Search found 568 matches

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by tomcat
Sat Sep 19, 2020 5:48 pm
Forum: Technical/Operations
Topic: Why no more multi-slot flaps?
Replies: 32
Views: 2574

Re: Why no more multi-slot flaps?

The A300 and A310 wings also had less sweep (28°) than their closest Boeing equivalent, ie the 767, which had a 31.5° sweep. Less sweep is beneficial for the low speed characteristics and that helps to keep a simpler flap design (other things being equal). That's a good point. The original 777 had ...

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by tomcat
Fri Sep 18, 2020 8:19 pm
Forum: Civil Aviation
Topic: Airbus is stepping up development A321XLR
Replies: 227
Views: 34300

Re: Airbus is stepping up development A321XLR

MoKa777's link to anna aero refers to trip cost, not CASM. Don't ignore this: Naturally, lower-capacity aircraft result in higher unit costs as there is less output over which to spread costs, and therefore higher breakeven fares. Based on Dublin – Newark, RDC indicates that the A321neo would have ...

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by tomcat
Fri Sep 18, 2020 7:38 pm
Forum: Civil Aviation
Topic: The Airbus A380 Turns 15 Today (April 27)
Replies: 175
Views: 19502

Re: The Airbus A380 Turns 15 Today (April 27)

I think the bigger issue with comfort with respect to air travel is that the marginal cost of a meaningful amount of additional comfort is very high I don't deeply disagree but you're talking about price again whereas I was talking about value. Value is a human concept not subsumed by price. When i...

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by tomcat
Thu Sep 17, 2020 3:15 pm
Forum: Technical/Operations
Topic: Why no more multi-slot flaps?
Replies: 32
Views: 2574

Re: Why no more multi-slot flaps?

Seems like with the exception of the A321, Airbus has preferred the single slotted flaps from the start for all their planes? Their first designs/widebodies (A300/A310) weren’t really heavy for the time; light twins, for relatively shorter routes. The next generation were essentially a half generat...

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by tomcat
Thu Sep 17, 2020 2:13 pm
Forum: Civil Aviation
Topic: Airbus is stepping up development A321XLR
Replies: 227
Views: 34300

Re: Airbus is stepping up development A321XLR

Given the topic and points under discussion, I think this article (published 2 days ago) may offer some insight or be a springboard for more discussion: Aer Lingus to use A321neos to Newark + Toronto, with its A330-300s having 50% higher costs, RDC Apex platform shows https://www.anna.aero/2020/08/...

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by tomcat
Wed Sep 16, 2020 6:01 pm
Forum: Military Aviation & Space Flight
Topic: Greece Getting 18 Rafales
Replies: 32
Views: 3282

Re: Greece Getting 18 Rafales

When Greece went into financial meltdown a decade ago, with massive cuts and a lot of political instability, it's odd to note that there did not seem to be any real defence cuts, witness those F-4's still flying, you'd have thought that old equipment would be have phased out then, It's not as if we...

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by tomcat
Wed Sep 16, 2020 5:39 pm
Forum: Military Aviation & Space Flight
Topic: USAF PCA and other 6th gen fighters
Replies: 134
Views: 18811

Re: USAF PCA and other 6th gen fighters

That's good news for the airframe development but then what about the systems and equipment's of the said airframe? It's usually them (and sometimes the engine) that are ever delaying the entry into service of new fighter jets. Problems with system integration is different than airframe integration...

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by tomcat
Wed Sep 16, 2020 4:00 pm
Forum: Military Aviation & Space Flight
Topic: USAF PCA and other 6th gen fighters
Replies: 134
Views: 18811

Re: USAF PCA and other 6th gen fighters

The ability to do full digital prototyping in a virtual wind tunnel and then quickly turn around and build a working, full scale prototype with production quality parts produced from 3D printers of various sizes and types (including ones designed to work with unusual materials) is making a major im...

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by tomcat
Wed Sep 16, 2020 3:44 pm
Forum: Military Aviation & Space Flight
Topic: Greece Getting 18 Rafales
Replies: 32
Views: 3282

Re: Greece Getting 18 Rafales

When Greece went into financial meltdown a decade ago, with massive cuts and a lot of political instability, it's odd to note that there did not seem to be any real defence cuts, witness those F-4's still flying, you'd have thought that old equipment would be have phased out then, It's not as if we...

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by tomcat
Tue Sep 15, 2020 6:46 pm
Forum: Military Aviation & Space Flight
Topic: Greece Getting 18 Rafales
Replies: 32
Views: 3282

Re: Greece Getting 18 Rafales

^^^ The data mentioned in the article are way off. I would have expected much better than Flightglobal. The actual numbers are as follows: Dassault Mirage 2000 BGM&EGM____17 Dassault Mirage 2000-5 Mk2________25 F-16 block 30____________________31 F-16 block 50 &52+_______________84 (current...

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by tomcat
Tue Sep 15, 2020 5:41 pm
Forum: Civil Aviation
Topic: Lufthansa Group Fleet Thread - 2020
Replies: 168
Views: 35203

Re: Lufthansa Group Fleet Thread - 2020

Lufthansa's CEO: - "The only four-engine aircraft with a future is the Boeing 747-8." - A340-600 and 747-400 retirement "will come soon" - Decision to retire A380s will be made next week. If any are retired, that "probably would mean all". - In talks with Airbus to spe...

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by tomcat
Mon Sep 14, 2020 9:36 pm
Forum: Military Aviation & Space Flight
Topic: Greece Getting 18 Rafales
Replies: 32
Views: 3282

Re: Greece Getting 18 Rafales

Some more details on the Greek order: In addition to the acquisition of 18 Rafales, 10 Mirage 2000s will be upgraded to the Mirage 2000-5 standard. https://www.flightglobal.com/fixed-wing/greece-orders-18-rafale-fighters/140150.article It also appears that the Rafales would replace the (non moderniz...

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by tomcat
Fri Sep 11, 2020 8:36 pm
Forum: Civil Aviation
Topic: Lufthansa Group Fleet Thread - 2020
Replies: 168
Views: 35203

Re: Lufthansa considering to remove A380 from the Fleet

The 380 burns too much fuel for what it could have been with a wing not restricted to 80m, but hardly is anything near 95% load factor required. And it burns too much fuel per seat compared with modern twins not in absolute numbers, but if you factor risk of filling around 500 seats vs 250 in. The ...

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by tomcat
Fri Sep 11, 2020 6:09 pm
Forum: Civil Aviation
Topic: Lufthansa Group Fleet Thread - 2020
Replies: 168
Views: 35203

Re: Lufthansa Group Fleet Thread - 2020

They seem to keep the types that are offering the greatest volumetric cargo capacity which seems logical since the shortages of global cargo capacity is expected to last for a while due to the reduction of long-haul passenger demand.

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by tomcat
Fri Sep 11, 2020 1:47 pm
Forum: Technical/Operations
Topic: Placement of Engines on Wings
Replies: 11
Views: 1586

Re: Placement of Engines on Wings

In the event of an uncontained engine failure you may want to avoid the other engine of the same wing to sit in the way of the debris. Placing the outboard engine far enough from the inboard engine creates a longitudinal separation between both engines (at least on a swept wing). I don't know whethe...

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by tomcat
Wed Sep 09, 2020 7:14 pm
Forum: Civil Aviation
Topic: The case for more aircraft production cuts/playing chicken
Replies: 119
Views: 10128

Re: Airbus and Boeing playing chicken with production rates?

Their challenge is to cut the production without killing their supply chain otherwise they would pretty much suffer the same fate in the short term. Building white tails now gives them a chance to still be viable when the demand will return if it's not too far in the future.

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by tomcat
Wed Sep 09, 2020 3:52 pm
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

Automated lines have for ages had checks in place to ensure that products that are coming off the line are of the desired quality. You can go to a biscuit factory today, and a machine will get rid of pieces that shouldn't make it to packaging. You can go to a truck manufacturing plant, and robots w...

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by tomcat
Wed Sep 09, 2020 3:33 pm
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

It's not the item (the shim) that hasn't been tested by Boeing but the process to manufacture it. It looks like this process was sort of automated and not so much operator-dependent. It appears also that Boeing has relied on the fact that this process was supposed to produce conforming parts and th...

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by tomcat
Wed Sep 09, 2020 1:56 pm
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

Wait, there are untested components on the 787? I get that it may not be a problem, but there are items on the 787 they declined to test before using them in production. This seems very serious. What else have they neglected to test before using it in production? It's not the item (the shim) that h...

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by tomcat
Wed Sep 09, 2020 12:13 pm
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

As Boeing engineers comb through records to identity planes with possible flaws, the FAA already has learned what prompted one of the defects: The plane maker didn’t test how it produces shims, or material that fills gaps between barrel-shaped sections of the jets’ fuselages, to ensure they meet re...

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by tomcat
Tue Sep 08, 2020 10:11 pm
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

Dominic Gates ( https://twitter.com/dominicgates/status/1303395951948652544 ) says they've only delivered 13 while producing 50 or so since March. Thank god for small favors, I guess. Who cares about the few short term deliveries if like the rear fuselage issue, the HTP issue will require the inspe...

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by tomcat
Tue Sep 08, 2020 9:39 pm
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

Just been sent this The affected planes haven’t been delivered to customers yet, and “We expect these inspections to affect the timing of 787 deliveries in the near term,” spokesman Peter Pedraza said in a statement. Dominic Gates ( https://twitter.com/dominicgates/status/1303395951948652544 ) says...

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by tomcat
Mon Sep 07, 2020 12:29 pm
Forum: Military Aviation & Space Flight
Topic: MiG 25 Foxbat operators
Replies: 11
Views: 1914

Re: MiG 25 Foxbat operators

Who still uses the MiG 25 Foxbat in 2020. Cause I know Algeria still fly them but I not to sure on any other. Libya hasn't used any during the civil war leading me to believe they have been retired. Syria hasn't used any MiG 25 Foxbats since the beginning of the war and they look like there in stor...

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by tomcat
Sun Sep 06, 2020 9:49 pm
Forum: Military Aviation & Space Flight
Topic: Best BVR Fighter in 1970
Replies: 50
Views: 2759

Re: Best BVR Fighter in 1970

I was thinking about the one of a kind English Electric Lightning but it didn't really have BVR capabilities by 1970. At that time, the longest range missile it could carry was the Red Top missile. This was an infrared homing missile with a range of 7.5 miles. Please don't mention the Tomcat ;-). ht...

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by tomcat
Thu Sep 03, 2020 10:54 am
Forum: Military Aviation & Space Flight
Topic: Greece Getting 18 Rafales
Replies: 32
Views: 3282

Re: Greece Getting 18 Rafales

In the event that Greece does acquire some Rafales, would Germany be prepared to sell its Tranche 1 Typhoons to Turkey when rhey brcome available? I don't know (a) if Turkey would be interested (b) if Germany would want to supply arms to a European dictatorship (c) if Germany would want to support ...

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by tomcat
Wed Sep 02, 2020 9:08 pm
Forum: Civil Aviation
Topic: The case for more aircraft production cuts/playing chicken
Replies: 119
Views: 10128

Re: The case for more aircraft production cuts

At some point, consolidation will become an option if not the logical way forward. The lineup of a potential Transatlantic Aircraft Company joint venture could be simplified to the A320 family on one side of the pond and to the 787 (including a freighter option) in SC. Boeing and Airbus would remain...

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by tomcat
Wed Sep 02, 2020 5:17 pm
Forum: Military Aviation & Space Flight
Topic: Second tier advanced fighter projects news and discussion
Replies: 130
Views: 23898

Re: Second tier advanced fighter projects news and discussion

Japan looking for more help on F-X project Japan’s Ministry of Defense (MoD) has published a notice inviting foreign companies to engage with its project to develop next-generation fighter aircraft. The notice – issued on 25 August – invites firms to be involved in the development phase of the F-X ...

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by tomcat
Wed Sep 02, 2020 2:03 pm
Forum: Military Aviation & Space Flight
Topic: French President's A330 Damaged being Towed in Beirut
Replies: 14
Views: 2407

Re: French President's A330 Damaged being Towed in Beirut

The A330 can be flown with one winglet removed under the configuration deviation list it does result in a reduction in the MZFW and MTOW. Looks like the whole hanger moved suddenly by some distance while the aircraft was being towed and hit the aircraft. Is there any need of rudder compensation whe...

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by tomcat
Tue Sep 01, 2020 9:22 pm
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

Hope it’s confined to those 8 airframes, the article states it is but then goes on to say they have to look at the rest of the in service fleet. The article said Boeing looked at the rest of the in-service fleet and identified only eight airfames with these two issues. Strange, something by the way...

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by tomcat
Tue Sep 01, 2020 9:01 pm
Forum: Civil Aviation
Topic: American Airlines pilot saw someone with a jetpack on approach into LAX
Replies: 51
Views: 8455

Re: American Airlines pilot saw someone with a jetpack on approach into LAX

Any chance this jet(wo)man could have jumped from an helicopter or a plane from a higher altitude or at least from somewhere above the ground? This would have helped him/her to reach 3000ft altitude.

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by tomcat
Tue Sep 01, 2020 6:39 pm
Forum: Military Aviation & Space Flight
Topic: Greece Getting 18 Rafales
Replies: 32
Views: 3282

Re: Greece Getting 18 Rafales

Just a thought about the Greek fighters fleet: they still operate 33 modernised (equipped with an APG-65 radar) F-4E as well as 16 Mirage 2000EG and 24 M2000-5. The used F1/F2 Rafales would be suitable to replace the M2000EG. Later on, the M2000-5 could be replaced with F-3 Rafales. Greece has quite...

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by tomcat
Tue Sep 01, 2020 6:31 pm
Forum: Military Aviation & Space Flight
Topic: Greece Getting 18 Rafales
Replies: 32
Views: 3282

Re: Greece Getting 18 Rafales

This coincides with the announcement by the French Defense Minister that France could bring forward their next order for 30 Rafales. In the current procurement planning this order is scheduled for 2023. The new schedule would be defined in order to better support Dassault and avoiding them a too low...

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by tomcat
Mon Aug 31, 2020 11:21 am
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

So about at least every thenth 787 flying around has built in one of the two issues! I was wrong... x = 0.089 -> occurence of one of the issues. So the number of 787s with at least one the issues is x + x. Means 2x = 0.18 Means that nearly every fifth 787 has built in one of the two issues. Which m...

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by tomcat
Sun Aug 30, 2020 10:16 pm
Forum: Civil Aviation
Topic: Bomb laden drone towards Abha Airport...destroyed??
Replies: 3
Views: 2368

Re: Bomb laden drone towards Abha Airport...destroyed??

Reuters is also reporting this event. It seems that the drone has been intercepted fairly close to the airport judging by this report: As a result of intercepting the drone, some splinters fell on the airport, causing no injuries or damage, coalition spokesman Colonel Turki al-Malki said, according ...

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by tomcat
Sun Aug 30, 2020 11:19 am
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

Now can such a fault be fixed or will Boeing have to deliver 8 787 for free as replacements. I have no Idea how to work with composites so I hope someone can enlighten me. The Air Current article has the following quote: a repair is "in the ballpark of two weeks" per plane There are 2 def...

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by tomcat
Sun Aug 30, 2020 12:10 am
Forum: Civil Aviation
Topic: Boeing Removes 8 x 787 From Service over Structural Issues
Replies: 179
Views: 37199

Re: Boeing Removes 8 x 787 From Service over Structural Issues

Can you please elaborate? I also read up thread that you can’t fasten CFRP to aluminum. How do both materials coexist in the same airframe? Is there some intermediary material? As the article notes, there are naturally-occurring gaps in the CFRP structures. It's probably a side-effect from the tape...

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by tomcat
Sat Aug 29, 2020 2:45 pm
Forum: Civil Aviation
Topic: Flight attendant closes overhead bins upside down with high heels
Replies: 18
Views: 8473

Re: Flight attendant closes overhead bins upside down with high heels

Damaging overhead bins for dummies, part 1.

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by tomcat
Thu Aug 27, 2020 6:50 pm
Forum: Civil Aviation
Topic: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled
Replies: 72
Views: 8941

Re: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled

Are you serious about 500 units/month? Research Vern Raeburn at Eclipse, virtually identical level of craziness. Well I've just made up this number but to me it's the whole point of a groundbreaking concept. Otherwise it's not a groundbreaking concept. But here is the hint of rationale that I have ...

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by tomcat
Thu Aug 27, 2020 4:22 pm
Forum: Civil Aviation
Topic: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled
Replies: 72
Views: 8941

Re: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled

Are you serious about 500 units/month? Research Vern Raeburn at Eclipse, virtually identical level of craziness. Well I've just made up this number but to me it's the whole point of a groundbreaking concept. Otherwise it's not a groundbreaking concept. But here is the hint of rationale that I have ...

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by tomcat
Thu Aug 27, 2020 4:05 pm
Forum: Civil Aviation
Topic: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled
Replies: 72
Views: 8941

Re: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled

I changed the title as a V-12 diesel pushing a propeller, not a bizjet. I'm a fan of small propeller aircraft. My opinion will depend on the purchase price. The cost per flight hour seems low for a V-12 powered aircraft. Lightsaber If this engine is as reliable and efficient as any (German) car die...

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by tomcat
Thu Aug 27, 2020 1:51 pm
Forum: Civil Aviation
Topic: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled
Replies: 72
Views: 8941

Re: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled

Sokes wrote:
"Speeds comparable to commercial aviation":
A bit more precise would be nice.

"Jet like speeds":
I doubt that.


They talk about a cruise speed of 460mph. This is indeed equivalent to the cruise speed of the smallest businessjets.

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by tomcat
Thu Aug 27, 2020 1:46 pm
Forum: Civil Aviation
Topic: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled
Replies: 72
Views: 8941

Re: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled

I changed the title as a V-12 diesel pushing a propeller, not a bizjet. I'm a fan of small propeller aircraft. My opinion will depend on the purchase price. The cost per flight hour seems low for a V-12 powered aircraft. Lightsaber If this engine is as reliable and efficient as any (German) car die...

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by tomcat
Thu Aug 27, 2020 1:38 pm
Forum: Civil Aviation
Topic: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled
Replies: 72
Views: 8941

Re: Potentially groundbreaking Celera 500L bizjet prototype unveiled

I like the idea: much reduced drag combined with a highly efficient engine (especially in comparison with the tiny turbofans equipping the small bizjets). The resulting fuel economy can only be substantial. In terms of operating costs, until this plane will be certified for pilotless operations, th...

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by tomcat
Thu Aug 27, 2020 1:32 pm
Forum: Civil Aviation
Topic: Potentially groundbreaking Celera 500L bizaircraft prototype unveiled
Replies: 72
Views: 8941

Re: Potentially groundbreaking Celera 500L bizjet prototype unveiled

I like the idea: much reduced drag combined with a highly efficient engine (especially in comparison with the tiny turbofans equipping the small bizjets). The resulting fuel economy can only be substantial. In terms of operating costs, until this plane will be certified for pilotless operations, the...

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by tomcat
Tue Aug 18, 2020 8:48 am
Forum: Civil Aviation
Topic: Airbus is stepping up development A321XLR
Replies: 227
Views: 34300

Re: Airbus is stepping up development A321XLR

I agree that the A321XLR has VERY good market perspectives. But how much does a A321XLR have it's lower deck cargo volume blocked by tanks and piping? Could it be used for "everyday services" in between like any other A321neo when not used on long range routes? What would be the penalty t...

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by tomcat
Mon Aug 17, 2020 7:35 pm
Forum: Civil Aviation
Topic: Future Heavy Freight Aircraft (777X)?
Replies: 78
Views: 12495

Re: Future Heavy Freight Aircraft (777X)?

What about tyres? Is take off speed or MLW the limiting factor? I don't know about that. One has to consider the brakes as well. All other things being equal, a higher takeoff speed and/or a higher MTOW and MLW and/or a higher landing speed will require more braking power. In the case of the 777X, ...

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by tomcat
Mon Aug 17, 2020 6:45 pm
Forum: Civil Aviation
Topic: Future Heavy Freight Aircraft (777X)?
Replies: 78
Views: 12495

Re: Future Heavy Freight Aircraft (777X)?

The question is, what does it take to increase the MLW? That is indeed a good question. The -8 is 6 m longer than the -200. Assuming 800 kg/ m as with A340-600, engines and fuselage should be around 10 t extra. Does the new wingbox have the same hight as the old one? If yes the wing would not only ...

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by tomcat
Mon Aug 17, 2020 2:50 pm
Forum: Civil Aviation
Topic: decreased pax traffic, increased cargo traffic - could rearranged pax/freight combi aircraft work?
Replies: 12
Views: 1654

Re: decreased pax traffic, increased cargo traffic - could rearranged pax/freight combi aircraft work?

Hi all, was just thinking, with the decrease in demand for pax traffic due to Covid19, and the increase in cargo, would it make sense to rearrange pax aircraft into combi aircraft? Like: keep the first cabin compartments of an A330/340/350 for pax and the last compartment for cargo with seats remov...

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by tomcat
Mon Aug 17, 2020 10:56 am
Forum: Civil Aviation
Topic: Future Heavy Freight Aircraft (777X)?
Replies: 78
Views: 12495

Re: Future Heavy Freight Aircraft (777X)?

... Boeing also said that GE9X is heavier "more than 2 tonnes" than the GE90-115B. ... On the other hand, it is said that the new engine saves "about 10%" fuel, so the added weight of the new engines will be compensated by less fuel to take for the same flight. We know that a 77...

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by tomcat
Sat Aug 15, 2020 6:45 pm
Forum: Civil Aviation
Topic: Airbus is stepping up development A321XLR
Replies: 227
Views: 34300

Re: Airbus is stepping up development A321XLR

Another interesting feature of the XLR is that it is based on a family that has been initially designed to operate 48000 flight cycles and this has been extended to 60000 FC under the ESG I program. These design service goals have not only driven the airframe design but also the reliability requirem...

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