Here is a Lockheed Super Constellation on the takeoff roll, throttling up it’s four Wright R-3350 engines to produce 3250 hp each.
You’ll notice that when the propellers pass abeam the camera they will sound quite loud. This is because the propeller tips are breaking the sound barrier, giving the propeller a sharp, loud sound rather than a hum. When a propeller spins, different parts of the blade are spinning at different speeds. To clarify, the blades are rotating at the same rate (revolutions per minute), but the individual sections are experiencing different velocities. At the propeller hub (center of rotation), the relative velocity is the lowest because the distance the inner portion of the blade travels is short. But, since the blade spins at a uniform RPM, the outer portion of the blade travels a further distance (longer arc), experiencing a different relative velocity.
At full power the tips can break the sound barrier, which increases the noise and decreases propeller efficiency, but the overall power output is the highest.
Hi! Thank you for your recs! May I ask, when you have time, could you maybe suggest me some angst/hurt-comfort fics with good/hopeful endings? Mostly in the canon universe if possible. I am a sucker for comfort stories. Thank you so much! Have a great day!