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Re: TYBEE, and SCHRS [Re: rexdenton] #177964
05/12/09 02:01 PM
05/12/09 02:01 PM
Joined: Dec 2001
Posts: 5,590
Naples, FL
waterbug_wpb Offline
Carpal Tunnel
waterbug_wpb  Offline
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Naples, FL
are the boats about equal in dealing with lumpy water?

Let's just imagine that for the purposes of this question, the wind direction/speed were to put the boats at equal footing


Jay

-- Have You Seen This? --
Re: TYBEE, and SCHRS [Re: waterbug_wpb] #178014
05/12/09 10:22 PM
05/12/09 10:22 PM
Joined: Jun 2001
Posts: 3,116
Annapolis, MD
Mark Schneider Offline OP
Carpal Tunnel
Mark Schneider  Offline OP
Carpal Tunnel

Joined: Jun 2001
Posts: 3,116
Annapolis, MD
The Nacra 20 owes the F18 3 minutes 56 sec per hour of racing under SCHRS. (Scooby... is that an official rating/)

It's a little less under Texel of 3 minutes 34 secs per hour.

Under USPN the difference drops to 3 minutes (2min 59 sec)

The rating system differences are swamped by the prevailing wind direction and pressure.

As Smyth proved over and over again... you need to have an advantage in the light air. In time on time racing... you just can't make up the time when the breeze is on.

It would be interesting to see what would happen if the N20 sailplan had been developed to the degree of the F18's. I bet they would have the same low end gears.

Likewise, if the breeze is on... the 20's really want extra beam oh... say about 10 feet to take advantage of the power....

This is a classic horses for courses game! Who knows what mother nature has in mind next.


crac.sailregattas.com
Re: TYBEE, and SCHRS [Re: Mark Schneider] #178032
05/13/09 02:34 AM
05/13/09 02:34 AM
Joined: Feb 2004
Posts: 3,528
Looking for a Job, I got credi...
scooby_simon Offline
Hull Flying, Snow Sliding....
scooby_simon  Offline
Hull Flying, Snow Sliding....
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Originally Posted by Mark Schneider
The Nacra 20 owes the F18 3 minutes 56 sec per hour of racing under SCHRS. (Scooby... is that an official rating/)



Yes. It's official if it is on the site.

The rating detail is here


F16 - GBR 553 - SOLD

I also talk sport here
Re: TYBEE, and SCHRS [Re: ] #178101
05/13/09 03:23 PM
05/13/09 03:23 PM
Joined: Jul 2001
Posts: 364
Andrew Offline
enthusiast
Andrew  Offline
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Joined: Jul 2001
Posts: 364
Originally Posted by Scarecrow
Originally Posted by pgp
There has been some mention of heavy weather, on the nose, later in the week.


But then the F18's have smaller rigs and similar righting moment. What would you choose.


F18's are 8'2.5" beam, correct? so 98.5" vs N20's 102". Maybe about 3% difference in righting moment? I had a N20 and sold it, partly due to the complexity of rigging for a somewhat-casual sailor like myself, but partly also because of Performance's insistence on one-manufacturer "one-design" sails. This may be eased a bit now, I saw a report of the "Skip Elliot" spinnakers failing. Back in ought-seven, Elliot/Pattison was the maker of record. Anyway, hope the best sailor wins and nobody gets hurt out there.


Andrew Tatton Nacra 20 "Wiggle Stick" #266 Nacra 18 Square #12
Re: TYBEE, and SCHRS [Re: Andrew] #178153
05/14/09 05:46 AM
05/14/09 05:46 AM
Joined: Sep 2006
Posts: 586
Hobart, Tasmania, Oz.
Dazz Offline
addict
Dazz  Offline
addict

Joined: Sep 2006
Posts: 586
Hobart, Tasmania, Oz.
Andrew the F18 is 2.6m wide same as the N20. the n20 is 3 kilos lighter and has a bigger main.


C2 AUS 222 by Goodall design
"Darph Bobo"
Re: TYBEE, and SCHRS [Re: Dazz] #178170
05/14/09 08:51 AM
05/14/09 08:51 AM
Joined: Feb 2004
Posts: 3,528
Looking for a Job, I got credi...
scooby_simon Offline
Hull Flying, Snow Sliding....
scooby_simon  Offline
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Originally Posted by Dazz
Andrew the F18 is 2.6m wide same as the N20. the n20 is 3 kilos lighter and has a bigger main.


What weight are the N20 boats sailing at?


F16 - GBR 553 - SOLD

I also talk sport here
Re: TYBEE, and SCHRS [Re: scooby_simon] #178171
05/14/09 08:59 AM
05/14/09 08:59 AM
Joined: Sep 2006
Posts: 586
Hobart, Tasmania, Oz.
Dazz Offline
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Dazz  Offline
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Joined: Sep 2006
Posts: 586
Hobart, Tasmania, Oz.
Well this is what they advertise... the actual weight might be something else.


http://nacra.us/N20/n20index.html

Length:20' (6.10m)
Width:8'6" (2.59m)
Mast Length:32' (8.13m)
Weight:390 lbs. (177kg)
Mainsail with Mast:208 sq. ft.
Jib:53 sq. ft. (4.15m2)
Spinnaker:270 sq. ft. (23m2)
Construction: vinylester foam, sandwich hulls


C2 AUS 222 by Goodall design
"Darph Bobo"
Re: TYBEE, and SCHRS [Re: Dazz] #178200
05/14/09 11:11 AM
05/14/09 11:11 AM
Joined: Feb 2004
Posts: 3,528
Looking for a Job, I got credi...
scooby_simon Offline
Hull Flying, Snow Sliding....
scooby_simon  Offline
Hull Flying, Snow Sliding....
Carpal Tunnel

Joined: Feb 2004
Posts: 3,528
Looking for a Job, I got credi...
Originally Posted by Dazz
Well this is what they advertise... the actual weight might be something else.


http://nacra.us/N20/n20index.html

Length:20' (6.10m)
Width:8'6" (2.59m)
Mast Length:32' (8.13m)
Weight:390 lbs. (177kg)
Mainsail with Mast:208 sq. ft.
Jib:53 sq. ft. (4.15m2)
Spinnaker:270 sq. ft. (23m2)
Construction: vinylester foam, sandwich hulls


This is nothing like what the boat we have measured for SCHRS.

All up weight is different(we have a heavier boat), Spi area different(we have 25sqm vs 22), Jib Different (4.72 vs 4.15), mainsail similar.

however there is not need to panic.

i just plugged the other values into the rating engine and the reduced sail area and reduced weight changed the rating to 0.938 instead of the measured boat at 0.939 so I do not think this will make a lot of difference.


F16 - GBR 553 - SOLD

I also talk sport here
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