St. Peter's Church in Inskip, Lancashire, was built in 1848, financed by the Earl of Derby and William Hornby. It's a Grade II listed building. The original church was built with squared rock-faced limestone and a slate roof, with sandstone...
Have you seen this new wing configuration on these Zipline Deliver Drones? Crazy quiet wishbone design.
About the 13:00 mark they take about it but the whole video is cool.
I wonder if these wings designs are patented or if we’ll see them in...
The pitch and volume of the sound are determined by the size and width of the propellers and how fast they are spinning. Until someone comes up with a way to keep a drone in the air without props, you are not going to see a "stealth drone".