Theoretically, a boat could operate without using any fuel in much a manner. Using a giant kite, or sails, is no new technology, as wind power has been harnessed for over 4000 years. However, today such a system would not be ideal as the voyage time would be increased, and time is money. Also, this method would only be effecient form small vessels as there reaches a threshold where windpower becomes ineffective for large-scale vessels. Thus, using windpower to operate boats is only ideal for sailboats, as the tradeoff between time and fuel is not cost-effective in today’s economy.
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