As a pilot do you trust your parking brakes on a plane?  If you do you are in for a surprise!  Also, your passengers cannot see a running propeller.  Even if you warn them about it they will walk right into it!  Turning your propeller blades into the blades of the grim reaper.  The article will be uploaded soon.  The video can be seen on YouTube at:  Capt.Robert”ThatGuy”Riter.