I like the idea with the Z from the text matching the Z on the rocket - it means that I can just use the rocket as a secondary logo when there is not enough room for the full logo.
Thank you Stan. I think that possibility to use logo icon standalone very important. I can add dropshadow and other effects to logo but i can't upload them because contest is in judging phase. Only 1's ranked designer can upload logo proposals now. If you want to see version with dropshadow you can extend contest or put me on first place so that i can upload new variations.