The biggest jet engines ever seen are set to roar on Boeing’s 777X

Re:The biggest jet engines ever seen are set to roar on Boei... by ggcdn on Friday January 04, 2019 @12:16PM (#18825704)

I'm a structural engineer, so when I see forces I like to compare them to common forces I design for in buildings.

That engine produces 115,000 lb of thrust. If I take typical rebar, fy=60ksi, so I will need about 1.916in2, which is about 2 #9 bars.

Two engines per plane, so I could hold back the 777 at full power with 4 #9 rebars. Not bad!

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Re:The biggest jet engines ever seen are set to roar on Boei... by thatoneuser on Friday January 04, 2019 @03:23PM (#18827291)

So if you secured 4 of these rebar perpendicular to the direction of the plane and tied a strong rope from plane to rebar, the result would be the plane couldn’t move and the rebar wouldn’t break or bend?

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Re:The biggest jet engines ever seen are set to roar on Boei... by ggcdn on Friday January 04, 2019 @04:33PM (#18827840)

No, I assumed the rebar is orientated as the 'strong rope'.

If the rebar were positioned as you say, they would yield/bend quite easily.

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Re:The biggest jet engines ever seen are set to roar on Boei... by Stryder on Friday January 04, 2019 @12:56PM (#18826085)

That's pretty cool!

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Re:The biggest jet engines ever seen are set to roar on Boei... by pohl on Friday January 04, 2019 @12:26PM (#18825790)

The article says 105,000lb.

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Re:The biggest jet engines ever seen are set to roar on Boei... by ggcdn on Friday January 04, 2019 @03:04PM (#18827173)

You're right, it was the GE-90 that produced 115k. Rest assured, however, that the quantity of #9 rebars remains unchanged.

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