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SteinarN

Re: Pilots of 777s and 787s warned over pitch-guidance mode slip before take-off

One can argue that any effort to design a fully proof system is a loosing battle. If a medical equipment designer is designing a more nurse proof system, then nature have the undesirable habit of developing a better nurse. I suspect this phenomenom is equally valid for aircrafts and it's pilots. But...

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SteinarN

Re: Pilots of 777s and 787s warned over pitch-guidance mode slip before take-off

I found this quote from the FAA information bulletin interesting: If in ALT mode while on the ground, pressing TO/GA switch will have no effect on pitch mode or guidance. Selecting both F/Ds “OFF” then “ON” while on the ground will restore intended, default TO/GA pitch guidance. Basically, if pilot(...

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SteinarN

Re: Pilots of 777s and 787s warned over pitch-guidance mode slip before take-off

https://rgl.faa.gov/Regulatory_and_Guid ... -22-09.pdf

SteinarN

Re: China Eastern 737-800 crashes in Guangxi, southern China

The aircraft must have started with a violent roll to the left, reaching inverted before point #3. Then continued left roll towards wings level around point #6. Then pilots have tried leveling off, which they managed to do, for a while. I will make an argument for one of two possible causes. Either ...

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SteinarN

Re: China Eastern 737-800 crashes in Guangxi, southern China

Something obviously happened quickly. Seen from the outside, the aircraft must either have sheed some significant arrodynamic part, or some control surface must have deflected considerably. Lets for a moment guess the start of event was full deflection of the rudder, and we guess the AP was still co...

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SteinarN

Re: Ode to Mriya, AN-225 confirmed destroyed

Antonov have taken the initiative to restore the An-225 Mriya. They say it is important for several reasons. "‼️✈️ The Antonov plant took the initiative to restore the legendary An-225 (Mriya) aircraft, which was destroyed during the battles for Gostomel. This was stated by General Director of ...

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SteinarN

Re: China Eastern 737-800 crashes in Guangxi, southern China

Why would they scr themselves with a "political" grounding? And why this late after the accident? If that was the case they would have done it immediately. IMHO they have data showing that it was aircraft-related. Seriously what data would be available this soon after the crash that would...

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SteinarN

Re: China Eastern 737-800 crashes in Guangxi, southern China

Just some thinking. I think the wings or other large part of the aircraft was broken off before impact. The reason is as follows: Very high speed impact would leav only small, dirty/burnt remains of the aircraft. The pic of panel parts from the aircraft shows larger parts, several, maybe ten feet lo...

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SteinarN

Re: Discussion on Potential 777XF Specs

Airbus has released more information about the A350F (https://www.airbus.com/en/newsroom/stories/2022-02-a350f-five-reasons-why-it-will-deliver-freight-in-a-smarter-way) ------------------ On top of the low fuel consumption which already contributes to major savings, the A350F’s unbeatable economic...

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SteinarN

Re: Qatar Airways News and Discussion Thread - 2022

Maybe Qatar should revert to this livery on their A350's, less dark colour, more white gives less heat on the skin when parked in the sun

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SteinarN

Re: Discussion on Potential 777XF Specs

Regarding the 787 spesifically, I think it has a very thin wing, I dont actually know it's thickness, but it is flexing a LOT in flight, compared to pretty much any aircraft. That much flexing indicates a thin wing, and a thin wing is comparatively heavy. The opposite example I think would be the A3...

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SteinarN

Re: Discussion on Potential 777XF Specs

Some more comparison, maybe it was already mentioned: A350F: length 70,8m MTOW 319t MLW 250t EW -8t compared to 777-8F ‚Maximum‘ payload 109t Usable payload 100t Volume 694m3 Range 4700nm (8700km) @ max payload (dunno if 100 or 109t) 777-8F: length 70,9m MTOW n/a MLW n/a EW +8t compared to A350F ‚S...

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SteinarN

Re: Discussion on Potential 777XF Specs

On a freighter where shorter stage lenght is the normal the aircraft should ideally have slightly shorter wing span and, surpricingly, slightly less efficient engines making the OEW quite a bit less heavy. Ah but then you open a whole new can of worms with re-certification and tons of new flight te...

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SteinarN

Re: Discussion on Potential 777XF Specs

would guess OEW is higher than expected as well. The obvious possible answer is Boeing doing what they did on 787 to cut costs and using heavier/less expensive/easier to work with materials to keep production costs down just like when they reengineered the 787. Your premise is correct but the mecha...

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SteinarN

Re: QR to order up to 50 777-8 Fs and signing MOU for up to 50 737-10 MAXs

https://www.boeing.com/commercial/freig ... -highlight

SteinarN

Re: Discussion on Potential 777XF Specs

1 main-deck, 1 lower-deck and 9 tons more. Range about the same with equal payload. In other words an aircraft which is 15-ish tons heavier and require a 40-ish tons MTOW, to delivery very little extra. Not impressed but, then again, my impression is of zero value in this game. Let’s see what the o...

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SteinarN

Re: Discussion on Potential 777XF Specs

On Boeing's website 777F volume is 652.7 m3, 777-8F volume is 766.1m3. Airbus' linked document has the A350F volume at 71m3 more than the 777F which would make it ~723.7m3. That would make the difference about 5.8% between the A350F and 777-8F in terms of volume. Thank you. I will from now on inves...

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SteinarN

Re: Discussion on Potential 777XF Specs

See my previous post. Total volume will be only some 3 percent more due to the main deck pallets beeing much larger than the belly containers. Main deck volume +3% Belly volume +8% But since main deck volume is much much larger than belly volume the combined total volume vwill only be somewhere bet...

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SteinarN

Re: Discussion on Potential 777XF Specs

Volume is 4.8% more for the 777XF in total number of pallets , 44 pallet capacity versus 42 for the A350F. Both look very similar in range, fuel burn per tonne is very close depending on mission payload weight. The 777XF has a higher list price. Actual acquisition cost for each is unknown. Total op...

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SteinarN

Re: Discussion on Potential 777XF Specs

Delete

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SteinarN

Re: Discussion on Potential 777XF Specs

Ok, so, one pallet more on the main deck, thats plus 3%. In the belly? maybe the same number of positions? or one more? Weight, maximum 9 tons more, thats about +8%, but at a shorter range. At same range say +5 tons or ca 4% So, in conclusion, by volume +3%, by weight between +4% and +8% depending ...

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SteinarN

Re: Discussion on Potential 777XF Specs

The 777-8F is 232'6" according to Boeing's website, so it's stretched compared to the original 777-8 length. The 777-8F should carry carry 31 main deck pallets and 13 in the lower hold. The A350F should carry 30 main deck pallets and 12 in the lower hold. Airbus' website shows the A350F as hav...

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SteinarN

Re: Discussion on Potential 777XF Specs

Ok, so, one pallet more on the main deck, thats plus 3%. In the belly? maybe the same number of positions? or one more? Weight, maximum 9 tons more, thats about +8%, but at a shorter range. At same range say +5 tons or ca 4% So, in conclusion, by volume +3%, by weight between +4% and +8% depending o...

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SteinarN

Re: Discussion on Potential 777XF Specs

How does main deck pallets, belly containers and volume compare to A350F?

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SteinarN

Re: QR to order up to 50 777-8 Fs and signing MOU for up to 50 737-10 MAXs

From Qatars press release: "Boeing is designing the 777-8 Freighter, the newest member of the 777X family, to maximize efficiency and environmental performance. The widebody family features engineering design improvements and innovative technologies, including a new carbon-fiber composite wing ...

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SteinarN

Re: Boeing Hints at Next New Jet as It Weighs Tough Engine Decisions

Two possible design challenges with such a design. Where are the gear attached and stowed? Where to place large fuel tanks for +3000nm range? The wings are very thin and dont offer much space for fuel. Edit: If the gear is placed in the engine nacelle, which requires quite a bit larger nacelle than...

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SteinarN

Re: Boeing Hints at Next New Jet as It Weighs Tough Engine Decisions

Two possible design challenges with such a design. Where are the gear attached and stowed? Where to place large fuel tanks for +3000nm range? The wings are very thin and dont offer much space for fuel. Edit: If the gear is placed in the engine nacelle, which requires quite a bit larger nacelle than ...

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SteinarN

Re: Airbus and Boeing 2021 orders

The A220 are really picking up speed it seems. How many firm orders have the A220 received this year? And how many MOU/LOI?
Sorry for not digging up the numbers my self...

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SteinarN

Re: Airbus A321XLR Development Production Testing Thread - 2021

Thought it worth mentioning again the slightly confusing model number differences between the LR and XLR, using some selected examples below : A321-251NXLR = 200 series ("2"), CFM engines ("5"), std engine rating ("1"), neo ("N"), ACF cabin ("X") lo...

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SteinarN

Re: Updated: Airbus goes legal as Qatar Airways jet row escalates

Couldn't see this posted previously - sorry if it has been. Airbus have posted a response https://www.airbus.com/en/newsroom/press-releases/2021-12-airbus-confirms-to-have-received-a-formal-legal-claim-by-qatar Toulouse, 20 December 2021 - Airbus received a formal legal claim in the English courts ...

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SteinarN

Colombia-Germany/France-Norway Covid19 regulations?

Hi, I have tried to search, but am not sure what current regulation are. When traveling from Colombia to Norway with a stopover in Fance or Germany with Air France or Lufthansa, what are the current rules? Some type of vaccine passport, recent negative covid test? Something else? I think so far I've...

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SteinarN

Re: MDD 1990s = Boeing 2020s?

The idea that the 737 is 50-year-old technology is like saying the GMC Suburban is based on 1934 technology, since the nameplate is that old. Yes, it is wrong, because it is more like 60 year old technology. Top be spesific. Lack of Fly By Wire, how many decades is it since cable control was abando...

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SteinarN

Re: MDD 1990s = Boeing 2020s?

How long is it since the last non-containerized six abreast aircraft was designed? Four decades? Remember the A318? Well, the cross section of the hold certainly don't prohibit the the use of containers. If containers is not used it is because the hold is very very short and low on volume. Containe...

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SteinarN

Re: MDD 1990s = Boeing 2020s?

The idea that the 737 is 50-year-old technology is like saying the GMC Suburban is based on 1934 technology, since the nameplate is that old. Yes, it is wrong, because it is more like 60 year old technology. Top be spesific. Lack of Fly By Wire, how many decades is it since cable control was abando...

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SteinarN

Re: Gulfstream IV Crash Dominican Republic

Thanks!
It was a short flight. It seems the airspeed vas somewhat ok, but pitch control was not there at all.

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SteinarN

Re: Gulfstream IV Crash Dominican Republic

Any link to the Flight Aware track?

Thanks in advance

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SteinarN

Re: Updated: Reuters: Airbus launches A350 freighter

According to the link below the A350F will have 319tons MTOW and 250tons MLW. If like the A351 it will have 13tons difference between MZFW and MLW then MZFW will be 237t. That givers us an OEW of 128tons (237-109). https://aircraft.airbus.com/en/aircraft/freighters/a350-freighter Maximum landing we...

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SteinarN

Re: Updated: Reuters: Airbus launches A350 freighter

Can you negotiate with customers without an ATO? Are we really sure Boeing board have made an ATO for the 77XF? Are we sure "negotiations" are the correct word? What if Boeing have shown customers a consept with preliminary specs of what Boeing could start designing/developing if customer...

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SteinarN

Re: Updated: Reuters: Airbus launches A350 freighter

Maybe Boeing wants (or needs?) to optimize the 77XF specs in order to come with a viable alternative for the A350. This :checkmark: Boeing probably had a somewhat good idea of the specs they could offer to customers. However I think the specs of the A350F caught Boeing off-guard, as well as I dont ...

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SteinarN

Re: Updated: Reuters: Airbus launches A350 freighter

The biggest news to me seems to be that the 777XF has not been launched yet. Did the A350F really spoil the Dubai set up? Maybe Boeing wants (or needs?) to optimize the 77XF specs in order to come with a viable alternative for the A350. This :checkmark: Boeing probably had a somewhat good idea of t...

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SteinarN

Re: Updated: Reuters: Airbus launches A350 freighter

This is pretty much in line with what Airbus have been saying for quite some time. I feel confident the A350F will be/are a very capable and efficient freighter, so much so that Boeing have to do some pretty significant work on their B777XF to be competitive. I think both the freighter majors as wel...

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SteinarN

Re: Airbus A350XWB ongoing evolutionary enhancements, EIS 2025-2030.

which should be ~10% better sfc than the Trend XWB according to a RR chief engineer Geer. (Starting 48:30 in the video). With such a significant SFC gain, I think the chances Airbus will not simple stretch the A350 at the same time are pretty close to zero. Already it is more than capable enough. T...

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SteinarN

Re: Airbus A350XWB ongoing evolutionary enhancements, EIS 2025-2030.

I have said several times before, this engine put on the A350 would be the end of the B777X.
And I think it will be put there, with service entry before the end of the decade.

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SteinarN

Re: Updated: Reuters: Airbus launches A350 freighter

I think the A350F will turn out to be a runaway sucess, relatively speaking. I also think that Boeing is still not very close to launching their competitor, judging from statements such as they was still looking at the best lenght of the fuselage, whether Boeing should increase the lenght compared w...

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SteinarN

Re: Boeing tipped to launch 777X freighter at Dubai Air Show

Where is the 109t payload @ 4700nm for the 777XF coming from? I gave it the same numbers as the A350F to try and see how much weight reduction Boeing had to find from the deletion of the passenger cabin and shortened fuselage to enable the 777XF to have this payload performance at the same range as...

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SteinarN

Re: Boeing tipped to launch 777X freighter at Dubai Air Show

I have made some back-of-the-napkin calculations. Starting numbers B777X: 426 passengers, 7300nm range @351ton TOW XF: 109ton payload at 4700nm range @351ton TOW Compared to A350-1000: 369 passengers, 8700nm range @319ton TOW 350F: 109ton payload at 4700nm range at 317ton TOW For the A350F we conver...

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SteinarN

Re: Updated: Reuters: Airbus launches A350 freighter

@Revelation Where on earth do you have the information from that the TXWB-97 is a throttle push of the TXWB-84? One of the complaints about these engines is that the comonality got so low on them. They are substantially different engines. Time to modify the ignore list... Am tired reading sore ass p...

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SteinarN

Re: Dubai Air Show 2021 - Airbus Orders and General Discussion Thread

https://leehamnews.com/2021/11/14/indigo-partners-airlines-kick-start-single-aisle-recovery-with-large-joint-order/ "Airbus chief commercial officer Christian Scherer said this was a top-up order for Airbus, effectively selling out all remaining A320 family deliveries through 2025." Boein...

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SteinarN

Re: Airbus A350XWB ongoing evolutionary enhancements, EIS 2025-2030.

I just ran a model on a 80m A350 (a lengthened A35K), this gives almost identical cabin area to the 779X. I assumed an OWE of 158t with a MZFW of 233t and MTOW of 323t and it had a range with 420 pax and bags of ~7700nm. I have done an analysis on a stretch of the A359 to A35K length (simple stretc...

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SteinarN

Re: Airbus A350XWB ongoing evolutionary enhancements, EIS 2025-2030.

I just ran a model on a 80m A350 (a lengthened A35K), this gives almost identical cabin area to the 779X. I assumed an OWE of 158t with a MZFW of 233t and MTOW of 323t and it had a range with 420 pax and bags of ~7700nm. I have done an analysis on a stretch of the A359 to A35K length (simple stretc...

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