手持投射機

手持投射機或稱扭力弩（，），是一種利用扭转弹力发射抛射物的远射武器，主要部件由金屬所製，由亞歷山卓亞的希羅所設計。扭力弩相当于縮小到可供單兵使用的投射機，發射的弩箭比一般投射機小，通常由金屬製作。

參考
外部連結
*[https://web.archive.org/web/20141130052838/http://www.dl.ket.org/latin1/gallery/military/ballista.htm Article on ballista (shown), scorpio and cheiroballistra]
*[https://web.archive.org/web/20071117222842/http://198.144.2.125/Siege/Aitor/Reconstructing%20the%20Cheiroballistra.htm Reconstructing the cheiroballistra] (archive)
*[https://web.archive.org/web/20120717095508/http://www.thehurl.org/tiki-browse_image.php?galleryId=&imageId=595 Drawing] (archive)
*[https://web.archive.org/web/20060528205527/http://wildfiregames.com/0ad/page.php?p=1524 Greco-Roman artillery]