Slainte97

J97 Tuning Hints

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On 8/22/2018 at 12:14 AM, Slainte97 said:

Just started racing a J97, looking for any tuning or performance hints or ideas. 

We are in the same situation and also looking for tips. Downwind seems to be the easy part, upwind is a bit twitchy and the groove area is narrow. That said, basic text book trimming seems to be mostly ok.

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That said, do you have pica or instructions for a good jib inhauler arrangement for the 97? Ours is not good as it pulls the jib sheet forward towards the mast foot. Would be nice with some J/97 specific ideas before I start drilling.

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I'd reach out to Paul Heys, owner of Key Yachting in the UK.  There's a lot more J/97 racing going on over there, and he is one of the main European J/Dealers.  I suspect they have a ton of info/contacts that can help you...

 

https://www.keyyachting.com/contact-us/

 

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have you loaded the polars yet in your system? that should at least give you an idea on the target angles and speed.  I agree to call Paul Heys after this, for more tips&tricks on how to make the boat go fast. 

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Couple of big batteries in front of the mast step to trim the bow down

Race with 7 minimum, sheet the main hard and hike like hell.

Fly the A sail tack high downwind and heel the whole lot to weather, 170twa is your target angle

Practice sailing wing and wing downwind

 

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13 hours ago, JL92S said:

Couple of big batteries in front of the mast step to trim the bow down

Race with 7 minimum, sheet the main hard and hike like hell.

Fly the A sail tack high downwind and heel the whole lot to weather, 170twa is your target angle

Practice sailing wing and wing downwind

 

Interesting with the batteries, is this actually something practiced on J/97s? 

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On 9/7/2018 at 5:23 PM, JL92S said:

It has been known to make them faster, they don’t even need wiring in

Supposedly making the waterline longer then for upwind and reaching? The J/97 bow indeed floats quite high:

 

j97-evolution-2.jpg

 

1_4.jpg

 

 

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On 9/5/2018 at 7:19 AM, Nubben said:

Interesting with the batteries, is this actually something practiced on J/97s? 

 

On 9/7/2018 at 10:23 AM, JL92S said:

It has been known to make them faster, they don’t even need wiring in

Does anyone know if you are adding two more batteries infront of the mast or is it best to move the existing batteries infront of the mast. Mine are a little behind the mast now. 

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Considering the optimal shorthanded setup for a J97. To start with, I hate changing headsails. 

Currently we have a reefable full size jib, specified to cope with 30kts of wind if necessary. Very nice sail.

In addition we have some older North M/H jib and a true heavy jib, with 1,5m short luff.

Downwind we have North A2 and masthead kite which is about 85% of the A2. Uncertain what the correct classification is of this one.

Currently I am considering what to add for the optimal shorthanded setup for distance sailing in the Baltic sea, e.g. mostly light winds. And again, I hate changing sails so I prefer sails which have wider usage possibilities.  

Options:

1. J0 from sprit on a furler with an additional clew patch. Could go upwind and reach, but is not optimal for twa 70-100 especially if designed for going upwind?

2. C0 from sprit on a furler. Not for upwind but better in really light and is better on open reaches?

Other ideas?

What would you prefer and why?

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I don't think you can get enough tension on the sprit for a code 0 to effective in higher angles. consider flying it from the bow instead

 

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If sailing in the light airs why the small A2? The J0 idea looks good although like jmod said sprit tension might be an issue, consider an over specced bobstay and overspec all the bits of rope related to the J0! Other options include fitting a small fixed bowsprit just for the J0 or to use a collar round the bowsprit similar to that used by @Blur, hopefully he can chime in on his setup.

I’m guessing your jib’s reef is a slab reef and the jib is on hanks? If so that’s a decent headsail setup.

I always felt the mainsail on the J97 was slightly small so would consider a larger main for light airs. If the backstay is a big issue then a longer boom would be my next step.

 

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