I used to work for Boeing at Everett plant in Washington State. The GE 9's used on triple 7's (777) are huge. Name GE might as well stand for Gigantic Engines, and the number 9 is for diameter of Main Fan. I have stood inside the engine cowling with enormous fan behind me. My house has 8 foot ceilings, the GE 9 would not fit in my house, part of it would be in the attic. Most of air produced when fan is spinning bypasses the compressor and flows around core. 85 percent of power comes from the high volume of bypassed air

Good to see the different examples of not just jet engines (including various military fighter jet engines on test in a hush house facility) but also some boat props.

I thought ship propellers were generally made of bronze, not steel. Either way, molten metal does not 'cure' in the mould, it solidifies (phase change, not a chemical reaction)

The Airbus A350XWB-900 and Boeing 787 Dreamliner are the currently Very Efficient Aircraft using most Technological Efficient Rolls Royce Trent 1000 and XWB type Engines that Are more Fuel Efficient and quite too. 3 and 4 engine Aircraft are slowly being phasing Out And replaced by the 2 Twin engines types.

Question: Does anyone actually need to be told that the engines provide the thrust to power the airplane? If so, how could that someone possibly be smart enough to use a device to watch the video? Just asking.

Just as I'd rather NOT go on an ocean cruise liner with 5,000 people aboard, I don't like traveling on a huge aircraft with 800 people aboard either! But there isn't a lot of choice today! I handle that by either taking a "red-eye:" or a very early a.m. flight. I thought the Concorde had a narrow fuselage, but it was a pleasure to fly it, and I really miss the "Queen of the Skies B-747! Those were the good old days!

Propellers are not made of steel! Bronze being the primary metal used with a close second being Stainless Steel, usually for high performance applications. In actual fact it extremely rear for a propeller to be made of steel.