Alan Epstein | Aeropropulsion

[@shawnmhe]

Invaluable content, thank you for making this accessible to all!

[@edusson]

From an electrical engineer (disclaimer :) )... nice back of the envelope insightful talk!

[@astronot1997]

This is golden

[@zofe]

The British Jet engine was first flown in 1939 and the German in 1938. The German ones (Axial compressor) was extremely sensitive to heating and extremely hard to maintain. It was the Turbocharger & Supercharher, from GE, which won the war for the west, alongside oil resources.

[@08jag81]

The P-51 became a great fighter with the Rolls Royce merlin engine.

[@kenchen704]

If you gave Germany the manufacturing, resources, and population that the US had, you wouldn’t be saying that "GE won".

[@zofe]

@@kenchen704 Germany had all the manufacturing capability till summer 1943, while America started gearing up only January 1942 (the month after pearl-harbor). Germany dumped its scientific class by 1936 thus paid the imminent price in the war it launched - which ended up being decided by technology - mostly computational, remember: real engineers are only those who went through math. and phys. faculties - rather not any technicians. Hitler failed High-school and even the post-office exams, he was nothing but a corporal after 4 years of a brave service at the front, not-commanding or managing anybody or anything.

[@davidwilkie9551]

No new news only new angles, yep.

[@mustafaezberbozan8150]

Bcc could

[@tinolino58]

Dont forget, these are americans.. allways far behind as the study for jet propulsion shows. 🤣

[@ElCineHefe]

Too bad they don't work to produce turbines to get the propellers off of all the small planes. It's 2018 and I still see Cessnas designed back in the 1950s turning propellers.

[@seaplaneguy1]

A prop is an ultra high bi-pass system...totally valid.

[@RandomShit169]

What are you trying to say? How would you propel the Cessna without the propeller?

[@ElCineHefe]

@@RandomShit169 A simple turbine engine that cost less than a complex reciprocating engine.

[@seaplaneguy1]

@@ElCineHefe A reciprocating engine could be made for $3000-4000, but a turbine $500,000. Also, the power needs to be 700 hp or higher to be equal to a piston engine in efficiency (25-27%). My new engine will be 2.4x better than a turbine in fuel per power. Not even close...

[@ElCineHefe]

@@seaplaneguy1 Turbines should cost less than a piston. It's 70 year old technology with fewer moving parts. By now, advanced materials should have caught up to produce an efficient 2000 pound thrust jet engine for the price of a new Toyota sedan.