Mute
Punika Fakta
Percobaan penerbangan pertama dari desain helikopter primitif yang dikenal sebagai "Pitts Sky Car", 1928. Pitts mematenkan sistem propulsi yang akan memutar baling-baling secara vertikal, menyebabkan baling-baling menutup pada saat turun dan membuka pada saat naik, yang ia harapkan akan mengangkat pesawat dari tanah. Kenyataannya, pesawat itu tidak pernah benar-benar lepas landas. Follow @punika.fakta for more! #punikafakta #igpunikafakta
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