Search found 534 matches

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by gloom
Fri May 07, 2021 5:40 am
Forum: Technical/Operations
Topic: What is the minimum battery power density needed for a 2000nm range?
Replies: 14
Views: 890

Re: What is the minimum battery power density needed for a 2000nm range?

I am talking about 70% propulsion and 60% thermal, for a total of 40 or so. In a car? Phew. I do remember quite a buzz when Scania did an engine to achieve over 50%, some years ago. Generally, the thermal efficiency would be between 8-10% (naturally aspirated, old gas guzzlers) and 40+ % (diesels w...

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by gloom
Fri Apr 30, 2021 5:23 am
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread - 2021
Replies: 186
Views: 67303

Re: Airbus A350 Production/Delivery Thread - 2021

FlightGlobal is reporting that Airbus has formally listed highest-weight A350-1000 at 319t. Since it's a long seen tradition from Airbus, two questions for anyone interested. 1. Do you think more raise(s) of MTOW are in the pipeline? 2. What would be the limit? I'd say there's quite a big chance (n...

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by gloom
Thu Apr 08, 2021 8:37 pm
Forum: Technical/Operations
Topic: APU "Electric" aircraft
Replies: 10
Views: 2075

Re: APU "Electric" aircraft

It seems that this idea had some momentum, but not really being pursued. For other transports that use this kind of solution (hybrid cars, diesel-electric locos), there's a benefit of running high-low profile. You accelerate, then cruise with low to no power. This means you can adjust all electric ...

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by gloom
Thu Apr 01, 2021 9:17 am
Forum: Technical/Operations
Topic: Sourcing old electronics for new planes
Replies: 8
Views: 1488

Re: Sourcing old electronics for new planes

Most is still old stock. Once you start talking small batch fabrication, it is not few bucks more, it is few hundreds more. It is few tenths, or few hundreds, depending on chip and sales. I've found new 8051 at 6 or 7 bucks a piece. When new, back in 80s they were at 4 bucks, I believe? As an examp...

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by gloom
Wed Mar 31, 2021 2:32 pm
Forum: Technical/Operations
Topic: Sourcing old electronics for new planes
Replies: 8
Views: 1488

Re: Sourcing old electronics for new planes

I cannot imagine Intel/Arm/etc will run a factory to make a few hundred chips .. a few hundred thousand would seem low to them. Most of chips are still available somewhere. A chip I ran first assembler on (8051, microcontroller back from 80s combining 8bit core, ROM and RAM, ports etc on one chip) ...

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by gloom
Tue Mar 16, 2021 6:36 am
Forum: Technical/Operations
Topic: Why are engines on planes changed so often?
Replies: 18
Views: 3571

Re: Why are engines on planes changed so often?

Do lessors also swap engines based on time on wing? I do know owners do that to their own engines to avoid both: maintenance check on significant number of engines at one time, and balance wear&tear between different planes flying different routes. Aaaah, and they also match engines closing to m...

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by gloom
Sun Feb 28, 2021 10:33 am
Forum: Technical/Operations
Topic: Airbus planes seeming to switch off engines on hold pattern
Replies: 16
Views: 3997

Re: Airbus planes seeming to switch off engines on hold pattern

Starlionblue wrote:
- It's autothrust on Airbus, not authothrottles.
- It's thrust control, not throttle.


I stand corrected. :white: Thanks.

Cheers,
Adam

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by gloom
Sun Feb 28, 2021 7:17 am
Forum: Technical/Operations
Topic: Airbus planes seeming to switch off engines on hold pattern
Replies: 16
Views: 3997

Re: Airbus planes seeming to switch off engines on hold pattern

Impossible. What you refer to, is most likely just a thrust reduction managed by auto-throttle system. When speed is managed (and while in hold, there's usually constant speed requirement), during turns plane tends to move up/down a bit. And throttles will then adjust thrust to maintain speed as set...

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by gloom
Fri Feb 26, 2021 9:49 am
Forum: Civil Aviation
Topic: Another B777 engine trouble
Replies: 15
Views: 4179

Re: Another B777 engine trouble

Polish press reported 4520 as flight number. FR24 says it's a EI-GET, 773ER. GE engines.

Cheers,
Adam

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by gloom
Sat Feb 20, 2021 9:47 am
Forum: Technical/Operations
Topic: Why No Low Airways Over Northern Ohio & Parts of PA and NY
Replies: 12
Views: 3150

Re: Why No Low Airways Over Northern Ohio & Parts of PA and NY

What is the plan for control outage? Yes, radar or ADS-B is well proven but there must be some plan for failure. What do you mean control outage? I guess all the plans to handle different failure scenarios, where ATC services are affected. Radar(s) not operational, fire at ATC rooms, power outage a...

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by gloom
Sat Feb 20, 2021 7:24 am
Forum: Technical/Operations
Topic: Why No Low Airways Over Northern Ohio & Parts of PA and NY
Replies: 12
Views: 3150

Re: Why No Low Airways Over Northern Ohio & Parts of PA and NY

What is the plan for control outage? Yes, radar or ADS-B is well proven but there must be some plan for failure. I guess it depends on countries involved - Eurocontrol is a coordination/R&D organization, but does not influence individual countries (yet), so less than FAA. I talked about it a fe...

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by gloom
Fri Feb 19, 2021 6:45 am
Forum: Technical/Operations
Topic: Why No Low Airways Over Northern Ohio & Parts of PA and NY
Replies: 12
Views: 3150

Re: Why No Low Airways Over Northern Ohio & Parts of PA and NY

Also, a bunch of countries in Eastern Europe don't have any low level airways altogether. In fact in some countries, like Austria and Hungary, they don't have high level routes either. They've gotten rid of airways entirely. Are you aware of the concept called FRA (Free Route Airspace) in Europe? h...

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by gloom
Fri Feb 19, 2021 6:29 am
Forum: Civil Aviation
Topic: FedEx and Sikorsky: Beginning Trial on Single Pilot Ops for Cargo
Replies: 108
Views: 11654

Re: FedEx and Sikorsky: Beginning Trial on Single Pilot Ops for Cargo

I thought that the space shuttle used this 2 out of 3 system as well. So there is a lot of experience with it. Space Shuttle logic employed 5 independent units. 4 were voting, fifth was resolution unit, if (and when) voting units split 2:2. What scares me off, is that it happened a few times (need ...

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by gloom
Thu Feb 18, 2021 6:54 am
Forum: Technical/Operations
Topic: Aircraft thrust
Replies: 4
Views: 1186

Re: Aircraft thrust

Where can one find a aircraft thrust rating using the aircraft tail number or Boeing serial number. Just to add extra explanation: it's possible to locate exact engine version. However, there are models where a single type (with an exchange of EEC) can change its thrust rating between a number of p...

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by gloom
Thu Feb 18, 2021 6:45 am
Forum: Technical/Operations
Topic: When did GPS become mainstream in commercial aviation?
Replies: 40
Views: 2702

Re: When did GPS become mainstream in commercial aviation?

This is false, VFR only aircraft are not GPS dependent. They are outside references dependent only hence their requirements to remain VFR. Plenty of non-IFR certified planes flying without radios and/or GPS units. What I meant was if they have lateral nav equipment. If they do, the thing is GPS dep...

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by gloom
Wed Feb 17, 2021 6:21 am
Forum: Technical/Operations
Topic: When did GPS become mainstream in commercial aviation?
Replies: 40
Views: 2702

Re: When did GPS become mainstream in commercial aviation?

Request 090 heading, direct ABC VOR when able... All using the VFR handheld, totally legal... I know the story behind, but I couldn't resist to ask. Which one requires GPS? Fly heading, or direct to? ;) Back to topic, I agree with Starlion - the core is inertial platform. It will constantly realign...

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by gloom
Tue Feb 16, 2021 12:17 pm
Forum: Technical/Operations
Topic: Can engines be too big?
Replies: 20
Views: 2633

Re: Can engines be too big?

The 787-8 could easily remove 10t of empty weight Not really. And I do not mean it cannot be done. If it would be done, it's: a) not 787 anymore, be it 8 or whatever else - not in the meaning we have now, b) it would be awfully expensive, since range of work (and certification) is close to building...

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by gloom
Mon Feb 15, 2021 6:32 am
Forum: Technical/Operations
Topic: Powering systems inside a hangar
Replies: 14
Views: 1666

Re: Powering systems inside a hangar

Just a quick add-on question. For aircraft to be powered up - do you need to switch battery on, or will external power completely do the trick? I could imagine some sort of protection on the battery circuit preventing that, but Bat/GPU running parallel with switch on each seems a simpler solution. A...

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by gloom
Fri Feb 12, 2021 6:27 am
Forum: Technical/Operations
Topic: ULH one stop
Replies: 4
Views: 1325

ULH one stop

I was wondering about ULH distances - or maybe UULH - as a side note to MEL-LHR idea from Qantas. If you can't reach destination direct, you will usually do the trip (as a passenger) with one stop. From a passenger perspective, the preferences would not be clear, as some prefer to have a longer slee...

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by gloom
Tue Feb 02, 2021 11:22 am
Forum: Technical/Operations
Topic: How do airlines decide which manufacturer to buy from
Replies: 3
Views: 1324

Re: How do airlines decide which manufacturer to buy from

The general answer I've gotten is that there are simply too many little reasons why it's one vs the other. Agreed. There is a myriad of reasons, all between performance so far, performance expected, MX cost, human cost, financial model and availability, model availability, even subjective (like wha...

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by gloom
Mon Feb 01, 2021 11:40 am
Forum: Civil Aviation
Topic: Updated: QR finds surface coating cracks in early build A350 (not structural).
Replies: 154
Views: 34697

Re: Updated: QR finds surface coating cracks in early build A350 (not structural).

Purely speculative but does Airbus want a closer look to see if there is a systemic problem? Unlikely. Since there were reports the problem is a repair derivative, I'd say hardly any reason to believe Lufthansa is coming for structure integrity chech. Plus, if Airbus wanted to check for a systemic ...

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by gloom
Sat Jan 23, 2021 7:55 am
Forum: Technical/Operations
Topic: Why do some airliners seemingly have two sets of EFBs?
Replies: 25
Views: 3109

Re: Why do some airliners seemingly have two sets of EFBs?

In a rather short time those devices will go all wireless, not have any cables to plug in. I don't expect that. You'd need to build a security zone then, electromagnetically isolated. I think it would be more like option to put a dedicated cradle for EFB. And an arm for that perhaps, so you can mov...

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by gloom
Sat Jan 23, 2021 7:47 am
Forum: Civil Aviation
Topic: QF - Project Sunrise
Replies: 345
Views: 60377

Re: QF - Project Sunrise

I was wondering about one thing. 321 and its flights on the edge of the envelope showed us a development way I don't think we've seen before. But we might see afterwards. Evolving design went from pax+cargo on regular range, then we saw ACTs, LR on Neo design, and then XLR. So basically "less c...

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by gloom
Thu Jan 21, 2021 6:14 am
Forum: Technical/Operations
Topic: Why do some airliners seemingly have two sets of EFBs?
Replies: 25
Views: 3109

Re: Why do some airliners seemingly have two sets of EFBs?

some sort of connectivity to the FMS Already happening on new bizjets like the G7500. Hi Galaxyflyer, I left only important part out of PinkMachine response. Are these just EFBs, or really plugged in to FMS? Being able to plug "anything" having right socket to FMS seems like quite a breac...

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by gloom
Wed Jan 20, 2021 2:50 pm
Forum: Technical/Operations
Topic: Why do some airliners seemingly have two sets of EFBs?
Replies: 25
Views: 3109

Re: Why do some airliners seemingly have two sets of EFBs?

thepinkmachine wrote:
I'm really looking forward to the time when manufacturers ditch their OEM EFB and provide an iPad socket instead, with some sort of connectivity to the FMS


I guess that never happens, for safety reasons. You don't want any device using specified port/socket to be able to plug in.

Cheers,
Adam

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by gloom
Sun Jan 17, 2021 11:45 am
Forum: Technical/Operations
Topic: Spped drop on climb/cruise
Replies: 3
Views: 1647

Spped drop on climb/cruise

I was wondering as a side thought on SJ182 catastrophe. Assuming the thrust is gone for any reason, while on standard climb, or in cruise, what would likely be the "reaction time"? I know there's myriad of different situations, including (or not) AP changing attitude to compensate, and the...

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by gloom
Sun Jan 17, 2021 11:36 am
Forum: Technical/Operations
Topic: “Line up and wait”
Replies: 38
Views: 3909

Re: “Line up and wait”

Fairly common across Europe. One day in Lisbon, hazy, I got that clearance only had the traffic’s lights in sight. Not a fan. There's a reason why it's so popular. Gives you shorter takeoff (some 10-20secs from rwy threshold vs runway). However, in usual conditions it is always a conditional. Usual...

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by gloom
Sat Jan 16, 2021 4:15 pm
Forum: Technical/Operations
Topic: How often do airliners perform visual approaches in good weather?
Replies: 11
Views: 1870

Re: How often do airliners perform visual approaches in good weather?

Outside North America, much less so—approaches are nearly all instrument clearances. I can only tell for Europe, still it depends very much on airport. If you have busy airport, that's easier to manage traffic in on ILS and STAR. Still, it's not that rare to hear "airport on 11 o'clock, ready ...

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by gloom
Sun Jan 10, 2021 8:03 am
Forum: Technical/Operations
Topic: 2 vs 4 engines
Replies: 128
Views: 12353

Re: 2 vs 4 engines

Starlionblue wrote:
The A340 had about 35 tonnes higher MTOW, and significantly longer range.


Original difference was even bigger. MTOW of initial versions of A330 was 212tons, 340 was maxed at 276tons. That's over 60 tons difference, almost 65.

Cheers,
Adam

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by gloom
Tue Jan 05, 2021 1:10 pm
Forum: Civil Aviation
Topic: Updated: QR finds surface coating cracks in early build A350 (not structural).
Replies: 154
Views: 34697

Re: QR finds composite cracks in early build A350

Again, you are hung up on traditional A, C, etc terminology. Sorry, have to agree with Zeke. If I found a way to split tasks usually made on C check, in a way that I do 1/6th every year, so all tasks usually done on C check are done every 6 years, but not at one time, called C (but instead I go wit...

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by gloom
Sun Dec 20, 2020 6:47 am
Forum: Technical/Operations
Topic: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area
Replies: 19
Views: 2319

Re: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area

Not to be pedantic, but I will be, your generalization is not quite true. Quite possible. I have been learned to accept "statistic are always wrong when we move to a single event". And your experience certainly allows you to know far more than I will ever learn. Still: I don't know where ...

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by gloom
Sat Dec 19, 2020 7:21 am
Forum: Technical/Operations
Topic: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area
Replies: 19
Views: 2319

Re: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area

G/S is ground speed. No increase in performance is a combination of an increased G/S as the result of winds at the higher altitude, decreased fuel flow. Close, but not yet. General rule: the higher you go, the lower GS, as speed of sound desceases - but only until ~40.000ft. Higher, the sound speed...

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by gloom
Fri Dec 18, 2020 6:29 am
Forum: Technical/Operations
Topic: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area
Replies: 19
Views: 2319

Re: Coffin Corner/High Altitude and Excess Thrust vs "Excess" Wing Area

Just curious. Which is more important for sustained high altitude flight and improving coffin corner performance? Wing area or excess thrust? Guess it was already explained a couple of times. Wing area. Thrust is already there, since you need it at takeoff. And with wings being better and better (s...

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by gloom
Wed Dec 09, 2020 9:30 pm
Forum: Technical/Operations
Topic: DL & UA on Johannesburg/JNB service aircraft performance (hot & high)
Replies: 49
Views: 7322

Re: DL & UA on Johannesburg/JNB service aircraft performance (hot & high)

By my eyeball on the Boeing ACAPs for the 787 with the high thrust engines on a standard day and dry runway the 787 can take off on the longest runway at 530 000lb or around 241T so nowhere near MTOW. ACAPS says it's even lower, I'd estimate for 237-239T (at ISA+15, approx 5500ft altitude, 14.5k ft...

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by gloom
Wed Dec 09, 2020 9:21 pm
Forum: Technical/Operations
Topic: FAA order addresses Boeing 787 localizer capture issues
Replies: 52
Views: 7635

Re: FAA order addresses Boeing 787 localizer capture issues

In the U.S. it is the 7110.65, FAA controller handbook and the paragraph I quoted above is where we (retired approach controller) had our maximum angle of intercept. For simultaneous operations to parallel runways 20 degrees is the maximum intercept angle, 30 degrees is the maximum for all other op...

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by gloom
Tue Dec 08, 2020 8:12 pm
Forum: Technical/Operations
Topic: DL & UA on Johannesburg/JNB service aircraft performance (hot & high)
Replies: 49
Views: 7322

Re: DL & UA on Johannesburg/JNB service aircraft performance (hot & high)

B789 is at most 254t. JNB it is not a problem for 789, maybe 77L and A350 can't take off at full MTOW, but certainly B789 can. Funny that Boeing seems to disagree. At 3000ft, ISA+15 you hit brake energy limit, see Boeing's ACAPS. JNB is way above. But yeah, sure, some people will never learn. :P Adam

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by gloom
Tue Dec 08, 2020 4:57 pm
Forum: Technical/Operations
Topic: FAA order addresses Boeing 787 localizer capture issues
Replies: 52
Views: 7635

Re: FAA order addresses Boeing 787 localizer capture issues

The maximum intercept angle the FAA has in the controller handbook is 30 degrees. Any word of this issue happening in the U.S.? The proper document to call would be ICAO 4444. Depending on place, it says 30deg or 45deg final approach are acceptable. By general rule, controllers will try to go below...

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by gloom
Mon Dec 07, 2020 6:57 pm
Forum: Technical/Operations
Topic: First plane that needed software?
Replies: 56
Views: 5510

Re: First plane that needed software?

The modern equivalent to what I was describing would be using VHDL on an ASIC, no CPU, once deployed just a single very fast hardware based process. Yup, ASIC was one of my mind. Still, there are some more - PLCs, custom built gate chips (civil chips we worked on were 740x series), ALUs (arithmetic...

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by gloom
Mon Dec 07, 2020 6:38 am
Forum: Technical/Operations
Topic: First plane that needed software?
Replies: 56
Views: 5510

Re: First plane that needed software?

Just a quick remark here, since OT :) Software is a set of processor instructions data which tells a computer or robot how to work. Depends on who defines. In generic, certainly you don't need processor, and telling "how to work" is misleading. Still, true for anything that is a computer s...

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by gloom
Fri Dec 04, 2020 6:24 am
Forum: Technical/Operations
Topic: Airspeed limit under a certain altitude in China
Replies: 26
Views: 3122

Re: Airspeed limit under a certain altitude in China

I think it is ridiculous. Well, I really liked the russian metric-fl realization. I think it's already ft-fl now, but for a few years when they transited from m only based altitudes, it was both disturbing and nice. You had a clear and nicely described transition (climb FL240, descend 600m). Metric...

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by gloom
Mon Nov 30, 2020 6:40 am
Forum: Technical/Operations
Topic: 777 and 787 common type rating
Replies: 26
Views: 3770

Re: 777 and 787 common type rating

Any reason the 330 and 340 are not the same type rating? They're the same plane with different engines. If I had to bet (no documents to support), I'd say it's 2 vs 4 engines. Different architecture for hydraulics, electric, resulting differences in case of abnormal procedures. Cockpit is one thing...

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by gloom
Mon Nov 30, 2020 6:36 am
Forum: Technical/Operations
Topic: Propellers/ engines on tip of wing
Replies: 19
Views: 2601

Re: Propellers/ engines on tip of wing

2. As Starlionblue pointed out, the engine might weigh a few tons, but lift in flight amounts to the entire weight of the aircraft and then some to compensate for turbulence. For the A350-900 that means 280 tons of upwards bending force. Downwards force you have the engines at 14 tons and up to 47 ...

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by gloom
Sun Nov 29, 2020 7:59 am
Forum: Technical/Operations
Topic: Propellers/ engines on tip of wing
Replies: 19
Views: 2601

Re: Propellers/ engines on tip of wing

Incorrect. It provides wing bend relief, making the wing lighter, not heavier. I would disagree here. Sure, at cruise and stable - you are right. But you get three extra difficulties there: 1. Thrust forward at the tip (not discussing vtol here, just a wingtip engine) - wing needs to keep the shape...

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by gloom
Sat Nov 28, 2020 9:49 am
Forum: Technical/Operations
Topic: Propellers/ engines on tip of wing
Replies: 19
Views: 2601

Re: Propellers/ engines on tip of wing

Behold the Vought V-173 "Flying Pancake"! Nice gem :) Still there are many more examples. MH22 obvious (also reasoning behind why wingtip powerplant are obvious), or CL-400 Suntan. There was also a VJ101, also intended as vertical takeoff. If anyone wonders why they're not popular - see t...

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by gloom
Sat Nov 21, 2020 7:02 am
Forum: Technical/Operations
Topic: Installed Engine Attitude
Replies: 32
Views: 2696

Re: Installed Engine Attitude

http://www.icas.org/ICAS_ARCHIVE/ICAS2006/PAPERS/422

For those of you interested in examples, skip to attachments.
For those of you familiar with math, the documents body is yours and only.

Cheers,
Adam
-->

Managed to find a paper I read earlier on:
http://www.icas.org/ICAS_ARCHIVE/ICAS2006/PAPERS/422

For those of you interested in examples, skip to attachments.
For those of you familiar with math, the documents body is yours and only.

Cheers,
Adam

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by gloom
Fri Nov 20, 2020 7:34 am
Forum: Technical/Operations
Topic: Installed Engine Attitude
Replies: 32
Views: 2696

Re: Installed Engine Attitude

I seem to remember an article somewhere over the net (pdf or presentation) where they discussed attitude of engine to body. There seems to be general tendency to slightly turn the engine front up, by approx 3 degs, which would be more or less the attitude of body during cruise, and I guess that's th...

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by gloom
Fri Nov 20, 2020 7:22 am
Forum: Civil Aviation
Topic: Southern Air 777-200F Near Stall/Stall at Low Altitude
Replies: 44
Views: 50123

Re: Southern Air 777-200F Near Stall/Stall at Low Altitude

Many long haul B77L and B77W pilots request 270 kts on departure before they depart, obviously speed limit is 250 below 10000 but if the plane won’t stay in the air... If for any reason they were required to keep 250 until F100/10.000, what would be the procedure? Climb on (minimum applicaple) flap...

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by gloom
Tue Nov 17, 2020 6:19 am
Forum: Technical/Operations
Topic: Can freighter aircraft supply electrical power for refrigerated cargo ?
Replies: 27
Views: 4851

Re: Can freighter aircraft supply electrical power for refrigerated cargo ?

The temperatures that Pfizer has requested are the only temperatures they have tested/certified as to retain the effectiveness of the vaccine. The vaccine could remain effective at higher temperatures just have not been tested to such. On my local TV they said -80C for long-term, standard cooling u...

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by gloom
Sat Nov 14, 2020 6:17 pm
Forum: Technical/Operations
Topic: Takeoff Power Setting on a Stretched Variant
Replies: 11
Views: 1994

Re: Takeoff Power Setting on a Stretched Variant

I’ll just say this ‘pushing the throttles all the way forward’ is not a thing on a jet transport outside of a windshear encounter or severe emergency Never on a normal take off Well, tried to be as generic as possible. I know what you talk about, but even A vs B thrust setting on reduced takeoff (a...

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by gloom
Fri Nov 13, 2020 6:32 am
Forum: Technical/Operations
Topic: Takeoff Power Setting on a Stretched Variant
Replies: 11
Views: 1994

Re: Takeoff Power Setting on a Stretched Variant

If a crew is operating a stretched variant (739, 753, 764, A333, etc.), how much higher of a power setting do they need to set if they want to rotate at the same distance down a runway as if they were in the shorter variant? Well, depends on what you ask here. Inside the cockpit, you do exactly the...

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