Dinghy ride to the beach in the Berry islands. Bahamas

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This video shot by www.droneproject.eu shows tight action at a windward mark during the RC44 Cup in Marstrand, Sweden the first weekend of July 2021. The lead boat RUS 21 shows great down-speed boat handling. She does several quick tacks in succession and luffs around the windward mark, all the while staying in front of the fleet. The question is: did RUS 21 pull off a slick move to round the windward mark first or should she get the flick for breaking a rule. Things to think about: When RUS 10 originally tacked from port to starboard, was she in the zone? Does 18.3 apply RUS 21 got room from RUS 10, was RUS 21 entitled to luff after rounding the mark. Watch the video and draw your own conclusions. The answer is on the UK Sailmakers.com site in the Rules Quiz section. V

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This video was uploaded from an Android phone.

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UK Sailmakers uses very powerful 3-D CAD/CAM software for sail design, which create virtual 3-D molds that can be digitally sliced into two-dimensional panels that when joined back together re-create a full-size version of the designed mold. Thanks to powerful 3-D graphic renderings, designers can see how sail fit around the spreaders and shrouds as well as make sure the clew height and sheeting angles are right. They can also analyze how a main and genoa work together to make sure the boat stays balanced. What we are looking for is a sailplan and sail shapes that put the maximum driving force in precisely the right place to produce a perfectly balanced boat – and with the least amount of drag. Pat Considine, UK Sailmakers’ chief designer, goes a step further and uses Fluid Structural Interaction software, called FSI for short, as a virtual wind tunnel for refining sail designs and sail construction. FSI calculations are used to test proposed designs and cloth choices to make sure they are not built too strong (too heavy) or too weak (too light) for their expected loads. The FSI calculations will predict whether a design and construction will keep its shape properly as the rig bends, halyards are tightened and sheets are trimmed. Shown rotating in this video are two renderings of a Tripp 47 mainsail design. The side-by-side comparison shows the sail with no backstay tension and with max backstay trim. The FSI software allows Pat to rotate the two designs together to study their shape from any angle. In this case, Pat needed to be sure the draft would not move too far aft as the sail was flattened; likewise, he had to make sure the draft was not too far forward when the backstay was eased completely. The FSI program has made extremely accurate predictions of how specific sail designs will perform once made and trimmed in a variety of wind speeds. These tests ensure sails will meet the performance needs right out of the bag.

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You can learn so much by taking whatever camera is available to you. Practice your buoyancy, composition, and editing. Then, when you're ready, you can move on to a more advanced setup. I recommend lights as the first big investment. Underwater photography and videography is an expensive hobby, so especially if you're on a budget, you want to be practical about your equipment decisions. Tell me what equipment you're working with! I am still figuring out what kind of setup I want to grow into, so it would be cool to hear what you're using and what you like/dislike about it. Watch the full video of this dive on my channel.

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