Catamaran with Magnus Effect Rotor Sail

Flettner rotor is built from thin 150g/sqm woven glassfiber composite.
The composite is wrapped on circular high density foam discs that are glued on the central axel that rotate about the loadbearing stationary vertical axel. The whole rotor is driven by a brushless direct current motor (BLDC) via belt. It is all mounted on a small catamaran hull.
The same rotor technology is used by Norse Power, that makes the Norse Rotor Sail. This is mounted on several large freight ships and passenger ships
Maersk Pelican - www.norsepower...
M/W Copenhaven owned by Scandlines www.scandlines...
The M/W Copenhagen is now called a 'hybrid ferry', but in fact the accumulated emission savings are 4-5% and up to 20% in optimal wind conditions (which is probably not both ways across the route same day) [source: shipandbunker....]

[@VRBroadcasting]

“That’s got to be the greatest Pirate I’ve ever seen.”

[@samuelclemons6821]

It would be interesting to compare performance using the same power applied to a conventional propeller.

[@stigantonnielsen]

This is comparable to motor assisted sailing / sail assisted motoring, so the rotor sail is just converting the wind energy like a sail. Therefore a 'conventional propeller' would not stand a chance energy-wise to this rotor. But sure, still it would be interesting to get a better idea of the efficiency of the rotor and have a factor of gain, but that would highly depend on the wind energy in the system. Normally one would say 20% goes to driving the rotor (where 100% is the forward acceleration of the boat), so a factor 5 maybe ?

[@stallion63m35]

@@stigantonnielsen How abt comparing the same electric power to a fan propeller like those on airboats?

[@ezrarichardson279]

With the same motor with a properly sized propeller it would hardly move at all. It just wouldn’t have enough power to push it. All the motor has to do in the case in this video is to overcome the (some what low) inertia of the flettner rotor which doesn’t require much power at all. The boat is then pushed forward by the lift generated at a 90 degree angle from the wind. So in short, if there’s wind, a rotor sail would require a lot less power to move the boat than a propeller.

[@akcarlos]

@@ezrarichardson279 yes , however I think its not clear in this video that the power comes from the wind for people who are unaware of the Magnus effect

[@gustidellacasa4882]

@@ezrarichardson279 Which shows that it´s an excellent complement for cargo transport ship.

[@nicholasfredro6217]

That's is amazing ..The engineering principles are truly a wonder..The science is remarkable...

[@hswing11]

DUMB AND DUMMER

[@nileshyalkar1764]

non electric vertical axis wind turbine coupled with gears and belts+ conventional or voith propellor would be interesting

[@EINechterKARL]

Very nice project.

[@sailingoctopus1]

Would t The effect would be the same if it was a rigid cylindical structure, with just the skin of the cylinder rotating. With this design, it seems as if the motor bearings are taking a considerable load, as they have to bear the full weight of the structure, plus any wind loading. You could have, say, four rigid cylindrical structures, one at each of the four corners of the catamaran, connected together at the top, to increase structural rigidity. The skin could be made of fabric and would be rotated around the rigid cylindrical structure, perhaps by having toothed belts sown at specific intervals on the inside of the skin so the skin could be driven round cylinder by motor-driven cogs.

[@sandrasch2337]

wow-This shouldt be take off in the guiness-records-book!

[@nerdibern3895]

What is the formula for the thrust generated?

[@arenorhagen6805]

Nice! What is the power input of the rotor? Is greater rotor speed, greater boat speed? Do you reach a limit?

[@CAMacKenzie]

I was curious about that, too. Also, does rotor speed vary with wind speed or direction? How close to the wind will it sail? If you had 2 rotors, driven individually, you could use them for steering.

[@jackp492]

I was reading the rpm doesn’t need to be that high, could you get by on pedal power, What kw was the motor?

[@abdullahbambang2917]

Mm.., at first I thought it was an electric generator. And if it is a ship's propulsion device, I think regular boat sails are still better. We only need to replace the forming material to make it easier to carry and more efficient. 😊

[@ljhm6816]

Nice to see this technology in use, ekranoplan next? With a rotor?

[@Clovis321]

Dúvidas, se puder esponder: 1 - O sistema funciona com vento vindo de toda direção, inclusive vento contra? 2 - não teria como acioná-lo com uma "turbina eólica" no topo acionando o eixo dele? 3 - é mais eficiente que a vela tradicional? mas a dúvida maior é se funciona em qualquer situação de vento.

[@joseferraz-sq3tm]

Mais eficiente com vento a 90⁰. Pode derivar e seguir em z tal e qual um barco à vela convencional.

[@burkhardnilius691]

What´s the length and diameter from the rotor?

[@undisturbednaturalworldd3102]

imponerende - tak fordi i gider gøre det (tror faktisk i/du ikke ka lade være) det er så positivt , måske ka den indstilling også føre til "coronaens" #undergang/fald. wind/rock/mountbatten

[@stigantonnielsen]

:) tak, det var dejligt at høre. Ja, vi kan slet ikke lade være at bygge skøre ting der skal testes :D

[@ВасилийВасилий-б9у]

Супер

[@wabash1581]

Nice

[@woutervanwijk4369]

Clockvise and counterclockvise?

[@MrPjedsted]

Both ways depending on the wind direction.

[@woutervanwijk4369]

@@MrPjedsted you mean clockWise?

[@dnomyarnostaw]

@@woutervanwijk4369 He was referring to CCV, "Cherman for KlokVise"

[@woutervanwijk4369]

@@dnomyarnostaw Cherman? I'm surrounded by illiterates!!! Help!!!

[@dnomyarnostaw]

@@woutervanwijk4369 So what else does CV and CCV stand for : -)

[@tomnothr1424]

Interesting

[@АлексейА-о9т]

Была попытка сделать самолёт на эффекте Магнуса. Это первая версия. Вторая и третья версии кратковременно отрывались от земли. Сейчас анализирую ошибки и собираю четвёртую версию. kzbin.info/www/bejne/ioSpqXeKgcmHsJo&pp=ygUi0YDQvtGC0L7RgNC_0LvQsNC9IChtYWdudXMgZWZmZWN0KQ%3D%3D

[@tihomirculjak7492]

Es ist besser, ein niedriges und breites Windrad auf den Katamaran zu setzen. vvv.joutube.com/vač?v=cVU9a1N2BSU

[@rifkyramadhan6889]

Nice boat with rotor sail

[@dnomyarnostaw]

A larger diameter is called for for decent results, from the calculations for power on spinning cylinder. .7 of a metre Diameter would make a huge difference.

[@wernerwilfrieddittmar6323]

Respekt- - fantastisch gut

[@АлексейА-о9т]

Какова мощность двигателя вращающего ротор? Удалось ли испытать катамаран при более сильном ветре?

[@nativenomad7021]

Fantaskisk!

[@bobododoo3925]

Hi. I'm looking for an answer. the force arising from rotation tends to overturn the sail, just as it happens with a conventional sail, or is it directed strictly horizontally?

[@MrBcummings8521]

Why does he keep using the paddle to turn. Are the tillers not sufficient.

[@stigantonnielsen]

The hull is rather long and its all very light weight, so inertia is not sufficient to turn with the bow towards the wind. It was possible through to turn with the stern to the wind, bow downwind, without using the paddle. Tillers / rudder worked well for adjusting heading relative to the wind while sailing.

[@hereintranzit]

With classic sails and a windvane pilot you can circumnavigate the world using zero electricity and fuel, but with this design you’re still depending on electricity and/or internal combustion engines.

[@dnomyarnostaw]

@@stigantonnielsen In other words, the rig was insufficiently able to Tack into the wind. Mulihulls are renowned for that, but the undersize rotor wouldn't have helped.

[@graygull771]

フネに対してセールが小さすぎるよ。 確か、クストー船長が「アルキオネ」と言う結構大きい船を作って、日本にも寄港したと思ったな。

[@dnomyarnostaw]

The Alcyone was not a Rotor Ship

[@graygull771]

@@dnomyarnostaw うん、原理を確認した。さあ、どっちが効率的だろうね？小さい場合には有効だが、規模が大きくなるとマスト全体を回すと効率的に不利じゃないか？

[@dnomyarnostaw]

@@graygull771 Rotors can scale output by altering the Revolutions. "TurboSails" can only be as powerful as the current wind conditions.