Do fighter pilots feel roller coasters?

Yes, they do, but not very often. The sensation is caused by negative or zero g. When a roller coaster begins a decent what you feel are the effects of being virtually weightless.

Why do jet fighter pilots wear masks?

The passengers and pilots would then be safe without masks on until they could make an emergency landing. The answer to why fighter pilots wear their masks, besides the microphone contained inside used for communications, is that the mask provides them with a fresh oxygen mixture to avoid hypoxia symptoms.

How long does plane oxygen mask last?

Oxygen production cannot be shut off once a mask is pulled, and oxygen production typically lasts at least 15 minutes, sufficient for the plane to descend to a safe altitude for breathing without supplemental oxygen.

How does the oxygen system work on a fighter aircraft?

The oxygen system onboard a fighter aircraft delivers a mixture of oxygen and air depending on the altitude the pilot is flying at. At higher altitudes, more oxygen must be added to the air to compensate for lower air pressure.

How does a pilot breathe at high altitudes?

At high enough altitudes, a 100\% mixture of oxygen is supplied. Fly even higher, and the oxygen must be delivered at high pressure. In this situation, the pilot breathes in by relaxing his diaphragm, and must forcibly expel air to breathe out. The pilot would also be unable to talk while breathing out, only while breathing in.

Why do planes have oxygen tanks in the cockpit?

To minimize hypoxia (the lack of oxygen) when flying at higher altitudes. As mentioned by others, when the pressurized cockpit altitude gets above a certain threshold pure O2 is forced into your lungs to keep your blood and brain oxygenated. Hypoxia is a lot like being drunk.

Which aircraft delivered 100\% oxygen?

Every Navy fighter aircraft I flew – F-4, F-14, A-4 – always delivered 100\% oxygen. The only “diluter-demand” system which was selectable to less than 100\% was the F-9 Cougar. All commercial airliners that I flew were not 100\% O2.