Something Doesn't Jibe: Question from a Reader about Sailing in Horatio Hornblower

Romancing the Tome reader Mike writes in: "Anyone know who did the actual sailing in the filming of this series? I'm curious why sails were often slack and flapping, when they could have as easily been trimmed."

If anyone knows the answer, please leave it in the comments. Thanks in advance for your help! --Kim

P.S. Also, A&E, if you're reading this: Check out our petition and Bring back Horatio Hornblower!