"It is a common practice to fit fletchings at an angle to the sh

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回答: 弓箭轉不轉,視頻說了算!coolwin2020-01-17 10:39:35

http://www.tap46home.plus.com/mechanics/fspin.htm

"It is a common practice to fit fletchings at an angle to the shaft or use fletchings which have a built in angle to cause the arrow to spin in flight around the shaft axis. Why do this and how does it work?"

 

SPINNING ARROWS

It is a common practice to fit fletchings at an angle to the shaft or use fletchings which have a built in angle to cause the arrow to spin in flight around the shaft axis. Why do this and how does it work?

An individual arrow can have a bias to curve in flight. This may result from the arrow not being perfectly symmetrical e.g. slightly bent, or from having a non symmetrical pile e.g. a broadhead. When the arrow flies, any asymmetry will result in a torque on the arrow increasing the offset angle and resulting in a curved flight path. By making the arrow spin around its axis the curved flight path is converted into a helical path as the 'bias' is rotated in all directions. This approach works equally well with all arrows, all with different biases and tightens the arrow groups. The diagram illustrates the effect on arrow flight path of arrow spinning.

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希望你能看得懂E文。 -coolwin- 給 coolwin 發送悄悄話 coolwin 的博客首頁 coolwin 的個人群組 (0 bytes) () 01/17/2020 postreply 10:53:38

你離開中國的軍工行業,實乃國之大幸! -coolwin- 給 coolwin 發送悄悄話 coolwin 的博客首頁 coolwin 的個人群組 (0 bytes) () 01/17/2020 postreply 10:54:37

那未必,不然我就沒錢雇人了 -xsing- 給 xsing 發送悄悄話 xsing 的個人群組 (0 bytes) () 01/17/2020 postreply 10:57:04

你們這號人是不是拿同一個腳本,念同一段台詞。台灣騙子不都是這樣騙嗎。 -bluesky231- 給 bluesky231 發送悄悄話 bluesky231 的個人群組 (0 bytes) () 01/17/2020 postreply 11:46:32

現在比賽用的弓,因為新材料彈力大增。有專門配旋轉翼的。你參加過射箭活動嗎? -xsing- 給 xsing 發送悄悄話 xsing 的個人群組 (0 bytes) () 01/17/2020 postreply 10:54:56

力沒變,材料輕,速度快了。弓是和箭杆同時加速的。 -BeyondWind- 給 BeyondWind 發送悄悄話 BeyondWind 的個人群組 (0 bytes) () 01/17/2020 postreply 12:43:39

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