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boeing 747 400X, the 400 under a different name or something else?

Posted: Wed Apr 14, 2021 5:44 pm
by thebunkerparodi
Hello, I want to know because I want to use a revell 747 400 for a 400X. I got one diagram showing both name together as if it's the same aircraft, but on another website it give a seating capacity verry different from the 400 (610 seat for the 400X), so I'm kinda confuse now.

Thanks for your answer!

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Thu Apr 15, 2021 12:30 am
by Starlionblue
Boeing monikers with an "X" typically denote proposals and not production versions.

I think the -400X eventually developed into the 747-8.

This article references two different -400X possibilities, one with the same external dimensions as the -400, and one stretched but retaining the -400ER wing.

https://www.flightglobal.com/boeing-def ... 12.article

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Thu Apr 15, 2021 1:47 pm
by thebunkerparodi
thanks for the article! Already used flightglobal for other research (on the 747 8 development per example), and I've seen someone from flightglobal on air crash.

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Fri Apr 16, 2021 7:45 am
by VSMUT
There were several proposed 747 updates in the 1980s and 90s, including a handful confusingly under similar names:

1986 - 747-500: Stretched and powered by unducted turbofans / propfans.

1986 - 747ASP: Pretty much a 747-400 with the shorter 747SP fuselage.

1996 - 747-500X: Stretched to 76,2 meters and a new 777-derived wing with a 77 meter span, new bigger engines, 4 nose wheels and 20 mains.

1996 - 747-600X: Same as the above, but stretched to 85 meters.

1996 - 747-700X: Same as the -600X, but with a wider fuselage.

2000 - 747X and 747X Stretch: Based on the 747-400 fuselage and a stretch at 80,2 meters. Wing was based on the -400, but with the span increased to 70 meters with an insert at the root, ala the A340-500/600. Powered by the A380s EA GP7000 or the unbuilt RR Trent 600. The 747X eventually morphed into the 747-400ER, which Qantas ordered.

2002 - 747-400XQLR: Much more subtle upgrade. Essentially a 747-400 with raked wingtips, updated CF6 engines with sawtooth nozzles, higher MTOM, minor aerodynamic updates to the wings and fairings, 2% lower fuel burn and 300 nm longer range. The skyloft was first brought up here.

There was also the initial 747-8 proposal, which was 2 meters shorter than the final product.

You can find more on the secret projects forum:
https://www.secretprojects.co.uk/thread ... 523/page-2

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Tue Apr 27, 2021 12:44 am
by 744SPX
Good answer VSMUT. You must have the same Boeing book I do.

I never understood the 700X with the wider fuselage (and new wing). At that point its a completely new aircraft. (the renders looked pretty ugly too)

The best 747X proposal was the 2000 version (747X and 747X stretch) with Trent 600 engines and 9 ft wing root extensions (which addressed the -400/400ER's very high wing loading).

The 747-8 started as the 747 Advanced. the 748 was too little too late IMO. The 2000 "X" would have gotten to market much earlier, would have sold better, and would have been a better aircraft.

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Tue Apr 27, 2021 4:25 am
by LH707330
The 400X became the 400ER, which as the article mentions is barely externally different. The only physical change is the very slightly larger tires (51" vs 50" IIRC), which in 144 is negligible. The 610 seating is probably the all-economy layout.

If you're planning to use a Revell 747-400 kit, you'll have to do a bunch of surgery anyway to fix some of the kit's problems. From memory, the wing incidence is wrong, the engine and pylon shape is off, and the nose looks a bit wonky. If you're looking to do a 744, I recommend building the Authentic Airliners kit instead, much more accurate.

I'd strongly recommend looking at airlinercafe.com for modeling tips and conversion pointers, lots of good advice there.

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Tue Apr 27, 2021 8:30 am
by hitower3
LH707330 wrote:
The 400X became the 400ER, which as the article mentions is barely externally different. The only physical change is the very slightly larger tires (51" vs 50" IIRC), which in 144 is negligible.


Did'nt the -400ER have slightly taller winglets too?

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Tue Apr 27, 2021 10:06 am
by VSMUT
744SPX wrote:
I never understood the 700X with the wider fuselage (and new wing). At that point its a completely new aircraft. (the renders looked pretty ugly too)


That entire 1996 family pretty much fell apart because they were all uncertifiable under grandfathering rules. The new wing alone was enough to force a completely new certification program from scratch.

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Tue Apr 27, 2021 10:45 am
by 747classic
Some pictures from the Boeing Archive Department : https://www.flickr.com/photos/airlinere ... 956929557/

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Tue Apr 27, 2021 7:48 pm
by 744SPX
Love those early "iterations" of the Sonic Cruiser. Utilizing the work done with the NASA TF-8 supercritical wing aircraft.

Re: boeing 747 400X, the 400 under a different name or something else?

Posted: Thu Apr 29, 2021 12:55 am
by LH707330
hitower3 wrote:
LH707330 wrote:
The 400X became the 400ER, which as the article mentions is barely externally different. The only physical change is the very slightly larger tires (51" vs 50" IIRC), which in 144 is negligible.


Did'nt the -400ER have slightly taller winglets too?

Not to my knowledge, no. It's possible that some document has the winglet tip higher off the ground on the 400ER vs a 400, but that's due to the bigger wheel/tire thing.