Moving J/109 speed sensor to centerline

Mulligan

Member
170
57
San Pedro
This is how I did several J-105 speedo’s. Cut a section of stringer out. Made a Fiberglass tube, about 5” diameter. Glassed it in. Bored hole, rebated core, filled with epoxy. Taped a stir stick at hull surface. Removed flange from speedo tube. Masked everything, buttered it up with thickened epoxy, and set it in. Next morning, I sanded the outside tube edges flush. Instantly cured tack to tack error!

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Squalamax

Super Anarchist
2,561
88
As an amateur team, with limited time for training, we always want to sail the boat as close to 100% as possible. In one-design you get really good references sailing against similar boats, but with a J/109 or J/111 you spend most of your time sailing on your own.

For this, you need calibrated instruments that work.

The really big benefit is that when PolarBSP% = 100% you can focus on what's really important; strategy and tactics. And when it's 90% you can put in all your effort for 2 minutes to get that fixed.

When I coach new teams, I see them struggling with questions like "is this fast", "are there current", "has the wind gone right", "should we go to J3", "is this a good angle downwind", etc etc. ALL those questions have a definitive answer so why speculate and argue.

So I see spending a weekend to get the speedo mounted properly is a small investment to be able to answer hundreds of important questions during the season.
Its different here in the US. Plenty of 109 or 111 events to sail OD in. I see your point though.
 




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