【見字「遊」水】帆船逆風行靠三寶



香港遊艇會, 見字遊水, 帆船, 體路冷知識, 體路專欄
(Photo Credit:香港遊艇會)

【體路冷知識】為推廣帆船運動,將這項老少咸宜的水上運動推廣給市民大眾,香港遊艇會特別於《體路》,推出一系列「運動冷知識」,將相關於帆船運動、卻又可能比較少人知曉的知識,以趣味方式和大家分享。《見字「遊」水》欄目逢周三會與大家見面,記得留意!

帆船為何可以逆風行駛呢?當空氣流經類似機翼的弧形帆面時,會產生一垂直帆面向外側的作用力,不過這個作用力會使船身產生側移,帆船在船身下方還有一個可升降的定水板,可藉由水的作用力來阻止船身產生側移,即抵消了側移的作用力,就可以讓船逆風前進。不過帆船以風力推動航行時,最多只可以駛向與風向成45度夾角的方向,因此如果要航行逆風航行,需要多次轉換方向以「Z 型」航行。

Share via
Copy link
Powered by Social Snap

Fatal error: Uncaught wfWAFStorageFileException: Unable to verify temporary file contents for atomic writing. in /var/www/html/sportsroad.dyndns.org/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php:52 Stack trace: #0 /var/www/html/sportsroad.dyndns.org/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php(659): wfWAFStorageFile::atomicFilePutContents() #1 [internal function]: wfWAFStorageFile->saveConfig() #2 {main} thrown in /var/www/html/sportsroad.dyndns.org/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php on line 52

Warning: Unknown: write failed: No space left on device (28) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/sessions) in Unknown on line 0