BREECH
Topic Author
Posts: 405
Joined: Tue Jun 30, 2009 3:20 am

Twin-engine airplanes technical limitations

Wed Feb 07, 2018 4:17 pm

I was thinking... my favorite thing to do. :-D What would be the maximum possible twin-engine aircraft that modern technology can muster? What would be weight limits with regards to maximum possible engine thrust and wing loading? Length and wingspan are limited by the 80-meter-box but let's forget about that for a moment. Let's talk ONLY about technological aspects. How big a twin can be?
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Sergey Dovlatov
 
GalaxyFlyer
Posts: 553
Joined: Fri Jan 01, 2016 4:44 am

Re: Twin-engine airplanes technical limitations

Wed Feb 07, 2018 4:19 pm

Engines are the limiting factor, period.

GF
 
LH707330
Posts: 1824
Joined: Fri Jun 15, 2012 11:27 pm

Re: Twin-engine airplanes technical limitations

Wed Feb 07, 2018 6:30 pm

With current tech, you can get to ~150k lbst. To get a ballpark idea of what's doable, take the measurements of a 777-9, multiply the MTOW by ~1.45, and see what you end up with. From a packaging efficiency standpoint, you'd want to go double-deck, probably narrower than an A380 (6Y/9Y).
 
Calder
Posts: 194
Joined: Fri Apr 24, 2015 1:34 pm

Re: Twin-engine airplanes technical limitations

Wed Feb 07, 2018 7:13 pm

I assume that a significant factor would be the asymmetrical thrust should you lose an engine, and the rather large rudder needed to compensate for the yawing moment.

So surely rudder size/design has a lot to do with it.

I'm sure someone more technically credentialed than I can elaborate.
C. T.
 
GalaxyFlyer
Posts: 553
Joined: Fri Jan 01, 2016 4:44 am

Re: Twin-engine airplanes technical limitations

Wed Feb 07, 2018 8:49 pm

It’s really an economic issue—they aren’t selling 777X all that well. I suspect that will be as big as any airliner needs to be for a very long time.

GF
 
chimborazo
Posts: 115
Joined: Sun Sep 25, 2011 7:51 pm

Re: Twin-engine airplanes technical limitations

Wed Feb 07, 2018 9:58 pm

You'll notice that on the latest 777 versions, the engines have actually decreased in maximum thrust because of the increase in available lift provided by the advanced wing design.

So to reach the ultimate heaviest lift and remain in the 80m box, you'd need a brace of the highest thrust motors possible AND folding wings... maybe they could even have a "fall-out-of-the-sky" 10m folding section on each wing... :roll:

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