Good day to you sir,
The last 6 months I asked many off the same questions to myself that you also asked yourself. I have red everything that is to be red in regards to articles from A Gentry and I bought the latest version of C.A. Marchaj "Sail Performance". All in English so for a young Dutch guy a bit off an obstacle .... but I'm getting there.
I'm not addressing you in regards to "how or why sails work" but about the "Coriolis effect" and it’s part in Sailing tactics.
Nexus made instruments that can make the effect off wind gradient and wind shifts visible for us sailors. Very handy in regatta sailing. They claim that flowing air is influenced by the Coriolis effect.
With an overall tacking angle off lets say 75 degrees to apparent wind it can happen that on starboard tack the tacking angle is consistent 35 degrees and the port tack 40 degrees. Also on starboard tack (beam to port) sailors experience more need for twist high in the main then on the port tack.
I explain “beam to port” because here in the Netherlands we call a starboard tack a tack were the beam is on the starboard side and the wind is coming from port, I think in some other places they use it the other way around.
Could you give me your perspective on this question …… Why is the Coriolis effect influencing the wind gradient/direction?
Saturday, April 21, 2007
In the absence of any real sailing (by me) to write about recently, please indulge me by helping me to answer the question below that was emailed to me by one of my readers. It seems to me that this issue has all the potential to create as much confusion, misinformation and just plain bad science that I managed to stir up with my posts on How Sails Work early last year.