File:Propeller VBL 2007 07 14.jpg
You are free to use this picture for any purpose as long as you credit its author, Marie-Lan Nguyen (user:Jastrow).
Example: © Marie-Lan Nguyen / Wikimedia Commons
If you use this image outside of the Wikimedia projects, I would be happy to hear from you ( jastrow
pip-pip DOT org).