The purpose of this research has been to improve the performances of toy projectiles by modifying their design. While the developed product is required to comply with all applicable safety specifications and regulations, it is also required to satisfy customers. Through brainstorming, over 30 designs of projectile were generated, 10 models distilled from brainstorming models were prototyped and evaluated through the performance tests. The performance tests involve distance evaluation, accuracy evaluation, safety evaluation, and supplementary evaluation. The distance evaluation is for verifying the performance of flying farther. This test measures flying distance, and initial velocity through high speed imaging, and calculates distance per kinetic energy, and drag coefficient. The accuracy evaluation indicates how accurately the each projectile model is able to fly to the aim, and it is performed by calculating the variance of the lengths between the center of the dart board and the marks which projectiles made when they bumped into the dart board. The safety evaluation is for confirming the compliance of developed models with the safety standard and it achieved with calculating the kinetic energy density. The supplementary evaluation is for comparing the production error and performing error. Through the analysis of performance tests' results, the models were modified and refined from the best performance model.
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