vertical take off machine

Rotor Rooter said:

"hello my name is Marin, and I have a favor to you.Please look on YouTube and Schr (MARINOHELL)there you will find a drawing of a helicopter.I would like to know, which is your opinion on the aerodynamics of propellers.Sincerely thank you."


The above is an email.
This is the YouTube address. http://www.youtube.com/watch?v=Xw08rJXWxrs
Anyone want to comment or reply? [email protected]

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