ปีกหมุนของเฮลิคอปเตอร์, เครื่องยนต์, เชิงกล, อำนาจ, เทคโนโลยี, เครื่อง, ใบมีด, ใบพัด, โลหะ, กังหัน, ความเร็ว
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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