To evaluate the concepts the da Vinci I prototype was built and tested and the lessons learnt from the first aircraft were incorporated into da Vinci II featuring two 23m long rotor blades powered by propellers located at the tip and driven by the pilot.

• 为了对这些概念作出评价，制造了达.；芬奇一号原型机，做了试验；再把从这架飞机上取得的经验教训应用到达