How to defend propellers?!

Hi folks,
I was thinking about how to defend propellers and the frame from damages

And I came to the idea to cover the frame with polyurethane foam.

http://users.jyu.fi/~mweber/blog/ima...m_mushroom.jpg

this stuff is cost nothing and you can easy make any shape you want.
For example - like this
http://picasaweb.google.com/vePetrov...22297807395842

What do you think about?

By the way, the similar protaction is available for "PARROT"

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