Crossbow

=== diy ===
http://blog.modernmechanix.com/build-a-hunters-crossbow/
https://www.medievalcrossbow.info
https://crossbow.wikia.com/wiki/Steel_as_bow_material
https://crossbow.wikia.com/wiki/Bow_design
https://crossbow.wikia.com/wiki/Glassfiber_as_bow_material
=== 3 ===
http://www.google.co.za/search?sourceid=chrome&ie=UTF-8&q=electric+crossbow+youtugbe
http://www.youtube.com/watch?v=BSjCY2kGyfI
http://www.youtube.com/watch?v=0R9u2gjbw1w&feature=related
http://www.youtube.com/watch?v=xLMd_B5bJU8&feature=related
http://www.youtube.com/watch?v=0R9u2gjbw1w&feature=related Note design, can automate using electric pulley
http://www.youtube.com/watch?v=4DaD_HGBoWw&feature=related home made repeating cross bow
http://www.youtube.com/watch?v=Yrv3nmOcv5M&feature=related home made bolt actions with 3D cad files and three step video tutorial on building it.
=== compound bow build ===
https://www.youtube.com/watch?v=CxFIdRoqaFA scratch built compound bow
=== slingbow ===
https://www.youtube.com/watch?v=_ipvR9wPvWg
https://www.youtube.com/watch?v=KRCD0r58Sqs
https://www.youtube.com/watch?v=ZYxhTf9ticM 483fts! 529 km / h! Powerful Slingshot Simple Trigger Homemade Slingshot steel ball black pipe
https://www.youtube.com/watch?v=9IBAHE7e58g How to make hand crossbow from scrap metal and spring
=== steel ball ===
http://shoottech.com/Page/Web/AR480MARKII
=== links ===
https://www.youtube.com/watch?v=LFfDndaCMLo latest bows 2023 
https://crossbow.fandom.com/wiki/Category:Practical 
physics
Category:Sasecurity
Category:Guns
Category:Crossbows