Chicken of the sea wrote:
Fellows,
If we take the video for more than what it is, that being a fun example of how fast an Island can go downwind in good winds, we might discover that there is more than meets the casual eye here. To wit, there is a reason beyond that of mere waterline length or raw sail area, why the tandem blew past the AI.
A careful viewer of the video will note, for just a brief moment, that from the stern of the tandem's port ama, 2 lines appear leading towards...well it's not exactly clear towards what. However, anyone who has watched some of Mr. Spook's excellent videos showing his modifications to his boats, will realize that those lines are meant to attach to the clew of his mainsail and act as a barber-hauler, pulling the sail out and away from the hull, thus increasing its effective sail area on a broad reach or a run.
Mr. Chekika will note that the AI that Mr. Spook passes, has his mainsheet pulling directly back to the stern of his boat and, lacking the advantage of a barber-hauler, is handily passed by Mr. Spook. And very unsportingly too, I might add.
Mr. Chekika will also note that he was presented with a live example of just such a phenomenon not 3 weeks ago when he, I and several others were sailing together in the Eveglades, specifically on a breezy 15-18 knot broad reach from Highland Beach to Northwest Cape. At that time, he will remember, I, in a humble AI2, passed not only his AI and all the other AIs, but also both tandems, including a tandem with only one person aboard. He will further note that I passed them all whilst reefed, as in my inexperience, I became alarmed that the bow was repeatedly diving into the wave in front of me and I had yet to learn that this was a mere 'feature' rather than a serious problem.
And while we can ascribe my boat's superior performance to my extraordinary sailing skills, truth be known, it was really due to my having the only proper barber-hauler amongst the fleet. And this due to my having watched Mr. Spook's videos and blatantly copied him.
The lesson here being that either boat, be it tandem or AI, will easily pass the other, if the passing boat possesses the advantage of a barber-hauler.
Let's put this into perspective. I was also there on the day this video was taken.
1. Spook did not have his barber-hauler attached when this video was taken.
2. He is actually on a small wave near the entrance of a bar, hence the vast pick -up of speed. The AI has slowed due to the fact that he is no longer on a wave and has his sail in tighter, losing sail power on the downwind run.
3. When Spook first got his TI, he was slower than our AI2's. He now has it tuned in perfectly and going faster than our AI2's, particularly on the downwind runs.
The day was an absolute blast with very strong winds in a sheltered passage. Hell of a lot of fun pushing the boats to their limits.