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Best spinnaker halyard line material?
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Re: See the F20c in person [Re: mikekrantz] #222183
10/20/10 12:45 PM
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Mike,

The boat looks sweet, but the sail looks like the graphic on a designer pocketbook, its awful, I threw up in my mouth a little.

Bill

-- Have You Seen This? --
Re: See the F20c in person [Re: bvining] #222185
10/20/10 12:55 PM
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Originally Posted by bvining
Whats it weigh all up?

Width is 8'6"?

Is the mast carbon or aluminum?

Sorry for being lazy and not looking this up.

Bill



360lbs (give or take)
carbon stick (narrow wing section ala scaled up F16/F18)
10.5 foot beam


and, for the record, I'm going to end this post lightly insulted on the sail comment!


Jake Kohl
Re: See the F20c in person [Re: Jake] #222188
10/20/10 01:17 PM
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who makes the mast?

Re: See the F20c in person [Re: PTP] #222191
10/20/10 01:55 PM
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Funny how wider than 8'-6" beam is suddenly acceptable...somewhere behind the scenes, Bill Roberts is probably saying something like "Welcome to the party...I have been trying to tell you this for the last 40 years"...

Re: See the F20c in person [Re: Karl_Brogger] #222192
10/20/10 01:59 PM
10/20/10 01:59 PM
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Originally Posted by Karl_Brogger
Originally Posted by macca
Karl, I dont understand why a ferrari costs more than a hyundai, I mean they both have 4 wheels and an engine...


We ain't comparing Hyundai's and Ferrari's. We're comparing Hyundai's to Hyundai's. Its a slight variation, not a whole new frickin' breed of animal. I said it before, I don't know much about boat building. As far as I know you're laying a pliable material into a mold, whether its got a curve or not, I don't see the difference, but I would like too.



Originally Posted by Macca
And let me assure you that its not possible to have a flat pack mould that bolts together... next we will have Ikea doing them!


Okay if you say so, plenty of things are bolted together that hold up just dandy under some very extreme loads. But I still would like to know why. I like to learn things, and just saying "no" wrapped up in your ****/kunt like attitude isn't enough info for me. What Jake was getting at is that a giant block of material can get expensive, especially when most of it is going into the recycling bin. Furthermore if it is really big then there are issues of finding people that can deal with it, which if you're in a niche market you get to charge pretty much what you want and tell people to go screw themselves with a smile while they pay you knowing they'll be back because there just isn't any other options. Like I said, if a billet aluminum race car chassis can be machined and assembled and hold up to what a track and a whole mess of hp can throw at it, I don't see why something simple like this can't be done that way as well. Or, perhaps its something that hasn't been explored yet in this application and should be? There's always a better mousetrap to be built, or a better way to build it(whether it improves the product or the production), regardless of what you manufacture.


Originally Posted by macca
Sure, its possible to build a curved board in your backyard, but to do a production quality run with repeatability, control and warranty is not such an easy task.


Never said anything different. I'm just curious why you say the boards are soooo inexpensive, yet say production is soooo costly. That business model doesn't hold up for too long.



Originally Posted by macca
Look at it this way: If it was so easy then why isn't everyone out there doing it?


Give it time and it probably will be, right now its still in the voodoo magic category. Sailing has been around for how many thousands of years? How long did it take to just be able to go to weather? How far has it come in the past 50-25-10-5 years? I'm in the camp where I'd like to see the A-cats, F18's, and F16's (or whatever) take advantage of everything they can in both material and design.


You know,

Not that you wouldn't think so, but Karl is actually a nice guy when you meet him in person; ;-).


F-18 Infusion
#626- SOLD it!

'Long Live the Legend of Chris Kyle'
Re: See the F20c in person [Re: Seeker] #222193
10/20/10 02:07 PM
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Originally Posted by Seeker
Funny how wider than 8'-6" beam is suddenly acceptable...somewhere behind the scenes, Bill Roberts is probably saying something like "Welcome to the party...I have been trying to tell you this for the last 40 years"...


Well Bill Roberts should probably get that chip off his shoulder. The only reason that its "suddenly become acceptable" is because the dealer in North America is offering a turn-key tilt trailer that literally adds 30 seconds to setup and breakdown time over your traditional-width cats.

The extra width is also needed for the curved boards since the lift forces on the curved boards decrease righting moment via the leward board.

Re: See the F20c in person [Re: mikekrantz] #222196
10/20/10 02:15 PM
10/20/10 02:15 PM
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Originally Posted by mikekrantz
Having sailed a gazillion miles (give or take a couple) on A-cats, F-18's, N-20's, and the infamous 18HT. I think I'm somewhat qualified to compare the various platforms and the difficulty it takes to extract maximum performance.
The F20c is no more difficult to get up to speed than any of the others. There are some nuances that you need to be aware of, fore/aft weight placement and board height are significant adjustments. However the boat provides lots of feedback to help you make those corrections. Anyone that has spent enough time most other cats will recognize this, and pick up on it right away.

Just my .02 cents worth...


So, in your opinion, would you say the "peak performance envelope" is more narrow than an identical platform (pick one) with straight boards?

For the purpose of this side discussion, we'll presume that while operating within this "envelope" the curved boards are faster...




Jay

Re: See the F20c in person [Re: ThunderMuffin] #222197
10/20/10 02:18 PM
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Undecided....make sure you understand that I was saying what "I thought his reaction would be"....not anything that Bill Roberts actually said...don't attribute anything I said on the subject to him...to my knowledge he hasn't said a word about it.

Re: See the F20c in person [Re: Seeker] #222203
10/20/10 02:41 PM
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Some boats are just more sensitive to weight placement. The 18HT was extremely sensitive to fore/aft weight position. We used to joke about needing running shoes to help our feet for all the miles we walked up and down that hull during the T500.

Re: See the F20c in person [Re: Jake] #222204
10/20/10 02:44 PM
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Sorry Jake, I wont make fun of the graphics any more today.

two more questions - how tall is the mast? Is it $30k all up?

I like it. Except for the ugly graphics - (ooops forgot my promise)

And nice video Macca, made me want one. The sailing one, not the one in the dark showing off one hull, that sucked.

Re: See the F20c in person [Re: bvining] #222207
10/20/10 02:55 PM
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34 ft mast (10.5m upper measurement band to beam)
$26.5k ready to sail - FOB Buford, GA


Re: See the F20c in person [Re: bvining] #222208
10/20/10 03:05 PM
10/20/10 03:05 PM
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Originally Posted by bvining
Sorry Jake, I wont make fun of the graphics any more today.

two more questions - how tall is the mast? Is it $30k all up?

I like it. Except for the ugly graphics - (ooops forgot my promise)

And nice video Macca, made me want one. The sailing one, not the one in the dark showing off one hull, that sucked.


Well, aren't you in a brutally honest mood today! ;-)



Jake Kohl
Re: See the F20c in person [Re: mikekrantz] #222209
10/20/10 03:10 PM
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Originally Posted by mikekrantz
I don't have enough time on the boat in heavy air to comment just yet. However, Macca should chime in with some real time experience in those conditions and comparisons.


Thx Mike. I'd assume it depowers pretty effectively, so a wide range of weights could be accomodated. Time will tell where the sweet spot lies.

Do you see similarities with the Infusion sail cut and the F20c sail cut? That is a big update from the N20, I'd guess.


Tom
Re: See the F20c in person [Re: Jake] #222210
10/20/10 03:11 PM
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To be fair, Jake just cut the vinyl, he didn't design the graphics :P

Re: See the F20c in person [Re: ThunderMuffin] #222214
10/20/10 03:21 PM
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Both sets of sails come from Performance Sails. We have always been happy with their quality and design. The main on the F20c really looks similar to a big A-cat main. It's 8ft across at the foot, and 4ft across at the head.

Re: See the F20c in person [Re: ThunderMuffin] #222216
10/20/10 03:32 PM
10/20/10 03:32 PM
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Originally Posted by Undecided

The extra width is also needed for the curved boards since the lift forces on the curved boards decrease righting moment via the leward board.


Eh? The leeward board is pushing the hull up, thus increasing RM!!!


F16 - GBR 553 - SOLD

I also talk sport here
Re: See the F20c in person [Re: scooby_simon] #222217
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Originally Posted by scooby_simon
Originally Posted by Undecided

The extra width is also needed for the curved boards since the lift forces on the curved boards decrease righting moment via the leward board.


Eh? The leeward board is pushing the hull up, thus increasing RM!!!


Yeah but since the board is also curved - some of that force directed upwards at the tip end of the board is going to result in a "torquing" of the hull, meaning that its effectively going to rotate the leward hull outboards.. increasing the amount of capsize moment.

You might be right though that the effect of the board lifting overall would equalize the effect of the boat spinning the leward hull outwards.

Re: See the F20c in person [Re: ThunderMuffin] #222225
10/20/10 10:47 PM
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Those interested in the construction process of curved boards should go look at the DNA A-cat web site. While NACRA may be using an entirely different process, it does give one possible way of building state of the art pre-preg curved carbon boards using autoclave technology. Their molds are made of high temperature composites and appear to be much less complex than those which have been speculated about, on this thread, and others touching on the subject.

DNA is refreshing transparent about their building process. Rather than dodging questions and shrouding their design/construction in ambiguity and mystery, they lay it all out on the table for everyone to see and give their reasoning behind their design decisions.

Re: See the F20c in person [Re: scooby_simon] #222236
10/21/10 02:08 AM
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Originally Posted by scooby_simon
Originally Posted by Undecided

The extra width is also needed for the curved boards since the lift forces on the curved boards decrease righting moment via the leward board.




Eh? The leeward board is pushing the hull up, thus increasing RM!!!


reduced RM... look where the COE of the board is in relation to the hull centerline.

Last edited by macca; 10/21/10 02:09 AM.

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Re: See the F20c in person [Re: Seeker] #222238
10/21/10 02:11 AM
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Originally Posted by Seeker
Those interested in the construction process of curved boards should go look at the DNA A-cat web site. While NACRA may be using an entirely different process, it does give one possible way of building state of the art pre-preg curved carbon boards using autoclave technology. Their molds are made of high temperature composites and appear to be much less complex than those which have been speculated about, on this thread, and others touching on the subject.

DNA is refreshing transparent about their building process. Rather than dodging questions and shrouding their design/construction in ambiguity and mystery, they lay it all out on the table for everyone to see and give their reasoning behind their design decisions.


A lot of builders don't even care to grace this forum, and its entirely up to them if they wish to share information at all. I am more than happy to update and give info from my point of view. but if you don't like it I can stop?


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