Hi I watch your show every chance I get unfortunately it is not often enough. I love the way ya'll get down to the nitty gritty. I have one idea that you might have missed when it comes to sliding down a sail on a ship. The sail is not always in a 90 degree position. I always thought that they were tied to the ship at the bottom and when the wind blew into them it is more like a concave effect with 90 degrees at the top but more like 45 to 30 degrees angle at the bottom.