MD-11 previews? FMC?

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Lizard:
Quote

Well you can't compare the MD11 with the DC-10. MD11 has a much better more sophisticated wing design, more powerful powerplant (almost over 20,000lbs of thrust more in each engine). So really you can't say because its a big plane it can't do it. The MD11 is a complicated bird to fly as it is to engineer. Look at its angle of climb out.


DC-10 doesn't lose much on the climb out, I can tell. And those arguments about V-speeds were factual. Of course when you have a heavier and bigger plane, it needs a bigger speed to get in to the air. MTOW of the MD-11 is MUCH bigger than on the DC-10, that's why those extra 20,000 lbs are there for.   But anyhow, I've seen Vr's over 160 and V1's near 150, and we weren't even on MTOW.

[EDIT] With flaps 10, 290 tonnes as the TOW, V1 is 175, Vr is 190 and V2 196...
With flaps 25, 290 tonnes the same figures are 165, 178 and 183...

ChrisTrott:
Quote

Well you can't compare the MD11 with the DC-10. MD11 has a much better more sophisticated wing design, more powerful powerplant (almost over 20,000lbs of thrust more in each engine). So really you can't say because its a big plane it can't do it. The MD11 is a complicated bird to fly as it is to engineer. Look at its angle of climb out.


Well, first, the wing isn't all that different from the DC-10.  It's primary difference is the way the ailerons are rigged and it's got extensions to the outer wing.  The MD-11 was designed from the outset as a minimum change design so they could get it certificated faster by using as many already certificated parts as possible.

Secondly, as was said above, the issue is that MTOW on the MD-11 is quite a bit higher than the DC-10-30, so any performance gains from the bigger engines and bigger wings is offset by the additional weight.

Finally, have you ever looked at the climbout angle of the DC-10?  It's typically 15-17 degrees!  That's actually MORE than on the MD-11 which is typically 14-16 degrees.  Yeah, it's not much, but the point being that you need to base your comments on fact not your opinions.

Oh yeah...if you think the MD-11 was difficult to engineer, you're wrong.  90% of the problems they MIGHT have encountered were worked out in the DC-10 when it was designed 20 years prior.  The problems the DID encounter were founded in the fact that the engine manufacturers delivered engines that didn't perform as they were required to.

sams:
Hey Martin!

3 folders full of MD-11 data!!!  
That would be a great reading before going to bed!!  

mpauli:
Hi Michael

You've just found out what I'm doing every evening! Or almost every evening. There are still creatures called "women"!

Ok, and for everyone else: Here are some V-speed tables for the bird! The only thing is they are for deflected ailerons inoperative! So you can subtract another 4-5 knots from these speeds. But they are correct anyway:



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So now you've got something to read before you go to bed as well!  


Cheers

Martin

sams:
With this reading, I am sure you sleep much more better!!
(Thanks for the tables!  )

Best Regards
Michael

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