Stus-List Downwind sailing- Whisker pole length and height

David Knecht davidaknecht at gmail.com
Thu Mar 21 09:50:15 EDT 2019


I checked our rules and there is no limitation on whisker pole length in our region.  Dave


> On Mar 20, 2019, at 6:24 PM, Michael Brown via CnC-List <cnc-list at cnc-list.com> wrote:
> 
> I race handicapped by PHRF Lake Ontario which has no rating adjustment for whisker pole length.  I picked
> up a Forespar Line Control which goes out to 22', a fair bit for a 30' boat.
> 
> In light air, 4 knots TWS, setting the sails perpendicular to the wind works as well as anything else I have tried.
> That has the pole low at both ends, barely above the lifelines.
> 
> At a higher wind speed the common advise is to trim the genoa so the wind flows around it as opposed to
> it being a barn door. That will bring the pole back so it is more perpendicular to the wind, usually the
> inboard end up the mast a bit and the leach pointing into the wind. A bit like trimming a spinnaker.
> 
> Forespar has a diagram here:
> 
> https://www.forespar.com/pdf/F6.1-whisker-pole-brochure.pdf
> 
> Not having the leech bouncing around helps. For me that means adjusting the inboard end to get enough
> down pressure.
> 
> For a genoa with a 21' LP I will use all 22' of whisker pole in light air and about 18' in moderate air.
> In heavier air I switch to the spin pole which is 14.5' ( oversized and I take a penalty ). I can tell it is not optimal but works OK.
> 
> Michael Brown
> Windburn
> C&C 30-1
> 
> 
> Sent: Wednesday, March 20, 2019 12:42 PM 
> Cc: David Knecht <davidaknecht at gmail.com> 
> 
> 
> 
> We race non-spinnaker class and a few years ago I got an extendable whisker pole for the genoa.  I am unsure about optimal settings for pole height and length.   I suspect it is sometimes suboptimal because I have noticed some boats able to carry the genoa poled out at much closer angles than I have achieved.  Presumably the optimal pole angle is near perpendicular to the apparent wind.  It seems that extending the pole flattens the sail to some extent but I suspect it is more complicated than that.  Height I have no idea.  Any general rules of thumb? 
> 
> 
> 
> Related to this, the VMG chart I have from C&C  has optimal VMG downwind apparent angle of about 140-145? true.  Are those numbers +spinnaker, -spinnaker standard or -spinnaker wing on wing with whisker pole?  Thanks- Dave 
> 
>   
> 
> S/V Aries 
> 
> 1990 C&C 34+ 
> 
> New London, CT 
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> 
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> 

Dr. David Knecht
Professor of Molecular and Cell Biology
University of Connecticut	
91 N. Eagleville Rd.
Storrs, CT 06269-3125



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