I had an old chute cut to an asym - not perfect but it was a $200 test.
You really need a sprit to fly it. There is not really a good tack point that works well.
Selden and Forte now has a removable sprit that looks pretty cool. I have thought about it. You could also just add an anchor roller and fly it from there but getting it out away from the boat would be better.
http://www.seldenmast.com/download.cfm?download=7837&webnode_id=3014&filename=595-261-E.pdf http://www.defender.com/product.jsp?path=-1|118|319697|103585|312078|855335&id=1017978
I think for any real advantage you would want to fabricate a masthead sheeve and fly it from there, the fractional spinnaker halyard with an asym is not far from just reaching with the 163 class genoa.
I have thought about this a lot. I think the boat would be a PHRF smoker with a real Asym.
David
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