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Characteristics - speed


22 May 2019 | Last update: 28 Jun 2019

What makes Gemini fast? Primarily, 4 features.

1. The top speed of a sailboat is limited by friction with the water, so designers try to minimise the wetted surface area of the hull. In modern boats, they do that by making the hull broad but shallow. With Gemini, the design is for a narrow but relatively deep hull.

2. The narrow hull means Gemini leans over rather easily, compared to the stiffer behaviour of modern broad-hulled boats. To counteract that effect, Gemini has a heavy keel – 5 ½ tonnes of lead! This means that although she starts to lean over rather easily, she rapidly resists leaning over too far. Ultimately, this means she can carry more sail in stronger winds without leaning over excessively. This makes her fast in heavy weather – she can keep pushing hard through a gale.

3. A very tall rig, which means she can carry large sails. Gemini’s mast is as tall as modern boats of the same size. Gemini still has her original wooden mast. Contrary to what one might assume, wooden masts are pretty much as strong as aluminium masts. But they are much heavier. That extra weight up high is undesirable, so wooden masts are actually hollow. The mast is built in sections. They take a log, cut it lengthways down the middle, reverse the two halves and glue them back together, back to back, after hollowing out the middle. This construction method means that if the original log had any tendency to warp as it dries out, it is now trying to warp in opposite directions at the same time. So the construction holds the mast straight. Clever guys these shipwrights!

4. Finally, Gemini has a very distinctive canoe-shaped stern. This feature gives the hull an exceptionally streamlined shape, and is easily worth ¼ of a knot or so – a big speed boost. It’s also very seaworthy – it gives a very strong hull construction, and it cuts through the waves when they come from behind. But it is a very uncompromising design choice. Essentially it means you lose a whole cabin from the layout below. Gemini is a 41 foot boat on deck, but down below, she has about the same space as a modern 32 foot boat.

Read on to find out how the design brief was fulfilled:

What our customers say

Over 250 ★★★★★ reviews

TripAdvisor Certificate of Excellence & Hall of Fame 2015, 2016, 2017, 2018, 2019

Relaxing 3 hours away from the buzz

A very lovely afternoon with skipper Stefan and a welcome getaway from the hot city.
Alar I | Tartu, Estonia | 12 August 2015

Perfect romantic evening

I planned a private sunset sail with my partner as a surprise while we were on holidays in Barcelona. it was perfect! Dave was wonderful, the boat was perfect, it was lovely to sit, eating some cheese and watching the sun set and the lights go on around the town. A very special experience - highly recommended! Thank you again Dave for a memorable evening
Mima_Pope | Darwin, Australia | 21 October 2015

Light airs but great sail

My wife and I went for for an afternoon sail on Gemini with Dave last week and while the winds were light she ghosted along better than I expected.
Stephen B | | 10 November 2015

A wonderful evening with Captain Dave

Captain Dave and his boat Gemini were the perfect escape from the urban Barcelona. We booked an afternoon sail however he contacted us and advised we go a bit later to enjoy the sunset. It was beautiful. My love and I had the boat to ourselves and Captain Dave was a perfect balance of accommodating and knowledgeable, while at the same time leaving us to ourselves so we could soak in the experience.
braddog8 | Bozeman, Montana | 27 October 2018

Amazing Experience

Recently, Dave took my girlfriend and me on a sunset tour on his beautiful boat, Gemini. Before the trip, he communicated with us so well and had an extremely quick response time. He gave very clear directions on how to get to the boat, and we had no trouble finding it in Port Olympic. We brought drinks and ice, and he brought a cooler, which was so kind of him. He took us out on the Mediterranean, let us go for a swim, sailed along the coastline, and then took us back as the day became night. He even took a couple of pictures for me and my girlfriend during sunset. The trip was beautiful, we had calm water, and if I return to Barcelona, I will definitely re-book this sailing experience with Dave and Gemini. HIGHLY RECOMMENDED. Thanks Dave (:
cac275 | Hattiesburg, Mississippi | 21 June 2018

Different adventure on an old boat

What a nice sailing experience spending 4 hours in March on an old boat!
Sophiefrifri | Paris, France | 2 March 2014

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