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by midraed. 10/06/20 09:56 AM
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F18 mast position with spinny up #278754
05/03/15 10:02 AM
05/03/15 10:02 AM
Joined: Sep 2005
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waynemarlow Offline OP
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waynemarlow  Offline OP
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Not having owned an F18 before, where is everyone putting the mast rotation when the spinny is up. Coming from using an A class mast where one simply lets off the mast rotation and the mast generally goes fully out and that is considered to be the strongest axis for the mast, is the F18 any different ?

Some at my club are saying that the mast shouldn't be let out significantly from the upwind position but my worry is that should on A Class terms put the mast into its weakest position. Am I correct on this.

Thanks

-- Have You Seen This? --
Re: F18 mast position with spinny up [Re: waynemarlow] #278756
05/03/15 10:57 AM
05/03/15 10:57 AM
Joined: Feb 2005
Posts: 4,118
Northfield Mn
Karl_Brogger Offline
Carpal Tunnel
Karl_Brogger  Offline
Carpal Tunnel

Joined: Feb 2005
Posts: 4,118
Northfield Mn
You let it out all the way.


I'm boatless.
Re: F18 mast position with spinny up [Re: waynemarlow] #278762
05/03/15 02:30 PM
05/03/15 02:30 PM
Joined: Jul 2001
Posts: 2,844
42.904444 N; 88.008586 W
Todd_Sails Offline
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Todd_Sails  Offline
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42.904444 N; 88.008586 W
Agree with Karl, ^ he peaks catamaran.

Karl, I hope to see you at Rock lake Memorail weekend?
Are you in the GT300 this year?
I'll be there WITH my 1/2 ton truck! ;-)



F-18 Infusion
#626- SOLD it!

'Long Live the Legend of Chris Kyle'
Re: F18 mast position with spinny up [Re: waynemarlow] #278767
05/03/15 06:15 PM
05/03/15 06:15 PM
Joined: Jun 2001
Posts: 3,906
Clermont, FL, USA
David Ingram Offline
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David Ingram  Offline
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Joined: Jun 2001
Posts: 3,906
Clermont, FL, USA
The above comments are correct and present the strongest profile to the loads being applied by the spinnaker but are not necessarily the fastest. This has been hinted at by comments related to mast breakage with the N17 and even Macca made a comment that you trim the mast rotation to the mainsail trim. So... how bad do you want to win and are you willing to replace your mast and mainsail?


David Ingram
F18 USA 242
http://www.solarwind.solar

"Do or do not. There is no try." - Yoda
"Excuses are the tools of the weak and incompetent" - Two sista's I overheard in the hall
"You don't have to be a brain surgeon to be a complete idiot, but it helps"
Re: F18 mast position with spinny up [Re: waynemarlow] #278769
05/03/15 06:45 PM
05/03/15 06:45 PM

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Scarecrow
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Scarecrow
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^^^ What he said^^^

90 degrees is safe, around 60 degrees is fast. You'll need to experiment and adjust to find what is right for the boat and conditions.

Same goes with your main sheet. Firm and cleated is safe, constantly played is fast.

Re: F18 mast position with spinny up [Re: waynemarlow] #278795
05/04/15 10:39 AM
05/04/15 10:39 AM
Joined: Sep 2005
Posts: 893
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waynemarlow Offline OP
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waynemarlow  Offline OP
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Thanks guys, just thought I may have the wrong settings, but our letting full out is in that 60 - 90 degree range so we are'nt far off.

I've been playing travellor rather than main sheet, simply cleating the main at just off upwind tensions and letting the tell tails dictate the travellor settings.

Our courses are so short and congested with slower boats that sometimes it just better to get my head out of the boat and sail on a set tension than to bother to try and adjust all of the time.

Re: F18 mast position with spinny up [Re: waynemarlow] #278800
05/04/15 11:57 AM
05/04/15 11:57 AM
Joined: Feb 2005
Posts: 4,118
Northfield Mn
Karl_Brogger Offline
Carpal Tunnel
Karl_Brogger  Offline
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Joined: Feb 2005
Posts: 4,118
Northfield Mn
The problem with dropping traveller is that you aren't really changing the shape of the sail, just the angle of attack. Another issue is that you are presenting more sail to the wind coming from behind if you stuff it and the apparent wind comes around. You're actually compounding the problem of putting more pressure on the bows. Easing the main will open up the top too, but you're also changing the shape of the sail through the middle to a more powerful shape, which can help pull you out of the bows plowing through the water scenario and get moving again..

You should pretty much just be dropping off traveller to reach up, like if you're overstood, and can't carry the angle you need to make the mark. Being a singlehander, I don't trim the main downwind unless it's really out of shape.


I'm boatless.
Re: F18 mast position with spinny up [Re: waynemarlow] #278847
05/05/15 08:07 PM
05/05/15 08:07 PM
Joined: Jun 2001
Posts: 3,293
Long Beach, California
John Williams Offline
Carpal Tunnel
John Williams  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 3,293
Long Beach, California
Think of the traveller as a gross adjustment and the mainsheet as a fine adjustment. You really will go faster trimming the main - unless you're surviving or overstood (violates Kirk's First Commandment of Catamaran Racing - thou shalt not overstand the gate), the traveller is a crutch... and crutches ain't fast.


John Williams

- The harder you practice, the luckier you get -
Gary Player, pro golfer

After watching Lionel Messi play, I realize I need to sail harder.

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