Search found 2578 matches

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by LH707330
Thu May 05, 2022 2:11 pm
Forum: Technical/Operations
Topic: Test-pilot combine aircracft designer
Replies: 9
Views: 857

Re: Test-pilot combine aircracft designer

Yeah, plenty of professional aero engineers build their own kitplanes and test them. If you're asking how many people at e.g. Airbus or Boeing do systems layouts and then also go and test the planes, I'm not sure.

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by LH707330
Thu May 05, 2022 2:03 pm
Forum: Technical/Operations
Topic: CFM Engine High Oil Consumption
Replies: 28
Views: 3013

Re: CFM Engine High Oil Consumption

We once had a European outstation “service” the oils on a CF6. They wrote 0 pints of oil uplifted in the logbook. It became obvious that they did not service oils to full once the plane got back to base. I'm a bit befuddled. Wouldn't the logbook entry of 0 pints make it obvious, or am I missing a t...

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by LH707330
Fri Apr 29, 2022 4:25 am
Forum: Technical/Operations
Topic: Augmented crew - logging flight hours
Replies: 28
Views: 2997

Re: Augmented crew - logging flight hours

There were guys that would bid RFO to make it easy then complain to the capt they were coming up on their 3 & 3. Then there was the issue of "hey man you knew this so why did you bid RFO? Ugly. What is a "3 & 3"? Pre-command upgrade review? People who complain like that seem ...

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by LH707330
Fri Apr 22, 2022 5:07 pm
Forum: Technical/Operations
Topic: Throttle levers on 4+ engined aircraft
Replies: 26
Views: 3540

Re: Throttle levers on 4+ engined aircraft

How many of today's engines actually regulate thrust linearly though? I know several engines use N1 as their primary parameter, and thrust scales as roughly N1^2. Do those systems linearly set N1 (so x amount of deflection gives you y amount of delta-N1)? I'd think that an old-school system with a ...

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by LH707330
Tue Apr 19, 2022 3:43 pm
Forum: Technical/Operations
Topic: Throttle levers on 4+ engined aircraft
Replies: 26
Views: 3540

Re: Throttle levers on 4+ engined aircraft

Anyway back to my original question: Why "thrust lever" and not throttle? I believe the distinction came about with computerized engine controls such as FADEC. Prior to that the throttle levers regulated the flow of fuel to the engine. With computerized controls, they regulated the percen...

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by LH707330
Fri Apr 15, 2022 8:21 pm
Forum: Technical/Operations
Topic: Aircraft positions on ground
Replies: 4
Views: 1427

Re: Aircraft positions on ground

That already exists. Even GA planes have fishfinders that show taxiing aircraft in a different format than airborne ones so you know where they are. Not that you'd want to be operating a 172 in weather so bad that you'd need something like that (where you going if engine quits...).

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by LH707330
Sun Apr 10, 2022 4:47 pm
Forum: Technical/Operations
Topic: Curious: BA Takeoff Procedures - Gear Retraction
Replies: 39
Views: 5655

Re: Curious: BA Takeoff Procedures - Gear Retraction

Thanks all, that makes sense.

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by LH707330
Thu Apr 07, 2022 12:19 pm
Forum: Technical/Operations
Topic: Curious: BA Takeoff Procedures - Gear Retraction
Replies: 39
Views: 5655

Re: Curious: BA Takeoff Procedures - Gear Retraction

Related question: to what extent does deceleration rate affect brake heating? Doesn't the same amount of energy need to get dissipated either way? The only thing I can think of that would make a big difference is using more TR or spoilers on a longer runway and thus having to do less braking.

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by LH707330
Mon Apr 04, 2022 3:07 pm
Forum: Civil Aviation
Topic: Airbus 32X NEO program: why no length adjustment?
Replies: 58
Views: 11279

Re: Airbus 32X NEO program: why no length adjustment?

Thread bump on something I've been wondering about: what factors led A and B to pick the lengths that they did? Looking back at history, I'm going to guess the following: A built the 320 as a European 727-200 replacement, and quickly realized that they could extend the range a bit and capture a lot ...

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by LH707330
Thu Mar 31, 2022 4:24 am
Forum: Technical/Operations
Topic: music/movie in cockpit on (ultra) long haul?
Replies: 20
Views: 3934

Re: music/movie in cockpit on (ultra) long haul?

This isn't a stupid question, at all. The top brands of headsets generally come with Bluetooth, and pilots of all sorts definitely do listen to music on them during non-sterile portions of flight - though that may not be strictly following the rules at some places. After that Delta MSP overflight, ...

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by LH707330
Sun Mar 27, 2022 11:42 pm
Forum: Technical/Operations
Topic: airplane gliding
Replies: 43
Views: 5068

Re: airplane gliding

The 787 glide ratio is supposedly so high it’s proprietary information. I don’t know the exact number. I assume Airbus models are equally efficient. Couldn't one infer the 787's L/D fairly accurately (+/- a few %) based on known cruise engine SFC, thrust, and burn in a variety of gross weight condi...

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by LH707330
Sun Mar 27, 2022 11:34 pm
Forum: Technical/Operations
Topic: Delta - payroll optimized luggage/overhead question
Replies: 7
Views: 2419

Re: Delta - payroll optimized luggage/overhead question

A bag in the overhead weighs nothing, since it is built into the weight of a passenger, but in the pit it counts as a bag and weighs somewhere around 30 pounds depending on what their average weight program weights are. It is fascinating how the regulations work. Sounds like the airplane may either...

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by LH707330
Mon Mar 07, 2022 10:50 pm
Forum: Technical/Operations
Topic: Cold temperatures and the flight levels
Replies: 7
Views: 1910

Re: Cold temperatures and the flight levels

Mmmm yes I'm aware everybody uses 29.92 inHg above FL180, though I'm wondering if even at that same setting do the pressure levels "condense". Basically asking if airplanes flying an IAP have to correct for cold temperatures if marked in the approach chart (and it is cold enough), does so...

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by LH707330
Mon Mar 07, 2022 6:42 pm
Forum: Technical/Operations
Topic: Cold temperatures and the flight levels
Replies: 7
Views: 1910

Re: Cold temperatures and the flight levels

Adiabatic cooling occurs as an aircraft climbs, this is due to the change in pressure. As an aircraft climbs into the flight levels all aircraft use a standardized altimeter setting to ensure separation. As an aircraft descends out of the flight levels local atmospheric pressure, from the arrival a...

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by LH707330
Fri Mar 04, 2022 4:36 am
Forum: Technical/Operations
Topic: What degree of bank angle is used by jetliners when making large wide turns?
Replies: 15
Views: 2755

Re: What degree of bank angle is used by jetliners when making large wide turns?

OP, here's a math exercise for you: watch a few of the planes turning base and final, time how long it takes, and get an approximate ground track to get the turn radius. Look up the winds aloft, and then get an idea of the airspeeds. From that, some trig: https://code7700.com/aero_turn_performance.h...

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by LH707330
Fri Mar 04, 2022 4:26 am
Forum: Technical/Operations
Topic: Right and left-handed pilots and side sticks?
Replies: 21
Views: 4222

Re: Right and left-handed pilots and side sticks?

Most CFI students, when they transition to the right seat, are able to figure it out pretty quickly. The only real issue is the steep turns, those tend to take a few flights because the sight picture looks different. As a CFI, you often seat hop a few times in a day, and it's not a real issue. Many ...

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by LH707330
Wed Feb 16, 2022 4:49 pm
Forum: Technical/Operations
Topic: Why didn't the Boeing 707 have rudder problems similar to those of the Boeing 737?
Replies: 34
Views: 5223

Re: Why didn't the Boeing 707 have rudder problems similar to those of the Boeing 737?

The original issue with the 707 rudder on the short-fin models was that it required something like 100 lb of force to move, which is why they added the taller fin, ventral fin, and boost: https://airlinercafe.com/page.php?id=72 I believe the UK regulators were going to refuse certification if they ...

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by LH707330
Mon Feb 14, 2022 4:35 pm
Forum: Technical/Operations
Topic: Why didn't the Boeing 707 have rudder problems similar to those of the Boeing 737?
Replies: 34
Views: 5223

Re: Why didn't the Boeing 707 have rudder problems similar to those of the Boeing 737?

The original issue with the 707 rudder on the short-fin models was that it required something like 100 lb of force to move, which is why they added the taller fin, ventral fin, and boost: https://airlinercafe.com/page.php?id=72 I believe the UK regulators were going to refuse certification if they d...

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by LH707330
Mon Feb 07, 2022 3:35 am
Forum: Technical/Operations
Topic: Which airliners have ram air turbines. Which power hydraulics and which provide electricity?
Replies: 46
Views: 5006

Re: Which airliners have ram air turbines. Which power hydraulics and which provide electricity?

Fun fact: the #3 A340 flap track canoes on the starboard side is longer to accommodate the RAT: https://upload.wikimedia.org/wikipedia/commons/e/ed/A340-600_clean-wing_bottom_plan-view.jpg Interesting, I would have thought the Port one would be the same size even if not required, for symmetry/drag ...

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by LH707330
Sun Feb 06, 2022 6:05 pm
Forum: Technical/Operations
Topic: Which airliners have ram air turbines. Which power hydraulics and which provide electricity?
Replies: 46
Views: 5006

Re: Which airliners have ram air turbines. Which power hydraulics and which provide electricity?

Fun fact: the #3 A340 flap track canoes on the starboard side is longer to accommodate the RAT:

Image

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by LH707330
Mon Jan 31, 2022 4:45 pm
Forum: Technical/Operations
Topic: High power settings on the 727 during approach and landing due to drag for dirty condition or for quick spool up.
Replies: 18
Views: 2549

Re: High power settings on the 727 during approach and landing due to drag for dirty condition or for quick spool up.

The high lift systems on the 727 created a ton of drag as a consequence of their high lift at low speeds, so you needed a decent amount of thrust to keep it stable. More modern aircraft have simpler systems that make less drag, and hence less thrust and noise. The DC10 was not as optimized for short...

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by LH707330
Mon Jan 31, 2022 4:35 pm
Forum: Civil Aviation
Topic: Boeing Hints at Next New Jet as It Weighs Tough Engine Decisions
Replies: 115
Views: 19517

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

The landing gears stores in the lower horizontal strut. That's a HUGE can of worms IMHO. For one, that totally changes force distribution in that lower strut, from mostly tensile to... to god knows what... No way can the gear be stored, nor be supported by the as pictured lover truss bracing. So I ...

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by LH707330
Mon Jan 24, 2022 4:34 pm
Forum: Civil Aviation
Topic: Korean Air looks to rebrand
Replies: 123
Views: 35787

Re: Korean Air looks to rebrand

Let's be honest. I think we all know what direction this rebrand is going. They probably paid millions of dollars to a design firm for something that resembles this thing I crapped out in 20 minutes. https://i.imgur.com/eHtS5rB.png Queue the Marketing Department: The new livery blends the cultural ...

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by LH707330
Thu Jan 20, 2022 9:25 pm
Forum: Civil Aviation
Topic: Boeing confirms higher gross weight 787-10
Replies: 401
Views: 68377

Re: Boeing confirms higher gross weight 787-10

I just hope Boeing can do it without sacrificing CASM at lower ranges. Me too, this is what Airbus learned when they thought they needed to HGW the A346 in response to the B77W, then only offered the HGW version Well Airbus did that (made HGW standard that is) because the A345/6 wasn’t selling and ...

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by LH707330
Thu Jan 20, 2022 5:31 am
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

Coming together nicely!

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by LH707330
Fri Jan 14, 2022 5:43 pm
Forum: Technical/Operations
Topic: Are holding patterns used very much anymore and at which airfields?
Replies: 27
Views: 3205

Re: Are holding patterns used very much anymore and at which airfields?

I’d love to see pilots raised on “glass” enter and fly an intersection hold with dual VORs. I wonder if they teach the TTTTT anymore.... lol My institution does this, ditto steam gauge needle flying. Automation suffers from GIGO (AA965, EK407), and raw-data flying suffers from math errors and instr...

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by LH707330
Thu Jan 06, 2022 5:40 pm
Forum: Civil Aviation
Topic: Boeing confirms higher gross weight 787-10
Replies: 401
Views: 68377

Re: Boeing confirms higher gross weight 787-10

I’m curious what more will need to be done to get the 787 up to 260T and beyond. I imagine thrust increases, and possibly increasing wing dimensions to keep T/O performance from getting out of hand. I think an increase in wing dimensions would help, but of course it's very costly. It's interesting ...

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by LH707330
Wed Jan 05, 2022 3:42 am
Forum: Technical/Operations
Topic: Do gate size restrictions matter for freighters
Replies: 19
Views: 2062

Re: Do gate size restrictions matter for freighters

Gate space is definitely a factor for cargo ops, especially the box haulers with big hubs like Fedex and UPS. Whenever you have a bunch of planes arrive, then rescramble the boxes and re-load them, travel times and distances to and from all the planes becomes an issue. From an efficiency standpoint,...

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by LH707330
Sun Jan 02, 2022 7:49 pm
Forum: Civil Aviation
Topic: Learjet Crash December 27 2021 in San Diego/ Gillespie - audio/video
Replies: 195
Views: 55633

Re: Learjet Crash December 27 2021 in San Diego/ Gillespie - audio/video

We all look at charts, but FAA 8260-5 is the document that is the source for the charts. https://www.faa.gov/aero_docs/acifp/NDBR/2017062233337302001-SEE-NDBR/CA_SAN%20DIEGO%20EL%20CAJON_LD_SEE_CORRECTED.pdf It references Part 97 making compliance with the approach a regulation, not just a suggesti...

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by LH707330
Sun Jan 02, 2022 5:26 pm
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

Got the first 2 revell boeing 747 I ordered yesterday. The cutaway, I'm now hesitating between British airways and SAS because british airways had a weird policy on modelling specific aircraft of their fleet in the 60', revell at the time couldn't put specific registration letters on their 200 deca...

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by LH707330
Sun Jan 02, 2022 3:57 am
Forum: Technical/Operations
Topic: Altimeters, static pressure, and lift
Replies: 48
Views: 2889

Re: Altimeters, static pressure, and lift

Anybody who thinks there are no pressure differentials on boat rudders needs to go sail a Laser dinghy. Get on a broad reach in 20 knots of breeze, let the boat heel over 30 degrees, and then pull the tiller to try and maintain course. Spoiler alert: you'll hear a "khkhkh" sound as the up...

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by LH707330
Fri Dec 31, 2021 4:55 pm
Forum: Technical/Operations
Topic: Altimeters, static pressure, and lift
Replies: 48
Views: 2889

Re: Altimeters, static pressure, and lift

Anybody who thinks there are no pressure differentials on boat rudders needs to go sail a Laser dinghy. Get on a broad reach in 20 knots of breeze, let the boat heel over 30 degrees, and then pull the tiller to try and maintain course. Spoiler alert: you'll hear a "khkhkh" sound as the upw...

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by LH707330
Tue Dec 21, 2021 11:12 pm
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

No idea, I'd give it a dark gray to make sure it's not translucent, or do a gray primer guide coat to accomplish the same.

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by LH707330
Thu Dec 16, 2021 11:46 pm
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

If you're referring to the rear door molding, that's what we in the US refer to as "engraved panel lines," as opposed to "raised panel lines" that used to be on a lot of older kits because that was easier to produce, but forced the modeler to scribe them all in afterward.

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by LH707330
Thu Dec 16, 2021 11:40 pm
Forum: Civil Aviation
Topic: United CEO Tells Senate Panel that 100 Regional Jets are Grounded Because of the Pilot Shortage
Replies: 153
Views: 16787

Re: United CEO Tells Senate Panel that 100 Regional Jets are Grounded Because of the Pilot Shortage

Let's be clear about this.... There is not a pilot shortage. There is, however, a shortage of pilots willing to fly regionals for what United wants to pay them, when so many other opportunities are available. It is not 2008, anymore. Bingo. He should go talk to his yield management team about how s...

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by LH707330
Sat Dec 11, 2021 4:11 pm
Forum: Technical/Operations
Topic: A380 lack of cargo carrying capacity versus twins
Replies: 19
Views: 3732

Re: A380 lack of cargo carrying capacity versus twins

In a nutshell: 1. Both planes are about the same length. 2. The A380 is taller/wider and thus has more taper front and rear that eats into cargo. 3. The A380 is heavier and thus has a larger wing. This wing needs to fit in an 80m box, so to get enough area, the chord is much longer, which means the ...

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by LH707330
Sat Dec 11, 2021 4:04 pm
Forum: Technical/Operations
Topic: Complicated, by design. But is it really?
Replies: 20
Views: 3786

Re: Complicated, by design. But is it really?

The first bit has already been gradually happening for decades. Very interesting, thanks! I'm not a fan of direct autoflight implementation of datalink clearances. It removes a rather significant safety net. An intermediate step, which is already happening, is automatic entry of received parameters...

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by LH707330
Wed Dec 08, 2021 6:30 am
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

Yeah, I'm running into that issue as well, got 2 747s and now starting an A340...

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by LH707330
Mon Dec 06, 2021 7:26 pm
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

Nope, I've done the Revell only, but I've heard good things about the Zvezda kit.

Pros:
1. The fans are better
2. The engines are supposedly easier to do well

Cons:
1. The WBF is too small and needs some filler
2. The Through-belly wing part forces you to assemble, then paint

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by LH707330
Sun Dec 05, 2021 7:57 pm
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

The NEO kit windows might work on the CEO model, from what I've read it's a totally different mold, so be careful and measure it first.

The Landor retrojet would look cool, I debated doing a KLM what-if 747-8i before doing a 400 instead.

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by LH707330
Sat Dec 04, 2021 1:45 am
Forum: Technical/Operations
Topic: Teal Color Inside A320neo Pratt & Whitney Engines
Replies: 27
Views: 5973

Re: Teal Color Inside A320neo Pratt & Whitney Engines

You mean it's not a mint-scent so the jet blast doesn't smell as bad ;) ? What a great idea!! LOL ;) Not sure what y'all are talking about. I love the smell of jet-a exhaust! :bouncy: I can't wait for more cooking-oil based fuels to come out. Imagine a nice warm blast of bacon smell first thing in ...

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by LH707330
Fri Dec 03, 2021 1:44 am
Forum: Civil Aviation
Topic: First Pratt A320neo Engine Update Since 2016: Disappointing?
Replies: 30
Views: 6679

Re: First Pratt A320neo Engine Update Since 2016: Disappointing?

I seem to remember that a few percentage points (3% per the 2014 article you posted) of this 5% improvement was expected to come from the engines. It was clear the GTF reliability issues delayed the fuel efficiency improvement effort. Now it appears indeed that the initial efficiency improvement of...

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by LH707330
Fri Dec 03, 2021 12:43 am
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

Looking good. Any reason you ut the flap track canoes on before painting?

Regarding the Airfix 707, I've heard it has some shape issues, you can search on airlinercafe for some threads on the topic.

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by LH707330
Tue Nov 23, 2021 1:31 am
Forum: Technical/Operations
Topic: The first ‘Electronic E6B’s’
Replies: 14
Views: 2230

Re: The first ‘Electronic E6B’s’

Hazy memory as it has been a few years, but IIRC you can do compressibility corrections on the CRP-5, which you can't on the E6B, and you need them for EASA exams. Also I found wind calculations on the CRP-5 easier, but that's more of a style thing. Compressibility is quite a useful one to have, th...

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by LH707330
Mon Nov 22, 2021 2:38 pm
Forum: Technical/Operations
Topic: The first ‘Electronic E6B’s’
Replies: 14
Views: 2230

Re: The first ‘Electronic E6B’s’

Yes, it is still taught today, unless things have changed in the past few years. If memory serves in the US I could use an electronic E6B. For the EASA exams you have to use a mechanical CRP-5 or equivalent. Electronic is not allowed, nor is a programmable calculator. If memory serves, the E6B was ...

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by LH707330
Mon Nov 22, 2021 2:16 am
Forum: Technical/Operations
Topic: The first ‘Electronic E6B’s’
Replies: 14
Views: 2230

Re: The first ‘Electronic E6B’s’

I too came from the mechanical E6B world but never used the electronic kind. Do I remember correctly that electronic E6Bs were not allowed during exams? Was it considered cheating? As a flight instructor in the late 1980s I was still teaching the manual device. Doubtful, but do student pilots still...

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by LH707330
Fri Nov 19, 2021 12:59 am
Forum: Technical/Operations
Topic: LAT/LONG - Most accurate unit measuring system in aviation?
Replies: 7
Views: 2188

Re: LAT/LONG - Most accurate unit measuring system in aviation?

What is the most accurate LAT/LONG units below for aviation? DD MM.M' or DD MM'SS" That's the precision you're after. Accuracy is how close the stated value is to the actual value. If I told you San Fransisco is "about 38N 122W," that's more accurate than saying 35 36' 42" N 123...

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by LH707330
Fri Nov 19, 2021 12:53 am
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

flipdewaf wrote:
thebunkerparodi wrote:
Image

What's that?

Fred

Looks like a marketing person standing in front of concept sketches for SAS schemes....

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by LH707330
Mon Nov 15, 2021 5:05 pm
Forum: Aviation Hobby
Topic: civilian aircraft what if
Replies: 65
Views: 13018

Re: civilian aircraft what if

Good progress! Did you get any warpage in your wings on that kit?

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