Proper mast rake - Page 2 - SailNet Community

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  #11  
Old 06-28-2006
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My j/24 racing buddy in annapolis just reduced his rake slightly, which reduces tension on the headstay. This in turn allowed his jib to have a better shape, and it must have worked - he won the 2nd race saturday.

Mike
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Old 06-28-2006
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I used 6 degrees of rake on mine. She seems to like it.
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Both mast bend and mast rake will tighten up the headstay and make the sail more powerful, by allowing it to have a deeper draft.
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Old 06-28-2006
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For what it is worth, depending on the design of the boat neither mastbend nor rake automatically means greater forestay tension. Prebend can be induced into a spar with high amounts of shroud tension, or with babystay tension on a masthead rig, which in terms slightly shortens the length of the mast loosening the forestay. By the same token, a mast can be further raked by loosening the forestay.

Jeff
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Quote:
Originally Posted by infonote
On boats like H-Boats, having the mast lean forward is done. I agree that it improves performance.
How does it improve performance? Where is the mast in relation to the keel?
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Quote:
Originally Posted by Jeff_H
Historically, boats of that era were typically designed with a 1/4" of rake per foot, and then tuned to provide a balanced helm. 5.5 meter class boats of that era (which is what the Sabre was) typically began life without a huge amount of rake or bend in lighter going and a bit more in heavier winds which seems counter intuitive but more backstay pressure meant more headstay pressure.



Jeff
7/8 rig Jeff...with this type of rig you need either a Jumper strut, swept back spreaders, or running backstays only then can you achieve proper headstay tension. Otherwise as soon as you start to get proper headstay tension on a Sabre, without a jumper strut or Runners you start to bow the mast forward just above the lowers.
Try to take it back with the backstay and you induce lots of light air killing, flattening, in the upper part of the mast.
We're still learning, but I'm leaning towards 6-8" Rake 1-3" bend and runners to take the sag out off the head stay when the wind pipes up.

Last edited by noscreenname; 06-28-2006 at 10:49 PM.
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JeffH... I probably should have said can, not will. Depending on the design of the boat.
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Quote:
Originally Posted by sailingdog
JeffH... I probably should have said can, not will. Depending on the design of the boat.
Exactly!.... back stay tension doesnt always mean head stay tension especially on a 7/8 rig.

S/D....."Both mast bend and mast rake will tighten up the head stay and make the sail more powerful, by allowing it to have a deeper draft." .... This comment doesn't make much sense in my case.

Last edited by noscreenname; 06-28-2006 at 11:00 PM.
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Old 06-29-2006
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Question Mast rake

Jeff,
What mast rake would you recommend for a Ranger 37 ? I intend to try to race it next season when I learn a bit more about how to handle the spinnaker. but this season will be learning , learning, & more learning. Thanks.
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