Search found 324 matches

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by Florianopolis
Sat Jun 01, 2019 11:01 pm
Forum: Technical/Operations
Topic: Can a lesser-range airplane be reconfigured to get ULH?
Replies: 13
Views: 1626

Re: Can a lesser-range airplane be reconfigured to get ULH?

I've always heard a KC-10 can go for a while.

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by Florianopolis
Sun May 26, 2019 11:40 pm
Forum: Technical/Operations
Topic: What is the dynamics or reason behind the turboprops rotating blades in opposite directions?
Replies: 22
Views: 4650

Re: What is the dynamics or reason behind the turboprops rotating blades in opposite directions?

Have we considered the possibility that they know it works, but don't know how ? When developing another quad-engine turboprop with very powerful engines, Lockheed had such a hard time getting their arms wrapped around stall on the C-130J that they just gave up and installed a stick-pusher. http://w...

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by Florianopolis
Tue Mar 12, 2019 1:04 am
Forum: Technical/Operations
Topic: Redundancy of sensors
Replies: 4
Views: 573

Re: Redundancy of sensors

Your post is actually a topic for a PhD thesis. Several, actually. Human-machine flight control and failure modes and redundancy is big stuff. If I understood it correctly FBW just replaces mechanics with electronics and is not related to the sensor redundancy. I just want to make sure we're on the ...

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by Florianopolis
Fri Feb 15, 2019 12:56 am
Forum: Technical/Operations
Topic: sterile cockpit - high altitude airports question
Replies: 24
Views: 3194

Re: sterile cockpit - high altitude airports question

The only African airline I'm familiar with (hubbed at JNB, elev 5,500) set their sterile cockpit at 15,000

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by Florianopolis
Sun Feb 03, 2019 12:27 am
Forum: Technical/Operations
Topic: Altimeter indicated altitude vs aircraft speed,bernoulli
Replies: 27
Views: 2649

Re: Altimeter indicated altitude vs aircraft speed,bernoulli

Angle of attack, sideslip, airspeed, configuration, ground effect, dynamic maneuvers . . . it all screws it up. https://apps.dtic.mil/dtic/tr/fulltext/u2/a280006.pdf (go to page 61) http://www.nasa.gov/centers/dryden/pdf/88377main_H-2044.pdf If those don't help, one of the references at the back will.

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by Florianopolis
Sun Nov 18, 2018 1:25 am
Forum: Technical/Operations
Topic: Sea Planes with retractable floats?
Replies: 6
Views: 2230

Re: Sea Planes with retractable floats?

Here's one, although it didn't float on the skis, so I guess it's more of a supersonic flying boat with retractable steps?

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by Florianopolis
Mon Nov 05, 2018 2:31 am
Forum: Technical/Operations
Topic: Crosswind Landing Technique
Replies: 11
Views: 3071

Re: Crosswind Landing Technique

You may find this interesting. http://skybrary.aero/bookshelf/books/179.pdf The gist is that crabbing until flare and then swinging it out with rudder and a bit of roll into the wind gives you the best combination of reduced loads and smallest risk of banging something important into the ground (737...

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by Florianopolis
Mon Nov 05, 2018 2:07 am
Forum: Technical/Operations
Topic: 747 APU in-flight
Replies: 12
Views: 3088

Re: 747 APU in-flight

I thought it was because four windmilling engines will provide enough hydraulics to keep flying, and the batteries are big enough to run electrics until you 1) restart an engine, or 2) reach the ground. The -8 added a RAT (for hydraulics only, I think) because windmilling its engines wouldn't keep t...

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by Florianopolis
Wed Oct 03, 2018 6:49 pm
Forum: Technical/Operations
Topic: B757 Wingtip Types
Replies: 8
Views: 2062

Re: B757 Wingtip Types

Same idea on a 737:


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by Florianopolis
Wed Sep 26, 2018 7:36 pm
Forum: Technical/Operations
Topic: What is this thing in the 747 cockpit?
Replies: 25
Views: 4054

Re: What is this thing in the 747 cockpit?

The C-17 has something like this well. theres a clear cylinder attached to the windshield divider. There is a dot on the outside and in the center there is some cross hairs. You just adjust the seat until it lines up. This was important especially with the HUD as it can affect how the data was seen...

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by Florianopolis
Sat Sep 22, 2018 7:46 pm
Forum: Technical/Operations
Topic: CN-235 Armrest Buttons
Replies: 1
Views: 673

CN-235 Armrest Buttons

Anybody know what these armrest buttons do? Seat heaters?

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by Florianopolis
Wed Sep 19, 2018 7:32 pm
Forum: Technical/Operations
Topic: Localizer when no room for antenna?
Replies: 7
Views: 1460

Re: Localizer when no room for antenna?

The most interesting use for a localizer that I've seen is in the missed approach procedure for the VOR/DME-C approach at Aspen (http://155.178.201.160/d-tpp/1810/05889LDE.PDF). This puts the actual localizer array somewhere in the skiing slopes. That is wild! http://image.ibb.co/jaG36e/Capture.jpg...

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by Florianopolis
Sat Sep 08, 2018 4:17 am
Forum: Technical/Operations
Topic: Localizer when no room for antenna?
Replies: 7
Views: 1460

Re: Localizer when no room for antenna?

Yeah, the Localizer looks like the little guy by taxiway S. It's not as wide as what you'd normally see (which I think makes it a little less precise, if I'm remembering my antenna aperture theory). Because it's not on the runway center-line, it's cranked a little bit to get the signal to extend ove...

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by Florianopolis
Tue Sep 04, 2018 4:49 pm
Forum: Technical/Operations
Topic: 767-2C lower ceiling than other 767?
Replies: 10
Views: 2009

Re: 767-2C lower ceiling than other 767?

Doesn't it have the wing of the -300 and the short fuselage of the -200? Is the -300's wing bigger? Maybe it won't descend to a safe altitude as quickly with a big wing, so you can't be as high when you start?

It could probably go much higher, but it's the requirement to get down that restricts it.

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by Florianopolis
Mon Sep 03, 2018 9:15 pm
Forum: Technical/Operations
Topic: Any aircraft with similar STOL characteristics and passenger capacity as the An-72
Replies: 27
Views: 2355

Re: Any aircraft with similar STOL characteristics and passenger capacity as the An-72

NASA put jets on a deHavilland C-8A Buffalo...but that's substantially smaller than the An-72. (Google "NASA QSRA" if you're interested) http://upload.wikimedia.org/wikipedia/commons/8/8f/NASA_QSRA.jpg Even flew it off an aircraft carrier! http://www.youtube.com/watch?v=k_eDutgh4IU For som...

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by Florianopolis
Sun Sep 02, 2018 5:33 pm
Forum: Technical/Operations
Topic: AN-12 Cargo Aircraft Crew?
Replies: 15
Views: 2183

Re: AN-12 Cargo Aircraft Crew?

727200 wrote:
Is that the socialistic view of giving people a job? He only steers the plane? I wont even comment on the lack of efficiency on this.


Tough union contracts.

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by Florianopolis
Fri Aug 31, 2018 11:23 pm
Forum: Technical/Operations
Topic: Why Anhedral with fly by wire?
Replies: 23
Views: 1810

Re: Why Anhedral with fly by wire?

Fact is the high wing cargo planes have an anhedral because the CG is much lower than the lift vector. With a CG below the wing you inherently gain better roll stability. Think of a pendulum. It wants to return back to its normal resting state. An anhedral wing reduces this some by introducing more...

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by Florianopolis
Sat Aug 25, 2018 10:45 pm
Forum: Technical/Operations
Topic: Couple of go-around questions
Replies: 28
Views: 3892

Re: Couple of go-around questions

The airplane might also drop a dime on you if you should have gone around, but did not.

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by Florianopolis
Wed Aug 15, 2018 3:09 am
Forum: Technical/Operations
Topic: 767 crosswind T/O and Landing
Replies: 6
Views: 1300

Re: 767 crosswind T/O and Landing

Starlionblue wrote:

The standard arrangement seems to be that the VOR receivers live in the top of the fin, while the LOC and G/S receivers live in the lower part of the nose.


Wow that's a lot of pictures. Thanks!

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by Florianopolis
Tue Aug 14, 2018 5:59 pm
Forum: Technical/Operations
Topic: 767 crosswind T/O and Landing
Replies: 6
Views: 1300

Re: 767 crosswind T/O and Landing

Does the localizer / VOR antenna live in the nose or tail?

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by Florianopolis
Fri Aug 10, 2018 6:00 pm
Forum: Technical/Operations
Topic: V1 question
Replies: 18
Views: 1837

Re: V1 question

http://www.ntsb.gov/_layouts/ntsb.aviat ... 081&akey=1
-->

kalvado wrote:
But don't try that with a jet...


Sometimes they do...
http://www.ntsb.gov/_layouts/ntsb.aviat ... 081&akey=1

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by Florianopolis
Mon Jul 30, 2018 9:11 pm
Forum: Technical/Operations
Topic: Packs and Supplementary Air Supplies
Replies: 13
Views: 1007

Re: Packs and Supplementary Air Supplies

Is this hooked up to the HP engine start air source, and routed to the pacs instead of to the engine starter? Or is there a separate HP air hookup for PAC feed air, in addition to the fat yellow hoses that hookup air conditioned air right to the distribution system downstream of the PACs?

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by Florianopolis
Fri Jul 13, 2018 10:27 pm
Forum: Technical/Operations
Topic: A330 Nose Landing Gear
Replies: 4
Views: 1179

Re: A330 Nose Landing Gear

I have guesses, in decreasing confidence order: 1) When retracting the gear with a shredded tire, the spinning tire bits will hit those bars as the gear retracts, reducing damage to all the stuff in the wheel well. 2) A maintenance jig or something hangs on it. Or it's part of the nose gear position...

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by Florianopolis
Fri Jul 06, 2018 11:06 pm
Forum: Technical/Operations
Topic: P-8 Poseidon raked wingtip
Replies: 15
Views: 2419

Re: P-8 Poseidon raked wingtip

Anti-icing on your typical 737NG ends at the penultimate slat section. That's okay for an airliner, which doesn't spend much time in icing conditions. Airliners live at cruise altitudes, and are only going through icing for a minute or two on their way up and down. But a maritime patrol airplane wi...

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by Florianopolis
Fri Jul 06, 2018 5:01 pm
Forum: Technical/Operations
Topic: P-8 Poseidon raked wingtip
Replies: 15
Views: 2419

Re: P-8 Poseidon raked wingtip

Anti-icing on your typical 737NG ends at the penultimate slat section. That's okay for an airliner, which doesn't spend much time in icing conditions. Airliners live at cruise altitudes, and are only going through icing for a minute or two on their way up and down. But a maritime patrol airplane wil...

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by Florianopolis
Fri Jul 06, 2018 6:17 am
Forum: Civil Aviation
Topic: Aeroflot TU-104 next to UA DC-7: where?
Replies: 10
Views: 3211

Re: Aeroflot TU-104 next to UA DC-7: where?

I'm going with the 1958 Vancouver Airshow . http://basininstitute.org/home/image.html?zn=7&id=8911b43f97f9e9d0c5f524d24c75f634 http://basininstitute.org/search/details.html?id=58254 Here's a fun story about that airshow: http://www.henrytenby.com/aeroflot-tu-104-visit-to-vancouver-airshow-sunday...

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by Florianopolis
Sun Jul 01, 2018 2:55 am
Forum: Technical/Operations
Topic: Boeings and Krueger/VCFs (diagram pics)
Replies: 14
Views: 1573

Re: Boeings and Krueger/VCFs (diagram pics)

Another thing to consider, without going too off topic - you'd prefer a swept wing to stall at the root first, and you'll see lots of design nuances to help that happen. On the A380, for example, the leading edge devices between the fuselage and inboard engine have no gap, they just droop.

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by Florianopolis
Sun Jun 24, 2018 1:39 am
Forum: Technical/Operations
Topic: What makes the engine physically go faster?
Replies: 17
Views: 1779

Re: What makes the engine physically go faster?

lightsaber wrote:
Going from flight idle to full throttle does many takeoffs of damage to the engine to accelerate the availability of thrust.


Is a go-around worse for the engine than a takeoff?

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by Florianopolis
Sat Jun 23, 2018 3:34 pm
Forum: Technical/Operations
Topic: Typical pre-delivery squawks
Replies: 15
Views: 2062

Re: Typical pre-delivery squawks

7BOEING7 wrote:
The Boeing factories in Renton (727,737,757) & Everett (747,767,777,787) generally get it right 99%+ of the time


Hold on. So you're saying Kansas and South Carolina aren't as good?

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by Florianopolis
Thu Jun 21, 2018 10:38 pm
Forum: Technical/Operations
Topic: 1938 Boston Airport Operations
Replies: 5
Views: 822

Re: 1938 Boston Airport Operations

double post....
...

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by Florianopolis
Thu Jun 21, 2018 10:37 pm
Forum: Technical/Operations
Topic: 1938 Boston Airport Operations
Replies: 5
Views: 822

Re: 1938 Boston Airport Operations

It's not grass, but cinder, piled up on the marshland and tidal flats to create a usable airfield. Actual runways weren't really a thing for the first 40 years of aviation. Airplanes weren't heavy enough to need pavement, and you always wanted to takeoff and land into the wind. Here's a picture of t...

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by Florianopolis
Tue Jun 19, 2018 3:08 am
Forum: Technical/Operations
Topic: What happens with international delayed checked baggage?
Replies: 16
Views: 2710

Re: What happens with international delayed checked baggage?

x1234 wrote:
It will still travel to its final destination correct!?


The bag will catch up to you, eventually. But depending on where it sits while it waits to catch up to you, the odds of anything valuable in the bag still being in it when you get it go down dramatically.

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by Florianopolis
Wed Jun 13, 2018 4:28 pm
Forum: Technical/Operations
Topic: Is fewer fan blades better?
Replies: 18
Views: 2708

Re: Is fewer fan blades better?

Balerit wrote:
Just look at how the aspect ratio has changed.


Isn't a high-aspect airfoil better, though?

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by Florianopolis
Tue Jun 12, 2018 7:43 pm
Forum: Technical/Operations
Topic: Is fewer fan blades better?
Replies: 18
Views: 2708

Re: Is fewer fan blades better?

But turboprops have been sprouting more propellers?

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by Florianopolis
Mon Jun 04, 2018 5:02 pm
Forum: Technical/Operations
Topic: Would a large prop plane designed today look the same?
Replies: 21
Views: 4066

Re: Would a large prop plane designed today look the same?

I live near ANC, which may well be one of the best places in the world for plane-spotting. We still fly DC-6 aircraft up here, along with a few Grummans, and there are a host of airframes within easy driving distances stretching from the C-119 to a AN-2 being restored. Looking at all these old prop...

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by Florianopolis
Sun May 13, 2018 4:39 am
Forum: Technical/Operations
Topic: "Heavy" designation for enroute aircraft
Replies: 10
Views: 2491

Re: "Heavy" designation for enroute aircraft

I watched Air Force One land and had Live ATC going. They actually did use "Air Force One heavy" as the call sign; it was the VC-25. I'm assuming you mean the controller, not the A1 pilots? I'm pretty sure the "no "heavy" for AF1" rule happened because hearing "Ai...

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by Florianopolis
Thu May 10, 2018 4:08 pm
Forum: Technical/Operations
Topic: Maneuvering Speed
Replies: 7
Views: 1408

Re: Maneuvering Speed

I think the replies all get it, but everyone's saying it differently. Pull back on your controls when you're flying below Maneuvering Speed, and the airplane stalls before the wings rip off. But Va makes no promises about any other parts of the airplane, or for maneuvers in more dimensions. See if t...

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by Florianopolis
Mon May 07, 2018 1:58 am
Forum: Technical/Operations
Topic: "Heavy" designation for enroute aircraft
Replies: 10
Views: 2491

Re: "Heavy" designation for enroute aircraft

While that’s the correct answer, there have been enroute wake incidents, including loss of control, where foreknowledge of “heavy” converging with light or medium wake category planes might have alerted the pilots to offset. Even in a C-5 passing an opposite direction 747 once caused me a memorable...

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by Florianopolis
Sun May 06, 2018 11:51 pm
Forum: Technical/Operations
Topic: "Heavy" designation for enroute aircraft
Replies: 10
Views: 2491

Re: "Heavy" designation for enroute aircraft

At least in the USA (and really, what else matters?): The word "heavy" shall be used as part of the identification of heavy jet aircraft as follow: TERMINAL: In all communications with or about heavy jet aircraft. EN ROUTE: The use of the word heavy may be omitted except as follows: a. In ...

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by Florianopolis
Wed Apr 11, 2018 8:47 pm
Forum: Non-Aviation
Topic: What if 9/11 hijackers got on airbus planes?
Replies: 39
Views: 4400

Re: What if 9/11 hijackers got on airbus planes?

I understand that they were training only on boeing and only had their manuals but what if they got substituted with say A321 or A330? Would they still know how to crash them or would they abort their plans so to speak? They wouldn't have been able to go as fast as they did without the airplane int...

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by Florianopolis
Thu Apr 05, 2018 3:32 am
Forum: Technical/Operations
Topic: Airlines whose flights begin or terminate at one airport only
Replies: 38
Views: 3023

Re: Airlines whose flights begin or terminate at one airport only

Independence Air (remember them?) was like that. Every flight was to or from IAD.

(With one exception. For some reason there was an IAD-TYS-MCO-IAD flight. I never figured out what the deal was with that one.)

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by Florianopolis
Tue Apr 03, 2018 3:29 am
Forum: Technical/Operations
Topic: No more prototypes
Replies: 9
Views: 986

Re: No more prototypes

My smart-aleck answer is that the first 100 F-35s and first 50 787s were the prototypes.

But seriously, all I can think of are smaller manufacturers with business jets and general aviation airplanes. The allure of concurrent testing and production is just too compelling.

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by Florianopolis
Sun Apr 01, 2018 2:43 am
Forum: Technical/Operations
Topic: Better way to load freighters
Replies: 62
Views: 3512

Re: Better way to load freighters

So you lower the wings into the ground as well? Or are we folding them like on a carrier? At a gate, a rectangular area in the ramp and large enough for the entire a/c is lowered, just like an elevator on a naval aircraft carrier. When the cargo door lip is at ground level, the lowering stops, and ...

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by Florianopolis
Wed Mar 28, 2018 2:35 am
Forum: Technical/Operations
Topic: Last moments of a crosswind landing
Replies: 19
Views: 1594

Re: Last moments of a crosswind landing

Is there a need (or best practice) to snap a landing plane into straight-head flight just before touching down on one of those sideways-crabbing crosswind landings, or is there enough "give" built into the main landing gear to absorb that kind of off-center force? Thanks. There's also the...

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by Florianopolis
Tue Mar 27, 2018 5:27 am
Forum: Technical/Operations
Topic: Last moments of a crosswind landing
Replies: 19
Views: 1594

Re: Last moments of a crosswind landing

Actually I'm totally trimming for airspeed and using thrust to maintain glideslope when I'm hand flying a 737. It's not that far from being a huge 182. Yeah, I was just clumsily making this same point from an old Boeing Aero article on AOA. Please forgive me, as english is my first language. It's j...

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by Florianopolis
Tue Mar 27, 2018 1:28 am
Forum: Technical/Operations
Topic: Last moments of a crosswind landing
Replies: 19
Views: 1594

Re: Last moments of a crosswind landing

A lot of modern airliners don't have the wingtip and engine clearance to land in a steady sideslip tracking the runway centerline at their max crosswind limits without coming very very close to scraping something other than tires on the ground. In other words, that technique you learned in your high...

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by Florianopolis
Thu Mar 15, 2018 2:03 am
Forum: Technical/Operations
Topic: How Temperature affects flight level
Replies: 10
Views: 1298

Re: How Temperature affects flight level

Starlionblue wrote:
Or I might just have woken up and am not accurately remembering basic theory. The world is so fuzzy before my first cup of coffee... #makingexcuses


Don't worry. The quickest way to get a correct answer around here is to post an incorrect answer first.

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by Florianopolis
Mon Mar 12, 2018 8:56 pm
Forum: Technical/Operations
Topic: Boeing 707-320B vs. Airbus 321LR: an unfair comparison.
Replies: 34
Views: 4342

Re: Boeing 707-320B vs. Airbus 321LR: an unfair comparison.

Paint a 60-year old 707 in a modern livery and roll it up to a gate: I expect that only a small minority of the waiting passenger would notice that something is different ("Hey look, it has four engines!"). Fact Check? True :checkmark: :checkmark: 2008713,26764 A more apt comparison than ...

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