How ro build a jumbo jet engine BBC4 now

[tr7v8]

As above started at 21:00

[jason s4]

Saw this the first time round a little while ago.

Superb viewing and hats off to the engineers.

[Cupramax]

I saw this and had to wonder about all the bravado about the fans not exiting the engine case in testing, so that went tits with the A380 then Still an interesting program though.

[Eric Mc]

There arec plenty of cases of turbine failures breaching engine casongs - on engines that had previously passed such tests.

[Big Fat Fatty]

Eric Mc said:

There arec plenty of cases of turbine failures breaching engine casongs - on engines that had previously passed such tests.

Don't they only test one engine from the production run, or is that what you meant? because they write the engine off for the test and at a few million a piece it's quite expensive but necessary for RR to perform it, even then they admit it's not 100% effective but the casing is there to contain as much of the debris and shrapnel as possible.

I thought it was a superb program the first two times I watched it, it gives a real sense of scale to the operation, especially to think thaat the only other company able to compete is General Electric.

[tank slapper]

Cupramax said:

I saw this and had to wonder about all the bravado about the fans not exiting the engine case in testing, so that went tits with the A380 then Still an interesting program though.

That was a different type of problem, where one of the turbine discs failed. There is no engine that will contain that, since there is too much mass and energy involved. A single turbine or fan blade is much easier to stop.

[Fatman2]

tank slapper said:

Cupramax said:

I saw this and had to wonder about all the bravado about the fans not exiting the engine case in testing, so that went tits with the A380 then Still an interesting program though.

That was a different type of problem, where one of the turbine discs failed. There is no engine that will contain that, since there is too much mass and energy involved. A single turbine or fan blade is much easier to stop.

I've just completed a rotor burst failure analysis and it's a nasty problem. It's classed as infinite energy so can rip straight through an entire wing, fuselage etc.

Sounds horrible (and it is) but fortunately a wing is designed to fly home with chunks ripped out (but obviously to certain limits). Not sure if the A380 pics have been floated about the internet but that wing didn't look good. However it still got everyone home safe.