| Re: Chute sailing
[Re: ThunderMuffin]
#173064 03/27/09 12:22 PM 03/27/09 12:22 PM |
Joined: Jan 2005 Posts: 6,049 Sebring, Florida. Timbo
Carpal Tunnel
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Carpal Tunnel
Joined: Jan 2005
Posts: 6,049 Sebring, Florida. | The spinnaker bail is usually mounted well above the hounds so if you don't give the top of the mast some type of back-support via the mainsail leach being tight, in a good puff + stuff scenario, you could break the mast.
Blade F16 #777
| | | Re: Chute sailing
[Re: Timbo]
#173065 03/27/09 12:25 PM 03/27/09 12:25 PM |
Joined: Aug 2007 Posts: 93 virginia beach, VA dsltrc
journeyman
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journeyman
Joined: Aug 2007
Posts: 93 virginia beach, VA | your shrouds don't go all the way to the top of the mast, so if you didn't sheet in when flying your spin you would probably pull the unsupported part of the mast(above the mast tang) forward till it failed... so wen you sheet in the sail acts like the backstay....
Last edited by dsltrc; 03/27/09 12:25 PM.
Jason DiPietro
supercat 19
| | | Re: Chute sailing
[Re: ThunderMuffin]
#173066 03/27/09 12:26 PM 03/27/09 12:26 PM |
Joined: Aug 2005 Posts: 2,921 Michigan PTP
Carpal Tunnel
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Carpal Tunnel
Joined: Aug 2005
Posts: 2,921 Michigan | Furthermore, your apparent wind is so far forward than sheeting in is actually the correct trim for the main.
by the same logic, why do we "blow" the rotation downwind? It seems excessive to allow 90 degree rotation when the apparent wind is still ahead. I don't go to 90 deg, but you get my point. | | | Re: Chute sailing
[Re: Headhunter]
#173067 03/27/09 12:28 PM 03/27/09 12:28 PM |
Joined: Apr 2008 Posts: 921 Alachua, FL Mugrace72
old hand
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old hand
Joined: Apr 2008
Posts: 921 Alachua, FL | the chain plates for the shrouds are aft of the forward beam...aren't they strong enough to hold the mast up by themselves? They probably would do the job if the spin halyard sheave was at the same point as the shroud tang. However, most cats have the halyard somewhat to way above this point. That causes the top part of the mast to go forward, inverting the mast, bending it the wrong way. When that happens, it may fail at the weakest point in it's column. The mainsail through the mainsheet keeps the mast bend positive and the bend in the lower portion is restrained by the mainsail cloth.
Jack Woehrle Hobie Wave #100, Tiger Shark III HCA-NA 5022-1 USSailing 654799E Alachua FL/Put-In-Bay | | | Re: Chute sailing
[Re: PTP]
#173075 03/27/09 01:07 PM 03/27/09 01:07 PM |
Joined: Jun 2001 Posts: 12,310 South Carolina Jake
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 12,310 South Carolina | Furthermore, your apparent wind is so far forward than sheeting in is actually the correct trim for the main.
by the same logic, why do we "blow" the rotation downwind? It seems excessive to allow 90 degree rotation when the apparent wind is still ahead. I don't go to 90 deg, but you get my point. What an echo in here! ;-) What they said. We rotate to 90 because although the apparent wind does move forward, it rarely comes much more forward than 70 degrees. It's still much more to the side than when you sail upwind. In light air, you will find it necessary to induce a bit of twist in the main - particularly so the bit of sail above the spinnaker can still breath as it is mostly unaffected by the redirection of air over the main. In moderate to heavy air, being sheeted hard IS proper trim and the additional mast rotation helps induce some extra fullness in the mainsail for a little more power.
Jake Kohl | | | Re: Chute sailing
[Re: Jake]
#173098 03/27/09 05:56 PM 03/27/09 05:56 PM | Scarecrow
Unregistered
| Scarecrow
Unregistered | When you're sailing upwind efficiency = speed = height so you set the mast rotation to maximise the lift to drag ratio. When you turn downwind, power becomes king and efficiency is less important. Rotating the mast will increase the available power. Also note that the main is eased a little its not cranked hard like upwind.
The good guys (Bundy etc) play the main downwind but you have to be very confident in what you're doing because we mere mortals have a tendancy to dump main when we get in trouble and as noted above dumping main can equal dumping mast. | | | Re: Chute sailing
[Re: ]
#173100 03/27/09 07:05 PM 03/27/09 07:05 PM |
Joined: Aug 2007 Posts: 70 ButchG
journeyman
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journeyman
Joined: Aug 2007
Posts: 70 | So, dump the downhaul, sheet in tight.
Can you move the traveller to optimize lift?
"There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order."
ButchG Prindle 19 w/Spi | | | Re: Chute sailing
[Re: ButchG]
#173101 03/27/09 07:10 PM 03/27/09 07:10 PM | Scarecrow
Unregistered
| Scarecrow
Unregistered | You can but its not as fast as playing main. Much safer though. | | | Re: Chute sailing
[Re: ]
#173102 03/27/09 07:18 PM 03/27/09 07:18 PM |
Joined: Aug 2007 Posts: 70 ButchG
journeyman
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journeyman
Joined: Aug 2007
Posts: 70 | Ok...next nube chute driver question......
How tight?
"There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order."
ButchG Prindle 19 w/Spi | | | Re: Chute sailing
[Re: ButchG]
#173108 03/27/09 08:55 PM 03/27/09 08:55 PM | Scarecrow
Unregistered
| Scarecrow
Unregistered | | | | Re: Chute sailing
[Re: ButchG]
#173111 03/27/09 09:27 PM 03/27/09 09:27 PM |
Joined: Jan 2005 Posts: 6,049 Sebring, Florida. Timbo
Carpal Tunnel
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Carpal Tunnel
Joined: Jan 2005
Posts: 6,049 Sebring, Florida. | Most do ease the traveler when going downwind, maybe a foot or two depending on wind strength and headings to marks. If you don't have leach tell tales, get some, then trim to those.
Blade F16 #777
| | | Re: Chute sailing
[Re: Timbo]
#173116 03/28/09 01:58 AM 03/28/09 01:58 AM | Scarecrow
Unregistered
| Scarecrow
Unregistered | Timbo, there are better sailors than me around and you might be one of them. But from a speed point of view I'd advise against dropping the traveller unless you're having trouble laying a mark.
Butch about a foot should be fine. Keep an eye on your rig and you'll soon get a feel for the correct setting with your rig. Timbo is right leach lines are very important for max performance.
Last edited by Scarecrow; 03/28/09 01:58 AM.
| | | Re: Chute sailing
[Re: Headhunter]
#173193 03/30/09 08:00 AM 03/30/09 08:00 AM | andrewscott
Unregistered
| andrewscott
Unregistered | While sailing aboard my buddy's mystere 5.5 he cranks in the main sheet while downwind then sets the chute, and keeps the main sheeted. He claims this is because the boat doesn't have a backstay and without a sheeted main we would demast. Apology accepted!!! ... don't ever question me again.... OR ELSE!!!! | | | Re: Chute sailing
[Re: ThunderMuffin]
#173205 03/30/09 08:39 AM 03/30/09 08:39 AM | andrewscott
Unregistered
| andrewscott
Unregistered | | | |
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