I'm not sure about the grey though - it doesn't feel strong enough. The logo is going to go on a predominately beige/sandy colours background (and lots of white I expect).
Any thoughts on a better colour - maybe a stronger grey (sort of black/grey?)
OK. Thanks for the feedback. Here is my updates : #12 for darker grey. #13 for different speed lines in icon/logo #14 (#13 on beige/sand color background). Thanks