Search found 240 matches

by benbeny
Sat May 06, 2017 1:12 pm
Forum: Civil Aviation
Topic: Boeing 737 MAX Production Thread - Part 1
Replies: 846
Views: 257841

Re: Boeing 737 MAX Production Thread - Part 1

So I presume FAA almost give it green light for commercial flights?

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by benbeny
Thu Apr 27, 2017 6:30 pm
Forum: Technical/Operations
Topic: Air-to-air refuelling; what about wake turbulence?
Replies: 20
Views: 4073

Re: Air-to-air refuelling; what about wake turbulence?

It's interesting to see how people manage to fly something so big so close to another flying objects. Is it easier to refuel with boom, or drogue system?

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by benbeny
Thu Apr 27, 2017 6:26 pm
Forum: Technical/Operations
Topic: Engine out lateral trim
Replies: 7
Views: 1024

Engine out lateral trim

I hope this is not a stupid question. If I understand correctly, until now in case of engine out pilots keep fuel evenly balanced and trim with rudder and aileron. Why don'r anyone design fuel system as lateral trim in case of an engine out, so instead of adding drag from trim, fuel is utilized as t...

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by benbeny
Thu Apr 27, 2017 8:10 am
Forum: Civil Aviation
Topic: Aircraft Values, And Lease Pricing - Spring 2017
Replies: 51
Views: 55391

Re: Aircraft Values, And Lease Pricing - Spring 2017

I look forward to this thread more than any other. Thank you for posting! Well, now you can buy 77E with as little money as A320 or B738. I wonder will any airlines trying to spread its wings take this offer. It's interesting to see that A330 has stronger market potential than 77E or 744/748. Thank...

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by benbeny
Wed Apr 26, 2017 3:01 pm
Forum: Technical/Operations
Topic: Air-to-air refuelling; what about wake turbulence?
Replies: 20
Views: 4073

Re: Air-to-air refuelling; what about wake turbulence?

I've heard some pilots at the receiver end prefer to offset it a bit left or right for smoother and easier flying. Is it true?

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by benbeny
Wed Apr 26, 2017 2:48 pm
Forum: Technical/Operations
Topic: Why didn't Boeing create a 318/319/320/321 series?
Replies: 17
Views: 2749

Re: Why didn't Boeing create a 318/319/320/321 series?

My understanding is that 737 classic/NG/MAX have (will have) common type ratings for all variants. I might be wrong though

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by benbeny
Wed Apr 26, 2017 2:27 pm
Forum: Technical/Operations
Topic: Aerodynamics...
Replies: 11
Views: 1937

Re: Aerodynamics...

But the flying wing or BWB is far more aerodynamic than a cigar with wings. Exactly. Current military incarnations of the flying wing are a compromise between fuel efficiency, the need for stealth, and the ability to carry large payloads. A basic flying wing with no stealth requirements will always...

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by benbeny
Tue Apr 25, 2017 11:12 am
Forum: Travel, Polls & Preferences
Topic: Airport Codes that make little sense
Replies: 63
Views: 4602

Re: Airport Codes that make little sense

AMQ is Ambon, I think Q is just the filler.
PEK makes little sense until you remember that Beijing used to be called Peking.
Mumbai (BOM) came from the old name, Bombay; like Kolkatta (CCU) came from Calcutta.

I don't know, I like RUH (Riyadh). It means 'spirit'.

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by benbeny
Mon Apr 24, 2017 6:34 am
Forum: Travel, Polls & Preferences
Topic: Airport Codes that make little sense
Replies: 63
Views: 4602

Re: Airport Codes that make little sense

What about Groningen (GRQ)? The GR I can understand, that stands for GRoningen. But where does the Q come from? Cause GRO is Girona, Spain; GRN is Gordon Municipal, USA; GRI is Central Nebraska, USA; GRG is Gardez, Pakistan; and GRE is Greenville Municipal, USA. So, there's not much option left. Wh...

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by benbeny
Mon Apr 24, 2017 6:30 am
Forum: Civil Aviation
Topic: a318neo ?
Replies: 34
Views: 7582

Re: a318neo ?

It seems like their would be a market for it. After all, they will eventually need new planes for London City to New York. A more efficient 318neo could make a host of new flights to financial centers viable. LON-ORD, LON-MKE, LON-HKG, LON-SIN could come to fruition. A 757max is the other option fo...

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by benbeny
Sun Apr 23, 2017 4:01 pm
Forum: Technical/Operations
Topic: Aerodynamics...
Replies: 11
Views: 1937

Re: Aerodynamics...

And you need to design it so you can further refine it in the future, when the demand is there. It's a compromise. Likewise, 737 cockpit is a head-banger, but you need to keep it for commonality purpose. Behind those panels may come so many structural things that you cannot change, or too expensive ...

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by benbeny
Sun Apr 23, 2017 2:57 pm
Forum: Civil Aviation
Topic: a318neo ?
Replies: 34
Views: 7582

Re: a318neo ?

Why do they need to? They must face competition from at least CRJ, ERJ, MRJ, COMAC, SuperJet, ATR, Q400. I agree, they finally realized that A318 and B736 isn't a sound business plan and someone else has better product suited for that niche, so they better focus on duopoly currently held on 120-220 ...

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by benbeny
Sun Apr 23, 2017 12:15 pm
Forum: Technical/Operations
Topic: Time for departure on time
Replies: 12
Views: 1678

Re: Time for departure on time

So what can be considered as 'on time'? If I read above, it's -/+ 5 mins. Am I correct?

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by benbeny
Sun Apr 23, 2017 11:39 am
Forum: Technical/Operations
Topic: Engine Windmilling on the Ramp
Replies: 32
Views: 5893

Re: Engine Windmilling on the Ramp

Is there any side effects for engines windmilling? How bad is that, and why don't they put brakes to stop it from rotating?

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by benbeny
Sun Apr 23, 2017 11:32 am
Forum: Trip Reports
Topic: Heading to New Zealand on Qatar Airways - DOH-AKL on the 777-200LR in Business Class
Replies: 5
Views: 7541

Re: Heading to New Zealand on Qatar Airways - DOH-AKL on the 777-200LR in Business Class

Nice trip report! It must be fun to have an empty seat beside you.
They seemed to be very attentive too, which is a good thing.
And I like the cabin, not much bling bling, unlike that one gulf carrier.

How is it compared to another gulf carriers?

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by benbeny
Sun Apr 23, 2017 11:23 am
Forum: Civil Aviation
Topic: Payback period for airliners and bizjets?
Replies: 0
Views: 328

Payback period for airliners and bizjets?

What's the normal term for payback period for jetliners and bizjets?
Because this area is so mysterious for me.
Thank you

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by benbeny
Sun Apr 23, 2017 11:16 am
Forum: Civil Aviation
Topic: 13 hours on a G650
Replies: 20
Views: 7121

Re: 13 hours on a G650

That bird (quoting OP) has N-registration, so I assume it must have 2 crews.
It must be boring, floating for 13 hours, seeing nothing.
And I assume it had nice tailwind along the way, they might not be able to return nonstop, except if they go the other way round.

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by benbeny
Sun Apr 23, 2017 11:09 am
Forum: Civil Aviation
Topic: Aircraft Values, And Lease Pricing - Spring 2017
Replies: 51
Views: 55391

Re: Aircraft Values, And Lease Pricing - Spring 2017

Well, now you can buy 77E with as little money as A320 or B738. I wonder will any airlines trying to spread its wings take this offer. It's interesting to see that A330 has stronger market potential than 77E or 744/748. Thank you for posting this data, it's always interesting. By the way, do you hav...

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by benbeny
Tue Apr 04, 2017 10:34 am
Forum: Technical/Operations
Topic: Question about windows fogging up after landing
Replies: 4
Views: 1338

Re: Question about windows fogging up after landing

I rarely seen that though I live in tropical country where everything is humid year long... does the relative humidity play a factor there?

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by benbeny
Mon Apr 03, 2017 2:04 pm
Forum: Civil Aviation
Topic: Boeing 737 MAX Production Thread - Part 1
Replies: 846
Views: 257841

Re: Boeing 737 MAX Production Thread - Part 1

Will the first flight 739 become first operational 739? Are you talking about the first to enter service? Most likely not but will eventually be delivered to an airline after the test campaign is done and it has went through refurbishment. Yes, I'm talking about the first who enter service. Thanks ...

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by benbeny
Sun Apr 02, 2017 2:08 pm
Forum: Civil Aviation
Topic: Boeing 737 MAX Production Thread - Part 1
Replies: 846
Views: 257841

Re: Boeing 737 MAX Production Thread - Part 1

Will the first flight 739 become first operational 739?

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by benbeny
Thu Mar 30, 2017 8:18 am
Forum: Technical/Operations
Topic: A vs B engine pylons
Replies: 10
Views: 1836

Re: A vs B engine pylons

Moving the engine closer to the wing is optimizing for weight over aerodynamics. This benefits climb and thus shorter missions. The cost is getting the laminar flow around the engines just right. Close to the wing mounted engines suffer more drag with dirt and dings, so the nacelle maintenance cost...

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by benbeny
Thu Mar 30, 2017 8:15 am
Forum: Technical/Operations
Topic: B747F at FL450?!
Replies: 28
Views: 7986

Re: B747F at FL450?!

That's where business jets lingers :o
Anyway, if you have better wind up there but your optimal cruise is lower, do you climb or stay on the current altitude (considering you're capable, anyway)?

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by benbeny
Thu Mar 30, 2017 8:09 am
Forum: Technical/Operations
Topic: MD11 Landing, So Much Flaps?
Replies: 46
Views: 21837

Re: MD11 Landing, So Much Flaps?

I remember reading somewhere that 707 doesn't have slats but capable of flaps 50... is the high lift design matter?

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by benbeny
Sun Mar 26, 2017 9:44 am
Forum: Technical/Operations
Topic: Smallest Cat III Landing Capeable Aircraft?
Replies: 26
Views: 4683

Re: Smallest Cat III Landing Capeable Aircraft?

flight into known icing... i guess i must be spending too much time in general aviation forum then :D

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by benbeny
Fri Mar 24, 2017 12:05 pm
Forum: Travel, Polls & Preferences
Topic: Why are you an Airbus or Boeing fan ?
Replies: 17
Views: 1537

Re: Why are you an Airbus or Boeing fan ?

I don't like AB, because of their control laws (not that I'm saying they're less safe, just different). Besides, I like 707-727-737 nose section.

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by benbeny
Fri Mar 24, 2017 12:02 pm
Forum: Technical/Operations
Topic: Are Airlines paying a Maintenance Fee to Airbus, Boeing & Co
Replies: 7
Views: 1981

Re: Are Airlines paying a Maintenance Fee to Airbus, Boeing & Co

So basically if the development cost went out of the roof (like what happened on 787), manufacturers are still hoping to make some good chunks of profit by their tech support and documentations?

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by benbeny
Fri Mar 24, 2017 9:52 am
Forum: Civil Aviation
Topic: Boeing 737 MAX Production Thread - Part 1
Replies: 846
Views: 257841

Re: Boeing 737 MAX Production Thread - Part 1

Slightly out of topic, does anyone know how much thrust lost by installing those chevrons?

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by benbeny
Fri Mar 24, 2017 9:49 am
Forum: Technical/Operations
Topic: Smallest Cat III Landing Capeable Aircraft?
Replies: 26
Views: 4683

Re: Smallest Cat III Landing Capeable Aircraft?

Fabo wrote:
Fail op is an option on NG. Dunno about Max. It's quite rare though.

@benbeny: I don't think so. Icing is hit or miss, but winds tend to be quite calm in CAT III weather.

I stand corrected. But I still think that FIKI at least is important for cat III to utilize its full potential

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by benbeny
Fri Mar 24, 2017 9:46 am
Forum: Technical/Operations
Topic: Why Is There Only One Rudder in an Aircraft?
Replies: 23
Views: 3536

Re: Why Is There Only One Rudder in an Aircraft?

as usual, everything comes to a tradeoff. will people buy a plane with shorter height but heavier structure, or will people buy taller plane with better aerodynamics efficiency? anyway, boeing chose solved the hangar height problem of stratocruiser by making complex and heavy folding mechanism inste...

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by benbeny
Fri Mar 24, 2017 9:41 am
Forum: Civil Aviation
Topic: Time for a A300NEO?
Replies: 118
Views: 21142

Re: Time for a A300NEO?

good point, but if you shorten the fuselage, doesnt that mean you need to increase tail size?

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by benbeny
Mon Mar 20, 2017 3:24 am
Forum: Technical/Operations
Topic: Why Is There Only One Rudder in an Aircraft?
Replies: 23
Views: 3536

Re: Why Is There Only One Rudder in an Aircraft?

Actually, every rudder induces torque to airframe part it sits. You cannot turn airplane with rudder without torque exerted from the rudder.

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by benbeny
Mon Mar 20, 2017 3:05 am
Forum: Technical/Operations
Topic: Smallest Cat III Landing Capeable Aircraft?
Replies: 26
Views: 4683

Re: Smallest Cat III Landing Capeable Aircraft?

One more thing: cause autoland is usually needed on bad weather with high wind and probable icing condition, you'll at least need FIKI to use the full potential.

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by benbeny
Wed Mar 08, 2017 3:29 am
Forum: Civil Aviation
Topic: Airbus A330neo production and delivery thread - 2016-2017
Replies: 759
Views: 241653

Re: A330 NEO Production And Delivery Thread Part 1

It's amazing how late 60s design can still compete fiercely with a design from the new millennia... I'm wondering when will they kill that A300 design eventually? When Airbus has money to create another mid range widebody, perhaps?

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by benbeny
Tue Mar 07, 2017 2:47 pm
Forum: Technical/Operations
Topic: Modern Radial Engine Operators
Replies: 7
Views: 1823

Re: Modern Radial Engine Operators

Didn't Breitling still offers excursion tour with their super connies? Breitling has DC-3 too (if that qualifies as company operating radials)...
I think some CL-215 is still on operation, they're turboprop version of CL-415, major firefighting plane worldwide and a descendant from PBY Catalina.

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by benbeny
Tue Mar 07, 2017 2:35 pm
Forum: Technical/Operations
Topic: 737-800 Middair Reverse Thrust?
Replies: 16
Views: 8389

Re: 737-800 Middair Reverse Thrust?

I think, although it is possible in flight less than 10' RA (idle reverse only), it makes your plane unsafe for go around (IIRC Boeing explicitly states that landing after thrust reverser deployment is mandatory) because if you have unlocked TR that is unlocked during go around that spells a big dis...

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by benbeny
Tue Mar 07, 2017 1:37 pm
Forum: Technical/Operations
Topic: Way off the centerline on approach?
Replies: 6
Views: 1668

Re: Way off the centerline on approach?

Often the VOR or NDB were located next to the runway, they cannot be on the runway as you would hit it on takeoff or landing. It is the physical offset of the ground transmitter from the runway that results in a slightly offset final approach path, as the aircraft is tracking to the transmitter. So...

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by benbeny
Wed Feb 22, 2017 3:50 am
Forum: Technical/Operations
Topic: round hole opening on left side of the DC-10
Replies: 8
Views: 2567

Re: round hole opening on left side of the DC-10

There are actually three parts to the pressurization outflow on the DC-10. A deflector, the large butterfly valve, and a second thrust recovery jet valve. You might notice that on the MD-11, this has been reduced to a single outflow valve. This change was also incorporated in the MD-10 conversion f...

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by benbeny
Thu Feb 09, 2017 2:20 pm
Forum: Technical/Operations
Topic: Landing Gear Not Deployed Warning
Replies: 24
Views: 12126

Re: Landing Gear Not Deployed Warning

Holy thread resurrection :o :o :o
BTW because sometimes the regulation changes after some incidents, does anybody remember when was it applied and what incident triggered the mandatory gear down warning?

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by benbeny
Tue Feb 07, 2017 3:22 pm
Forum: Technical/Operations
Topic: Will single engine designs be viable in the future?
Replies: 33
Views: 3684

Re: Will single engine designs be viable in the future?

A widely popular commercial single engine plane is An-2. How do the reliability records of An-2s with piston engines compare against An-2s with turbopropellers? difficult to tell. not many An-3 around ~35 ? ( versus 18,000 An-2 :-) Ah, the mighty R-1820, a design dated from 1920s and still in produ...

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by benbeny
Sun Feb 05, 2017 2:37 pm
Forum: Technical/Operations
Topic: Boeing Customer Code 20
Replies: 7
Views: 1404

Re: Boeing Customer Code 20

I think so.

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by benbeny
Sat Feb 04, 2017 4:39 pm
Forum: Technical/Operations
Topic: Couple questions about the B737
Replies: 13
Views: 2405

Re: Couple questions about the B737

So if we able to make the rudder to kick in automatically during crosswind or during engine failure, then we are able to get rid of the rudder pedal?

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by benbeny
Sat Feb 04, 2017 4:22 pm
Forum: Technical/Operations
Topic: Boeing Customer Code 20
Replies: 7
Views: 1404

Re: Boeing Customer Code 20

IIRC customer code 20 was (is?) skipped because the original 707 model was 707-120, hence the customer code for 7x7 series started with 21 (PA)

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by benbeny
Sat Feb 04, 2017 4:17 pm
Forum: Technical/Operations
Topic: Sidestick controllers
Replies: 46
Views: 4740

Re: Sidestick controllers

What's really surprising is Gulfstream. They refuse to change from yoke to sidestick on their first FBW, G650 and now they seem to actively promote the advantage of G5/600 sidesticks. Any thoughts on this?

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by benbeny
Sat Feb 04, 2017 4:07 pm
Forum: Technical/Operations
Topic: Will single engine designs be viable in the future?
Replies: 33
Views: 3684

Re: Will single engine designs be viable in the future?

I don't think that gonna happen. Just imagine how public perceives single engine for TATL. Although we have single engined fighters flying for decades with very high requirements (high G load, rapid acceleration/deceleration, high temperature margin), fighters tend to fly far less than commercial je...

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by benbeny
Sat Feb 04, 2017 3:44 pm
Forum: Civil Aviation
Topic: Norwegian to become 1st 737 MAX operator?
Replies: 42
Views: 11290

Re: Norwegian to become 1st 737 MAX operator?

By the way, when will 737NG production ends based on current order, and have they closed the order book?

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by benbeny
Sun Jan 29, 2017 5:04 pm
Forum: Technical/Operations
Topic: FORMULA QUESTION
Replies: 3
Views: 1068

Re: FORMULA QUESTION

Well, if you can calculate deceleration speed for autobrake, you can calculate V1 pretty easily. Open up your takeoff-stop distance, subtract your 0-V1 distance, and you get V1-stop distance. Use Newtonian equation, and you got your deceleration rate. Assuming deceleration rate is constant across th...

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by benbeny
Sun Jan 29, 2017 4:44 pm
Forum: Technical/Operations
Topic: Are life rafts and vests really needed on commercial aircraft?
Replies: 82
Views: 6465

Re: Are life rafts and vests really needed on commercial aircraft?

Very interesting opinions... Let me say this: why must new cars be equipped with airbags? Afterall, seatbelt is the main restraining tool and the individual risk of crashing somewhere is so low, you'll be unlikely to be involved in any fatal crash during your lifetime, besides there's always a chanc...

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by benbeny
Sun Jan 29, 2017 4:15 pm
Forum: Technical/Operations
Topic: Air Crash Clean Up
Replies: 6
Views: 2193

Re: Air Crash Clean Up

http://i2.cdn.cnn.com/cnnnext/dam/assets/130619083542-07-twa-0619-horizontal-large-gallery.jpg In the case of TWA 800, they fished it out of the water and put it back together. Quite eerie I must admit, but absolutely incredible as well. IIRC used by NTSB for crash investigation training, right?

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by benbeny
Sun Jan 29, 2017 1:46 pm
Forum: Civil Aviation
Topic: Boeing 737 MAX Production Thread - Part 1
Replies: 846
Views: 257841

Re: Boeing 737 MAX Production Thread - Part 1

Any news on SEA operators? Would love to see them in this part of the world!

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