I think the other post I replied to got whacked before you got a chance to look at it.

If you hold the with the nock end facing you and the feathers "teist" to the right from back to front, that's a right helical. Vice versa for a left helical. Check out these sites for more info.

http://www.gatewayfeathers.com/nittygritty.htm

http://www.gatewayfeathers.com/faqs.htm

http://www.trueflightfeathers.com/guide.htm

http://www.trueflightfeathers.com/facts.htm