America’s Cup
How amazing is the wind power?！
And how amazing is the current technology?！
America’s Cup is the best way to know that.
The previous 34th America’s Cup was dramatic and the competition boat was a big boat called AC72, so I will explain this Oracle team mainly.
| Last year (2017), the 35th America’s Cup was held by New Zealand, but what I thought was the most amazing was the Catamaran yacht called AC72 of the 34th America’s Cup. Sail height is 40m. The boat is 72ft long. The weight is 7 tons. The catamaran yacht runs like a fly, and the speed exceeds the wind speed and reaches 40 knots (about 75 km / h). The boat is lifted by an underwater foil (wing) of only about 1M in length. I am attracted to what kind of technology is included. |
| This is a tuning scene of the American Oracle team. Olympic sailing medalists are active across the border as an American Oracle team. |
| The 34th America’s Cup final race was held in September 2013 in San Francisco Bay. The final was a confrontation between the defending US and the challenging New Zealand. The American oracle team that had been overwhelmingly drained by New Zealand at 1: 8 was able to make up for the race until 8: 8, and the final race. It ’s a moving scene. |
| Other Video |
Below are the details of each race of the 34th America’s Cup. The winner is the one who scored 9 points. America vs New Zealand.
New Zealand will go up to 8: 1 first, and if it takes one more race, it will go to victory, but then the United States finally caught up to 8: 8, and the winner was decided in the final race on September 25th.*)Suffix show comments below
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Open in new tab 1 Oracle’s victories in races 4 and 8 did not award points, due to the penalty imposed by the jury.
2 Oracle used their postponement card after race 5, canceling the second race scheduled for September 10.
3 With Team New Zealand leading during the third leg, the second race on September 14 was abandoned by the race committee due to the wind exceeding the allowed maximum.
4 Both races on September 17, and the second races on both September 18 and September 19, were postponed due to the wind exceeding the allowed maximum beyond a reasonable start time.
5 With Team New Zealand well ahead in light winds near the end of the fourth leg, the first race on September 20 was abandoned by the race committee due to the race exceeding the 40-minute time limit.
6 Both races on September 21 were postponed by the race committee due to the wind direction not permitting a fair laying of the race course.
7 Due to the late start of race 16, a second race was not sailed on September 23 due to the 2:40pm cutoff time for racing.
Huh? How is it running?
A yacht that can run faster than the wind.
The hull is floated with a foil (hydrofoil) below the surface of the water, minimizing the water resistance.
↑ The AC72 sail consists of two wing sails with the wings of the airplane in the vertical direction and a jib sail in the bow direction of the yacht. By controlling the shape of multiple sails, the lift (force to move forward) is controlled to the maximum.
↑ Increasing the speed of the yacht will exert an upward force on the underwater foil (wings), which will be about 7 tons, lifting the yacht completely above the surface. And the upward force of the foil, the weight of the yacht, and the wind force balance, and it will slide stably.
↑ The ladder (rudder) has horizontal wings so that it makes whipping ( head of the yacht turning up and down ) stable. When the bow is tilted downward, the force to cause the horizontal wing to act oppositely works, and conversely, when the bow rises, the force to lower it works.
↑ AC72 can produce faster speed than wind speed. If you receive wind from behind, you can not exceed the wind speed, but by moving in an oblique direction, maximum lift is obtained and it is possible to exceed the wind speed. In the final race of the 34th America’s Cup, the wind speed was about 17 knots (30 km / h), but the speed of the yacht heading leeward was 40 knots (75 km / h). The speed is more than twice the wind speed.
Links Below (Japanese )
【Illustration 】Advanced technology of “F1 in the sea” : Flying Yacht
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