new mini crossbow with repeating shooting style from china
http://www.youtube.com/watch?v=Ve8g-q7i_JU
http://www.youtube.com/watch?v=g081n64bFQ0
http://www.youtube.com/watch?v=WS5vJ1nm7Hw


The Chinese repeating crossbow
new modified style:
size：14.4(L)*18(W)*10.5(H)cm
pack size：30.5(L)*22.5(W)*17.3(H)cm

The Chinese repeating crossbow (Chinese: 諸葛弩; pinyin: Zhūgě nǔ; Wade-Giles: Chu-ke nu; literally "Zhuge crossbow"; sometimes misspelled as Chu-ko-nu) is a device with a simple design.
It is commonly believed to have been invented by the Chinese strategist Zhuge Liang (226-481 A.D.) of the Three Kingdoms period. its widespread use as a handheld defensive weapon in the defense of fortifications made this a vital weapon during a siege.
However, this belief is false as the earliest repeating crossbows (found in Tomb 47 of Qinjiazui, Hubei province) were dated to the 4th century BC.[1] Zhuge Liang improved the design of the repeating crossbow, and made a version which shot two to three bolts at once and was used in massed formations, and for this reason, it was named after him. This craft( zhuge nu) is manufactured quaintly by  modern design  with brass gilding  according to zhuge repeating crossbow theory. It works with 10 toothpick arrows repeating shooting although its”palm size.. Allegedly the ancient Chinese emperors owned it for self-defense.

that is model for  crafts ,not real weapon with much power.

push the end and pull back,again and again,pls check out the video.

  You could up the power by using pulleys or you could motorize it, that would allow for a heavier draw weight.