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Daffy Zone…..

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Old_Me said:
I hear US Navy sailors complain about 'needle gunning'. Is this a form of punishment?
Ships are made of steel. Put steel in salt water, it will rust unless it is painted. If paint is chipping or blistered, it must be removed before you repaint. You remove paint and rust with a power tool called a needle gun. A bunch of steel rods (needles) chip into paint/ rust, removing it. Loud. Vibrates. Leaves you in a NASTY cloud of paint chips. You pissed off your boss? Yeah, you have extra duty. Go chip paint.

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Used one many times throughout my welding years.
 
Why do jet aircraft make a strange halo when they pass the speed of sound?
Jet aircraft are amazing machines that can fly faster than the speed of sound, which is about 1,192 km/h (741 mph) at sea level and 20 °C (68 °F). When they do so, they sometimes create a strange halo around them, which looks like a white ring or cone. This phenomenon is called a vapor cone or a shock collar, and it is related to the sonic boom that the aircraft produces.
A sonic boom is a loud noise that occurs when an object travels through the air faster than the sound waves it creates. This causes the sound waves to pile up and form a shock wave, which is a sudden change in pressure and density. The shock wave travels in a cone shape behind the aircraft, with the aircraft at its tip. The angle of the cone depends on the speed of the aircraft, and the faster the aircraft, the narrower the cone.
The shock wave affects the air around the aircraft and lowers its pressure and temperature. This causes the moisture in the air to condense into tiny droplets, which form a visible cloud. The cloud appears as a halo around the aircraft, following the shape of the shock wave. The cloud disappears quickly, as the air returns to its normal pressure and temperature, and the droplets evaporate.
The vapor cone is not always visible, and it depends on the humidity and temperature of the air. The higher the humidity and the lower the temperature, the more likely the vapor cone will form. It also depends on the altitude and angle of the aircraft, and it is more likely to form when the aircraft is close to the ground and flying at a steep angle. The vapor cone is not harmful to the aircraft or the passengers, and it does not affect the performance or stability of the aircraft. It is just a visual effect that shows the power and speed of the jet aircraft.



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