboat

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Post Options Post Options   Quote asterix Quote  Post ReplyReply Direct Link To This Post Topic: K1 single-handed keelboat
    Posted: 22 Sep 09 at 8:43am
simply solved with a life line though?
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 22 Sep 09 at 8:47am
Jib booms on the N12 certainly didn't work, but on a one design, where absolute speed isn't an issue, it could make sense. If I sailed somewhere which didn't have weed (the Martin 16's really get caught) and shallow bits, I'd be very interested.
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Post Options Post Options   Quote Paul Handley Quote  Post ReplyReply Direct Link To This Post Posted: 22 Sep 09 at 8:51pm
Originally posted by Rupert

Jib booms on the N12 certainly didn't work, but on a one design, where absolute speed isn't an issue, it could make sense. If I sailed somewhere which didn't have weed (the Martin 16's really get caught) and shallow bits, I'd be very interested.


I've learnt today that some Int Canoes use jib booms, so they can work well on dinghies as well as model yachts.

Weed could be an issue but the keel is slightly raked towards the bulb, i.e. its not forward protruding like SB3, Melges etc.  I don't know what the Martin 16 keel arrangement is though
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Post Options Post Options   Quote farc anal Quote  Post ReplyReply Direct Link To This Post Posted: 22 Sep 09 at 10:03pm

make it 19'6" long

big assymetric

 

wings to  sit on

 

praps would buy one when i get more wrinkled

 

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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 23 Sep 09 at 8:11am

Paul, the video on this page shows a modified NS14 with a similar jib boom arrangement.  It seems to work pretty well.

How is the hull designed to work better at an angle of heel?  Are the waterlines a better shape when heeled, say, 10 degrees, or does the waterline length somehow increase? I thought you needed overhangs to get an increase in length?.

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Post Options Post Options   Quote Paul Handley Quote  Post ReplyReply Direct Link To This Post Posted: 23 Sep 09 at 8:40pm
Originally posted by Peaky

Paul, the video on this page shows a modified NS14 with a similar jib boom arrangement.  It seems to work pretty well.

How is the hull designed to work better at an angle of heel?  Are the waterlines a better shape when heeled, say, 10 degrees, or does the waterline length somehow increase? I thought you needed overhangs to get an increase in length?.


Yes, the jib boom looks good on these boats and appears to be the same arrangement as we've used on the prototype, although I can't see if there are any other control lines being used.  Anyway I'm sure we will get the jib boom to work well on the K1 too.

The hull isn't really working better at an angle of heel, just the more the boat heels the more righting moment is gained from the keel bulb.  So the hull has to be effective when heeled as well as upright, as for any yacht.  With a long, narrow hull the underwater shape hardly changes as the boat heels so the boat remains well balanced and light on the helm when well heeled.  Any change in the waterline length will be negligible because of the narrow transom and absence of overhang. 
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Post Options Post Options   Quote tickler Quote  Post ReplyReply Direct Link To This Post Posted: 23 Sep 09 at 10:41pm
With me old model boats 10 rater and A class both worked on a waterline/sail area computation (only we had no computers then), longer  waterline less sail. Boats were designed to get longer as they heeled. I suppose some big boats do this?
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 24 Sep 09 at 8:13am

Thanks for the reply Paul.  So I suppose it would be a bit quicker to hike and keep it upright, but you are less slowed down with a bit of heel than you would be in a normal dinghy.  That should keep the racing tight between the young and fit and the old and wise.

 

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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 24 Sep 09 at 6:31pm

Originally posted by tickler

With me old model boats 10 rater and A class both worked on a waterline/sail area computation (only we had no computers then), longer  waterline less sail. Boats were designed to get longer as they heeled. I suppose some big boats do this?

Boats like the 22sqmetre and the scandinavian classes that are similar are designed to do exactly that. There must be a reduction in rig efficiency, though?

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Post Options Post Options   Quote William H Frump Quote  Post ReplyReply Direct Link To This Post Posted: 24 Sep 09 at 8:46pm

Is there anywhere on board to keep a dog?

Big Willi

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