Search found 688 matches

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by DH106
Sun Jan 09, 2022 10:51 pm
Forum: Technical/Operations
Topic: DC-10 tail mounted engine angle
Replies: 9
Views: 1813

Re: DC-10 tail mounted engine angle

High mounted engines will tend to make the aircraft go nose down, just as low slung engines want to make the nose rise.
I suspect the nose up/tail down angle of the DC-10's rear engine is to offset this tendency.

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by DH106
Mon Jan 03, 2022 5:34 pm
Forum: Civil Aviation
Topic: HS Trident
Replies: 108
Views: 14754

Re: HS Trident

Very interesting thread, thanks for bringing this up. As a classic-jet enthusiast, I must say that I really miss this type of threads on A.net during the last years. It appears that there is not so much interest for early jetliners anymore. Same, it's why I chose my a.net username way back when (th...

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by DH106
Thu Dec 30, 2021 12:15 am
Forum: Technical/Operations
Topic: Altimeters, static pressure, and lift
Replies: 48
Views: 2536

Re: Altimeters, static pressure, and lift

Cavitation is caused by a phase change, the rate of phase change depends upon local flow conditions (pressure, velocities, turbulence) as well as fluid properties (saturation pressure, densities, and surface tension). It is not a result of one factor. Cavitation is used all around us, like fuel inj...

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by DH106
Tue Dec 21, 2021 10:56 am
Forum: Technical/Operations
Topic: Boeing 727 Leading Edge Device Question
Replies: 9
Views: 1242

Re: Boeing 727 Leading Edge Device Question

The slat intermediate position usually has the slot between wing and slat sealed, making the slat effectively a 'leading edge droop' in this position. This is a compromise position that develops extra lift, but at much less drag than with the slot open (e.g. slat fully extended) - which is ideal for...

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by DH106
Wed Dec 15, 2021 7:43 pm
Forum: Technical/Operations
Topic: Holes or gaps in the upper surface of trailing edge flap segments?
Replies: 6
Views: 1388

Re: Holes or gaps in the upper surface of trailing edge flap segments?

Drag is a of major importance during cruise, but when the flaps are extended (and these 'holes' appear) it's of much less a concern, indeed it's very useful for better speed control down the approach.

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by DH106
Wed Dec 15, 2021 11:47 am
Forum: Technical/Operations
Topic: Which airliners have two jackscrew assemblies to control their horizontal stabilizer?
Replies: 7
Views: 1279

Re: Which airliners have two jackscrew assemblies to control their horizontal stabilizer?

How do these multiple jacks operate then if one hydraulic system goes down - with a jackscrew being irreversible? Unless they're placed in series (one after another) I guess, rather than in parallel (side by side) as you'd expect I can't see how they'd work. On the MD-11 the two nuts are connected ...

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by DH106
Tue Dec 14, 2021 5:55 pm
Forum: Technical/Operations
Topic: Which airliners have two jackscrew assemblies to control their horizontal stabilizer?
Replies: 7
Views: 1279

Re: Which airliners have two jackscrew assemblies to control their horizontal stabilizer?

How do these multiple jacks operate then if one hydraulic system goes down - with a jackscrew being irreversible?
Unless they're placed in series (one after another) I guess, rather than in parallel (side by side) as you'd expect I can't see how they'd work.

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by DH106
Fri Dec 10, 2021 2:07 pm
Forum: Technical/Operations
Topic: L1011 - High Angle of Attack on approach and landing
Replies: 15
Views: 3097

Re: L1011 - High Angle of Attack on approach and landing

You can't tell the angle of attack from just looking at footage or pictures. i would guess with very high resolution cameras these days sometimes you can if you (can) zoom in enough. best regards Thomas I think Starlionblue's point was that angle of attack is also a function of direction of travel ...

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by DH106
Tue Nov 30, 2021 9:00 am
Forum: Travel, Polls & Preferences
Topic: Surprise aircraft change?
Replies: 14
Views: 1460

Re: Surprise aircraft change?

There's a video on YouTube of a Concorde at Edinburgh substituting for the regular 757 London shuttle in 1994.
I bet the passengers didn't mind at all :)

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by DH106
Fri Nov 19, 2021 11:29 pm
Forum: Technical/Operations
Topic: The first ‘Electronic E6B’s’
Replies: 14
Views: 1808

Re: The first ‘Electronic E6B’s’

:roll: I should read the description ;-)

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by DH106
Fri Nov 19, 2021 12:00 pm
Forum: Technical/Operations
Topic: The first ‘Electronic E6B’s’
Replies: 14
Views: 1808

Re: The first ‘Electronic E6B’s’

One for $30 on eBay here: https://www.ebay.co.uk/itm/324836243473?_trkparms=ispr%3D1&hash=item4ba1bfb811:g:euQAAOSwdhNhbGvf&amdata=enc%3AAQAGAAACoPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSvhAqMt0wg86xg8aAkgjQJAkLkeZT%252B0P3PvSALXhxsN%252B%252BKTPXyVj9rS24%252FmnkJYQlmi1aw2kEYNh9VtDaVqy...

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by DH106
Fri Nov 05, 2021 10:26 am
Forum: Technical/Operations
Topic: What causes the pause on some aircraft between the time the nose is lifted off and the mains break free?
Replies: 11
Views: 1690

Re: What causes the pause on some aircraft between the time the nose is lifted off and the mains break free?

The DC-8 uses a plain flap design with hinges. Airbus and Boeing usually use Fowler and slotted flap designs. I don't think they're quite plain flaps - but similar to the 707 type fowler flap where the actual rearward extention is fairly low compared to modern types which have a large area-increase...

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by DH106
Wed Nov 03, 2021 2:54 pm
Forum: Travel, Polls & Preferences
Topic: Saab 340 / 2000 - Whose have you flown?
Replies: 18
Views: 1159

Re: Saab 340 / 2000 - Whose have you flown?

S340 - Aer Lingus back in the early 90's, LBA-DUB and back.

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by DH106
Fri Oct 29, 2021 6:14 pm
Forum: Aviation Hobby
Topic: turning a 747 100 into a 747 SP?
Replies: 3
Views: 1008

Re: turning a 747 100 into a 747 SP?

Flaps are different (only single slotted 4-bar type rather than the tripple slotted tracked type), tailplane & fin have greater span on the SP. There's also the 'wasp waist' fuselage just ahead of the fin to consider..

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by DH106
Thu Oct 21, 2021 10:36 am
Forum: Aviation Hobby
Topic: VIDEO: Absolutely AMAZING 150kg model Concorde takeoff!
Replies: 4
Views: 2323

Re: VIDEO: Absolutely AMAZING 150kg model Concorde takeoff!

Shame even the big model Concordes can't get the nose & visor correct & reasonably scale.
Awesome model though !

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-->

AirKevin wrote:
DH106 wrote:
Why is the VC-10 exempted?

Because someone started a separate thread for it.

viewtopic.php?f=4&t=1465669



Ahh - thanks :D

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by DH106
Wed Oct 20, 2021 7:39 pm
Forum: Travel, Polls & Preferences
Topic: Vickers VC-10 : Whose have you flown?
Replies: 5
Views: 647

Re: Vickers VC-10 : Whose have you flown?

As a baby, Kano - Barcelona, June 1966, Nigerian Airways (leased from BOAC, presumably G-ARVC).

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by DH106
Thu Oct 07, 2021 9:17 pm
Forum: Non-Aviation
Topic: Movie Adaptation of Books
Replies: 54
Views: 1867

Re: Movie Adaptation of Books

For recent books, The Martian movie did a good job of representing what was in the book and overall hued to it. One that completely missed it for me though was Ready Player One. The movie was more "inspired by" than accurate to the book. Tugg The Martian did an ok job - but it deviated fr...

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by DH106
Thu Oct 07, 2021 1:50 pm
Forum: Civil Aviation
Topic: UK. Refund probe into Ryanair and BA dropped
Replies: 33
Views: 2788

Re: UK. Refund probe into Ryanair and BA dropped

Yes, but it would be nice to HAVE THE CHOICE !

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by DH106
Fri Oct 01, 2021 10:32 am
Forum: Technical/Operations
Topic: How soon after takeoff can an airliner safely start a turn?
Replies: 24
Views: 2351

Re: How soon after takeoff can an airliner safely start a turn?

https://www.youtube.com/watch?v=xgOo6sqJQmA
-->

Concorde had to do an early left turn departing JFK on 31L didn't it? Canarsie something departure.
From about 0:50 in this vid
https://www.youtube.com/watch?v=xgOo6sqJQmA

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by DH106
Mon Sep 27, 2021 1:32 pm
Forum: Technical/Operations
Topic: A320 Idle Speed
Replies: 11
Views: 1492

Re: A320 Idle Speed

Crossbleed

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by DH106
Tue Aug 24, 2021 2:26 pm
Forum: Non-Aviation
Topic: Silly daft jokes.
Replies: 71
Views: 4078

Re: Silly daft jokes.

My favourite Tim Vine one-liner:
I met a farmer coming down the road and he said to me "I've 68 sheep,would you mind helping me round them up?".
"Sure", I said, "that's 70" :D :lol: :bouncy:

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by DH106
Sun Aug 22, 2021 4:58 pm
Forum: Technical/Operations
Topic: Does the DC-10 nose gear strut not meet the ground at a 90 degree angle?
Replies: 13
Views: 2288

Re: Does the DC-10 nose gear strut not meet the ground at a 90 degree angle?

Stranger still was the Lockheed Constellation, which as well as having a forward angled nose gear, had considerable 'camber' on the nose wheel axles - meaning that the wheels were angled so that the bottoms of the tires where closer together than the tops. Perhaps this was to counteract to some exte...

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by DH106
Wed Aug 18, 2021 5:39 am
Forum: Technical/Operations
Topic: Did the DC-8 and DC-10 have the largest passenger windows of all commercial jetliners?
Replies: 15
Views: 3540

Re: Did the DC-8 and DC-10 have the largest passenger windows of all commercial jetliners?

Agreed - definitely the Vickers Viscount takes the prize here.
Obviously pressurisation loads were less as the ceiling was lower, allowing these wonderfully large windows.

https://twitter.com/ASobester/status/1021802552772452352/photo/1

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by DH106
Tue Aug 17, 2021 11:26 am
Forum: Military Aviation & Space Flight
Topic: Russian Military Crashes Discussion Thread - Part 2
Replies: 92
Views: 14330

Re: Ilyushin 112 prototype crash

You can see the plane yawing to the left as the pilot tries to keep hold of it, but then the right wing drops, either by stalling or dropping below Vmc.

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by DH106
Thu Aug 12, 2021 5:57 am
Forum: Technical/Operations
Topic: Carbon Composite Fuselage Issues
Replies: 18
Views: 2603

Re: Carbon Composite Fuselage Issues

I think he was suggesting that Airbus deployment of composites does not always ensure weight savings in a given structure. I would guarantee you the overall sun assembly will be lighter, ie the HTP. You cannot compare parts within a sub assembly as that assumes the load paths are the same. It is al...

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by DH106
Tue Aug 10, 2021 1:33 pm
Forum: Civil Aviation
Topic: Plane crash in the city of Victoria, MN
Replies: 24
Views: 6483

Re: Plane crash in the city of Victoria, MN

Looks to me as if both wings have failed at the root.
I'm assuming here that there's a red area on the left wing's underside going out a few feet from the root. The rest of the wing underside is white.
Just my take.

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by DH106
Sun Jul 11, 2021 9:18 am
Forum: Technical/Operations
Topic: Bump on Boeing 737-200 engine
Replies: 9
Views: 1751

Re: Bump on Boeing 737-200 engine

Almost certainly covering part of the flap carriage which probably protrudes slightly at some flap angle.

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by DH106
Fri Jun 11, 2021 1:10 pm
Forum: Civil Aviation
Topic: The Giant aircraft That Failed
Replies: 60
Views: 21293

Re: The Giants That Failed

Boeing757100 wrote:
I think that another big flop was the Bristol Brabazon.


That was British though, not American.
The OP was dealing initially with American.

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by DH106
Wed Jun 09, 2021 2:29 pm
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 15222

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

'Getting more performance out of the wing' has to be the least valid point I've heard when comparing the different flight control philosophies. Starting with the dubious claim that you'll be closer to max lift when at the limit of stick shaker than you would be with max aft stick. That may or may n...

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by DH106
Wed Jun 09, 2021 8:11 am
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 15222

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

The stall begins at CLmax by definition, but I take your point about it being progressive.
For that reason, presumably in a Boeing if you fly the max energy line and there are no margins, you'd be in stick shaker?

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by DH106
Tue Jun 08, 2021 7:05 pm
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 15222

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

If it was at CLmax, there would be a stick shaker. There is none. Well the Boeing 'line' can't be at CLmax either for the same reason. Common sense and safety would dictate that Boeing would also apply a margin below the absolute CLmax - otherwise the slightest overshoot by the pilot would stall th...

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by DH106
Tue Jun 08, 2021 11:24 am
Forum: Civil Aviation
Topic: AA B38M Birdstrike at SVD
Replies: 33
Views: 7320

Re: AA B38M Birdstrike at SVD

Prior to the rejection, the aircraft looked very 'nose-up' with the nosewheel barely on the ground. Is this usual? I've never seen a 737 with that attitude on take-off.

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by DH106
Tue Jun 08, 2021 10:39 am
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 15222

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

2) On an Airbus, you pull the sidestick all the way back. I agree. However, you are not Max Performing the wing. You are coming close but you're not there. On the Boeings, you are right at the stick shaker. It is not difficult to pull right to the max energy line on the PFD. If you can fly an ILS o...

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by DH106
Mon Jun 07, 2021 2:45 pm
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 15222

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

VMCA787 wrote:
... but it was obvious the design philosophy was to take options away from the pilot.


Interesting, what options does it take away from a pilot? To stall? To fly inverted? To botch a CFIT escape perhaps?

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by DH106
Tue Apr 13, 2021 4:33 pm
Forum: Civil Aviation
Topic: NTSB Renews Calls for Cockpit Video Recorders
Replies: 344
Views: 24578

Re: NTSB Renews Calls for Cockpit Video Recorders

Well, if you look at how many CVR audios are now in the public domain, the concerns are understandable.
It'd be a goon's wet dream to have cockpit crash vid. Some sick people around.

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by DH106
Thu Mar 11, 2021 8:14 pm
Forum: Technical/Operations
Topic: Holding the nose wheel off
Replies: 35
Views: 4539

Re: Holding the nose wheel off

CosmicCruiser wrote:
Holding the nose wheel off certainly won't adhere your landing distance data.


Adhere it to what?!

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by DH106
Tue Mar 09, 2021 10:41 pm
Forum: Travel, Polls & Preferences
Topic: Why no Boeing 707 stretch?
Replies: 21
Views: 4858

Re: Why no Boeing 707 stretch?

I think the 720 was the same length as the original -100?
There was the -138 shrink case specially for Qantas

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by DH106
Fri Mar 05, 2021 12:16 pm
Forum: Technical/Operations
Topic: Holding the nose wheel off
Replies: 35
Views: 4539

Re: Holding the nose wheel off

If you hold the nosewheel off you risk slowing to a speed where the tail stalls. That will lead to the nose gear coming down rather too rapidly. I'm not sure the tailplane/elevators will actually get anywhere near their stalling AOA - the aircraft-on-the-ground geometry in most cases wouldn't allow...

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by DH106
Sun Feb 07, 2021 11:39 pm
Forum: Civil Aviation
Topic: A Cat's Tale: A cat got locked in El Al's 739, probably since the plane's last flight on January 24th 2021.
Replies: 47
Views: 10540

Re: A Cat's Tale: A cat got locked in El Al's 739, probably since the plane's last flight on January 24th 2021.

ntehrani wrote:
There's a picture in the SimpleFlying of kitty safe in the cockpit window. :)


A purrrrr-fect ending to the story :)

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by DH106
Mon Feb 01, 2021 10:03 am
Forum: Technical/Operations
Topic: Air scoops on B-36 prop blades
Replies: 3
Views: 1761

Re: Air scoops on B-36 prop blades

Think they're exit vents for the prop heating air?

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by DH106
Thu Jan 21, 2021 10:38 am
Forum: Civil Aviation
Topic: Sriwijaya Air 737-500 (SJ182 CGK-PNK) crashes shortly after takeoff
Replies: 868
Views: 261765

Re: Sriwijaya Air 737-500 (SJ182 CGK-PNK) crashes shortly after takeoff

A tail should never have broken off because of rudder use unless of mechanical failure unrelated to pilot control or because of loss of control. The limiters should have been designed to handle eliminate that possibipity. Was he a knucklehead for being overly aggressive sure but that's where it sho...

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by DH106
Sat Dec 12, 2020 10:41 pm
Forum: Technical/Operations
Topic: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?
Replies: 28
Views: 4556

Re: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?

That prompts the question: why did they design it that way? I imagine having the structure further inboard may have saved some weight. If it's measurably better, why did other types not converge to this design? Why put the legs further out if it adds weight? In the case of Concorde, the necessary l...

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by DH106
Sat Dec 12, 2020 1:15 pm
Forum: Technical/Operations
Topic: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?
Replies: 28
Views: 4556

Re: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?

I think the 330/340 oleo is designed to depressurize so they can squeeze it in the bay. I'm not sure exactly how it works or why it was designed that way though.... They designed it that way to make it fit. ;) The oleo is not depressurised. There's a mechanical thingamabob called the "shorteni...

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by DH106
Mon Dec 07, 2020 2:06 pm
Forum: Technical/Operations
Topic: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?
Replies: 28
Views: 4556

Re: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?

If you wanna see some REALLY confused landing gear, check out A340. Side ones tilted back, middle one tilted forward. That's only on the A340 500/600 - prior versions only had a twin wheel centre gear. I suspect the reason for the forward tilting middle bogie is - as it's forward retracting - to al...

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