Ertro wrote:Could somebody explain which design features in a plane make it go faster.
I see people talking that long range planes go faster and widebodies go faster but for me neither of these sound like the design features that actually make the plane faster.
To me it feels that the short vs long range issue is a point of market analysis whether it makes sense to start building these go-fast-features into the plane or not.
Also to an amateur like me my gut-feeling is that being widebody is also not the feature that makes plane go fast but a hindrance.
A plane can be made to go fast despite that it is a widebody if big bosses say that we need to make it go fast and spend the big bucks to make this large blob to travel faster because that is where the market preference has been for widebodies.
Is it more powerful engines? Is it wing design optimized to high speeds? Or something else?
If it is those things could it be possible that a A322 with new wing could suddenly become a high-speed plane and because it is narrowbody it could fly those high speeds more economically than similar seatcount plane that is widebody?
Not knowing anything. Just Asking.
My understanding is wing sweep is the key parameter. Sweep at a sharper angle delays onset of interference patterns at high Mach numbers thus reduction in drag, but sweep at a sharper angle provides less lift at slow speed, so higher takeoff and landing speeds, which are negatives. 707 had a higher wing sweep angle than following planes, because they realized the gain of the sharper wing sweep wasn't worth the pain of high runway speeds.
I think more modern aerodynamics show that you can design a wing that has less wing sweep but still works well at higher Mach number, if you can make the wings longer. This is part of the reason why 777X has a longer wing with less wing sweep angle than 777. Of course longer wings are bad for airport gate spacing, thus the folding wing tips.
I think a lot will change with the "A322" wing, hopefully we get some good descriptions of it once it eventually gets announced. I think it will have less drag and store more fuel than the current one. Boeing did a major reworking of the 737 wing on the NG program, and a big part of that was to reduce drag and improve fuel storage.