This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Hercules.propeller.arp. Arpingstone Parts and systems of Lockheed Hercules CJ Hercules RAF Constantspeed propellers Taken with Olympus CUZ Aircraft propellers Aircraft at Cotswold Airport RollsRoyce AE
Page 2023 Free-images.com. All images are Public Domain