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I built some ones catapult that shot marbles but i have made it to shoot knex wheels, i have also added a firing mechanism on it . I ...
K'nex Ball Machine Lift: Giant Ball Catapultby Mechanical Master
Knex Catapultby Zenosythe
K'nex Ball Machine Lift Instructions: Full Automatical Giant Ball Catapultby Mechanical Master
Knex Catapult, special reloading system, made by my 7 year old nephew Joepby TigerNod
knex catapultby Helpfulknex
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