Wishbone Boom Versus Conventional Boom

Bill, do you have a pic or diagram of the flow around an uni rig that shows the twist characteristics? A full foot. I was so close, yet so far....again.....

Paul

 

Paul:
No flow diagrams but here is a pic of the Wyliecat 17 on the wind.

 

Bill, that really looks right.

Paul

 

What is "inhaul" on a windsurfer?

Here are some vang/outhaul that don't require any tracks.
No topping either - but separate mast bend control sounds nice!

 

Sigurd, I think you're asking Bill, but FWIW, mine all went to the end of the boom. More leverage there.

Paul

 

Sigurd:
In-haul on a windsurfer really doesn't have much meaning anymore. Originally, it was the line used for lashing the boom to the mast. I use the term to refer to the opposite of outhaul where a sail with a full batten in the foot can be artificially shaped by compressing the batten against the mast. We do this on the Wyliecat 17 and 30 by moving the tack attachment aft some distance from the mast and 'in-hauling' it to develop shape (or remove it) when desired. On the Laser Turbo we are doing it at the clew because the sail has camber inducers.

 

Laser Turbo is wide sleeve, 4 camber inducers on std. mast & boom.
Wyliecat 30 sail is on std mast and rigging.
Bill Hansen
Hansen Design
Recent Projects:
Wyliecat 30
Wyliecat 17
Wylie 'Taxi Dancer'
Hoot Dinghy
Laser Turbo
Antrim Wing Dinghy
Cal-20+ Unirig

 

I was wondering, on the camber-induced sails, do they neceserily "flopp" over when they tack, like the full-battened sails, or can they become flat when they have zero AoA?
I am trying to figure out how to make a softsail transition smoothly through zero AoA, with little dead zone between positive and negative lift.

 

Yes, the cambered sails "flopp." It can be reduced by outhauling the sail until flat (if possible) before tacking or jibing but why worry about it?

 

tail elevator/rudder. I figure it can be shifted through neutral smoothly if outhaul (camber) is connected to sheet (AoA) somehow.

 

Bill,

Is that a stock Laser Mast?

How much sq ft?

What is the performance difference to the stock sail?

Am I off topic now?

Paul

 

Some version of a Hoyt boom would probably accomplish what you are after.

 

Paul:
Answers:
Yes. Stock rig with class legal controls.
100 sq-ft.
Much better. More responsive to sheeting, easier to control, extends through lulls or turbulent wind better and according to the test crew, 'a whole new gear' is found.
Yes, to some extent.

 

Bill, better, tighter upwind, more heighth?

Paul

 

We are still in the testing stage with several skilled sailors (lightweight junior sailor and heavyweight adult.) No comparable boat-on-boat so the results are subjective but very positive on all points of sail and conditions (so far.) Capsizing tests are also part of the testing. I think if you look at the pic, there is no doubt that it is an improvement.