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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

An unforgettable experience

A Trip with Dave on the Gemini is one of those gems that you feel very lucky to have found and will leave a beautiful, unforgettable experience on your mind. The price is incredibly affordable for the experience of being on a timeless sailboat cruising along the Barcelona coast. Dave, the captain, is full of interesting stories and makes you feel like this is the trip of your life. If you choose to do one thing while you’re in Barcelona, do this!
Anna L | Barcelona | 21 October 2018

Fantastic evening

We went on a sunset cruise with Dave (who is lovely) and had a great time. I enjoyed the sunshine and sunset while watching the coastline fade away and my boyfriend got to do some sailing, so everyone was happy!
FuzzAldrin | Newcastle upon Tyne, United Kingdom | 22 October 2015

Sailing fun

Had a great afternoon trip with Captain Dave - great host, and thoroughly enjoyable afternoon. Well worth a go!
Taylorgt1 | London, United Kingdom | 4 April 2018

Great Fun

4 of us booked the boat for 3 hours on a glorious Saturday afternoon. Dave was a great Skipper, letting us drink and play music while he took care of the sailing.
Dom S | | 11 July 2018

Catching the Sailing Bug!

I'd never been sailing, and had never really sought to do so through fears of a) getting wet and covered in salt water b) being shouted by some tyrannical captain who thought that everyone who gets on his boat is an utterly lost cause, ruining his day, and c) drowning. I was massively grateful then that my friends took me out with Dave on Gemini – changing my opinion on the subject forever, and instilling in me an addiction to sailing that I will carry to the grave.
Rackermagic | London, United Kingdom | 7 September 2011

Great way to see Barcelona

Fab way to get away from it all and see Barcelona from another perspective. Lovely historic boat. Kids are most welcome!
6Months062013 | Landsborough, Australia | 8 June 2018

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