| Re: Internal hayards
[Re: waynemarlow]
#140951 04/22/08 12:11 PM 04/22/08 12:11 PM |
Joined: Feb 2004 Posts: 3,528 Looking for a Job, I got credi... scooby_simon Hull Flying, Snow Sliding.... |
Hull Flying, Snow Sliding....
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Posts: 3,528 Looking for a Job, I got credi... | Has anyone considered a way of making the spinnaker halyard internal and yet prevent water ingress when you inevitably go swimming ie have an internal pully system for raising the spinnaker and yet have some kind of valve / tube system to prevent water getting inside the mast. I want to try and clean up the mast a little ie internal downhaul, main uphaul in the luff track and spinnaker uphaul internal as well. <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" /> Hans Runs his Spi halyard down the forestay that makes the mast a bit cleaner; but you have a block up there. I considered an extra tube up the front of the mast (on the inside) to carry the Spi halyard get decied it might cause more problems than is solves.
F16 - GBR 553 - SOLD I also talk sport here | | | Re: Internal hayards
[Re: Stewart]
#140957 04/23/08 12:53 AM 04/23/08 12:53 AM |
Joined: Sep 2007 Posts: 571 Hamburg Smiths_Cat
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Posts: 571 Hamburg | Hi, I would think many times before drilling a largish hole into a carbon mast. As an engineer I would be more concerned about drilling holes in an alumium mast than CFRP (fatigue, crack propagation, wall thickness). On a CFRP mast you can also apply an extra layer of CFRP to locally reinforce it. That's not possible on an extruded mast. However, a single hole for a spi halyard should not be a problem for any mast. From all these ideas I like most the halyard back to the spi pole solution. Cheers, Klaus | | | Re: Internal hayards
[Re: Smiths_Cat]
#140958 04/23/08 03:49 AM 04/23/08 03:49 AM |
Joined: Jun 2001 Posts: 9,582 North-West Europe Wouter
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I would worry about the mast not being watertight and creating problems when righting ?
If an additiona tube is fitted inside the mast then the bending of the mast will be altered.
Wouter
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands
| | | Re: Internal hayards
[Re: waynemarlow]
#140961 04/23/08 12:02 PM 04/23/08 12:02 PM |
Joined: Nov 2003 Posts: 130 CA Glenn_Brown
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Posts: 130 CA | Has anyone considered a way of making the spinnaker halyard internal and yet prevent water ingress My ~1971 IYE Tornado mast has a AL oval box welded through the middle of the mast for the jib halyard. There are 2 sheaves in the box to redirect the jib halyard down the luff track. The same could be done for the spinny. I've run a spinny many times on this old mast, and it hasn't folded, so the idea is structurally sound, but it would be a poor idea for a spinny halyard, IMHO, due to mast bend causing the halyard to chafe against the main sail bolt rope. Randy Smyth addressed this on one of his boats (an 18HT, I think) by simply running the spinny halyard down to a block 12-18" forward of the main beam on the spinnaker pole. It was more exposed, simple, and it avoids creating turbulence on the low pressure side of the mast, where it is more costly. And then there is the 'down the forestay' approach. That's extra friction/wear and slow hoists/douses on a sloop rig. I'd only consider that on a unirig, and then there is the issue of extra hardware/distance/stretch/weight. It's not exactly KISS. --Glenn | | | Re: Internal hayards
[Re: ncik]
#140962 04/24/08 07:32 PM 04/24/08 07:32 PM |
Joined: Aug 2005 Posts: 2,921 Michigan PTP
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Posts: 2,921 Michigan | A small exit block with a rope in it would leak very little. It would leak enough to make a difference though if you are lightweight and need every ounce of help to get it back up sometimes. I think any water entry into the mast- esp through an opening as high as the spin halyard needs to be ... meaning it will be under water a lot fo the time when you are on your side- would have made me turtle a couple times. | | |
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