Конструкции реактивных лопастей , немерено . Патентовать не прекращают . Всё в картинках .
http://www.google.com/search?q=JET+ROTOR+DRIVE+FOR+HELICOPTER&hl=en&tbo=1&tbm=pts&ei=T5c3T9HqEsea-gb4wZGMAg&start=10&sa=N
http://www.google.com/patents/US2795283?printsec=drawing&dq=JET+ROTOR+DRIVE+FOR+HELICOPTER#v=onepage&q=JET%20ROTOR%20DRIVE%20FOR%20HELICOPTER&f=false
http://www.google.com/patents?id=zVdpAAAAEBAJ&pg=PA4&dq=JET+ROTOR+DRIVE+FOR+HELICOPTER&hl=en#v=onepage&q=JET%20ROTOR%20DRIVE%20FOR%20HELICOPTER&f=false
http://www.google.com/patents?id=KNlQAAAAEBAJ&pg=PA3&dq=JET+ROTOR+DRIVE+FOR+HELICOPTER&hl=en#v=onepage&q=JET%20ROTOR%20DRIVE%20FOR%20HELICOPTER&f=false
http://www.google.com/search?q=JET+ROTOR+DRIVE+FOR+HELICOPTER&hl=en&tbo=1&tbm=pts&ei=T5c3T9HqEsea-gb4wZGMAg&start=10&sa=N
http://www.google.com/patents/US2795283?printsec=drawing&dq=JET+ROTOR+DRIVE+FOR+HELICOPTER#v=onepage&q=JET%20ROTOR%20DRIVE%20FOR%20HELICOPTER&f=false
http://www.google.com/patents?id=zVdpAAAAEBAJ&pg=PA4&dq=JET+ROTOR+DRIVE+FOR+HELICOPTER&hl=en#v=onepage&q=JET%20ROTOR%20DRIVE%20FOR%20HELICOPTER&f=false
http://www.google.com/patents?id=KNlQAAAAEBAJ&pg=PA3&dq=JET+ROTOR+DRIVE+FOR+HELICOPTER&hl=en#v=onepage&q=JET%20ROTOR%20DRIVE%20FOR%20HELICOPTER&f=false