| Re: Carnac 2012 - results
[Re: Gilo]
#247552 04/29/12 07:52 AM 04/29/12 07:52 AM | MarkMT
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| MarkMT
Unregistered | | | | Re: Carnac 2012 - results
[Re: Gilo]
#247719 05/03/12 05:24 PM 05/03/12 05:24 PM |
Joined: Oct 2002 Posts: 606 Maryland Kris Hathaway
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Posts: 606 Maryland | Those are some seriously long daggers on the Q. Photo #359. Pic
Kris Hathaway | | | Re: Carnac 2012 - results
[Re: Kris Hathaway]
#247722 05/03/12 05:40 PM 05/03/12 05:40 PM |
Joined: Oct 2002 Posts: 606 Maryland Kris Hathaway
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Posts: 606 Maryland | First time I've seen both spin blocks on the front beam. Looks like the blocks closest to the chute's clew can slide independently outboard to "open" up the chute. Pic
Kris Hathaway | | | Re: Carnac 2012 - results
[Re: Kris Hathaway]
#247724 05/03/12 05:59 PM 05/03/12 05:59 PM |
Joined: Jun 2001 Posts: 9,582 North-West Europe Wouter
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Posts: 9,582 North-West Europe |
Last edited by Wouter; 05/03/12 06:00 PM.
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands
| | | Re: Carnac 2012 - results
[Re: Kris Hathaway]
#247748 05/04/12 08:57 AM 05/04/12 08:57 AM |
Joined: Dec 2001 Posts: 5,590 Naples, FL waterbug_wpb
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Posts: 5,590 Naples, FL | First time I've seen both spin blocks on the front beam. Looks like the blocks closest to the chute's clew can slide independently outboard to "open" up the chute. Pic would having the spin block on the beam like that shorten the foot of the spinnaker?
Jay
| | | Re: Carnac 2012 - results
[Re: waterbug_wpb]
#247829 05/06/12 06:51 AM 05/06/12 06:51 AM |
Joined: Sep 2005 Posts: 893 waynemarlow
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Posts: 893 | First time I've seen both spin blocks on the front beam. Looks like the blocks closest to the chute's clew can slide independently outboard to "open" up the chute. Pic would having the spin block on the beam like that shorten the foot of the spinnaker? No most spinny's have now been limited to min foot length by the definition of what is a spinnaker and what is a reaching sail( see SCHRS for definition )ie we are all at min foot length already due to the apparant wind requiring very flat sails. By choice I would be even flatter if the handicap system would allow it. On the Cirrus I would suspect they have moved the front beam back as per A Class design and kept the max 3.5m spinny pole and thus the blocks have to go as far foward as possible. This is excactly what I found on my boat which was derived from an A design and was rather unpleasantly surprised to have to move the spinny blocks foward onto the beam. I am looking at chopping the spinny pole some 300mm or so to get some sort slot effect back from the Spinny back onto the main. Do we need the pole at max length on these boats ? The downsides of moving the beams back are lack of crew operating room and more reliance on volume way back to cover the crews weight,the upsides are less volume needed up front and if the pole is cut, less uplift from the Spinny. | | | Re: Carnac 2012 - results
[Re: waynemarlow]
#247832 05/06/12 07:40 AM 05/06/12 07:40 AM |
Joined: Jun 2001 Posts: 9,582 North-West Europe Wouter
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Posts: 9,582 North-West Europe | Even with my Goodall spinnaker from 2004 I used blocks on the main beam. In the last few years to spi's have only become shorter in the foot.
"Do we need the pole at max length on these boats ?"
Actually, we never did. That rule was only included in the F16 rules to satisfy Texel and SCHRS handicap systems that have some formula that determines max spi pole length.
That formula is a pain in the neck and so I just took the virtual F16 with its mainbeam halfway the hull and worked out that like that we could have a 3.5 mtr spi pole and still not break the Texel or SCHRS rules. At that time, from comparisons to F18's, I already knew that we would be using shorter poles. Mine is actually 3.25 mtr. and seems to nicely balance the boat. I did try 3.5.mtr but the leehelm became a problem. I tried several intermediate positions as well, but 3.25 mtr worked best and then I still have to place my last blocks on the main beam. This does clear up the area around the side stay though (an unexpected benefit).
I'm still convinced that 3.50 mtr spi poles are too long for F16. I mean, you can sail with that, but the optimal length both balance and speed wise seems to be less then that. Remember that our forestays are relatively far back as well, partly due to the use of bridle struts that makes our jib foot come out very low. The slot between the spi and jib luffs is pretty big already on F16's. Equal in size of larger then the ones on F18's.
I recall that Blades, Falcons and others are using less then 3.50 as well.
Wouter
Last edited by Wouter; 05/06/12 07:45 AM.
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands
| | | Re: Carnac 2012 - results
[Re: macca]
#247839 05/06/12 08:33 AM 05/06/12 08:33 AM |
Joined: Jun 2001 Posts: 9,582 North-West Europe Wouter
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Posts: 9,582 North-West Europe | Come to think of it.
When is that ultimate F16 of yours coming out ?
You have been advising everyone on everything related the F16's over the last ohh 8 years now and up till now that is all that you have done. Talk.
You are proving to be more and more like Douglord with any new post.
Last edited by Wouter; 05/06/12 08:34 AM.
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands
| | | Re: Carnac 2012 - results
[Re: macca]
#247841 05/06/12 08:36 AM 05/06/12 08:36 AM |
Joined: Jun 2001 Posts: 9,582 North-West Europe Wouter
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Posts: 9,582 North-West Europe | Well, clearly you are not busy enough. C ya !
Last edited by Wouter; 05/06/12 08:36 AM.
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands
| | | Re: Carnac 2012 - results
[Re: macca]
#247846 05/06/12 08:41 AM 05/06/12 08:41 AM |
Joined: Jan 2009 Posts: 5,525 pgp
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Posts: 5,525 | I'm kind of busy with a much bigger project... Not busy enough it seems.
Pete Pollard Blade 702
'When you have a lot of things to do, it's best to get your nap out of the way first.
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