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by DH106
Mon May 16, 2022 5:49 am
Forum: Technical/Operations
Topic: Why does a 737-700 use flap 1 and not zero flap for take off?
Replies: 23
Views: 2365

Re: Why does a 737-700 use flap 1 and not zero flap for take off?

Since Flap 1 extends the LE devices I'd say that there'd be considerably more than just 'a small amount of extra lift generated'. The leading edge devices don't so much increase lift as increase the AoA margin, though of course as you "use" the higher AoA, you do get more lift. Either way...

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by DH106
Sun May 15, 2022 4:00 pm
Forum: Technical/Operations
Topic: Why does a 737-700 use flap 1 and not zero flap for take off?
Replies: 23
Views: 2365

Re: Why does a 737-700 use flap 1 and not zero flap for take off?

Since Flap 1 extends the LE devices I'd say that there'd be considerably more than just 'a small amount of extra lift generated'.

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by DH106
Thu May 05, 2022 2:33 pm
Forum: Civil Aviation
Topic: Help wanted with mystery biplane.......
Replies: 14
Views: 2600

Re: Help wanted with mystery biplane.......

Don't think it's any of the above - note how the forward cockpit screen on the mystery biplane is more or less level with the leading edge of the upper wing. The front cockpit seems to be much further back on the above suggestions. The Blanik glider stored above the mystery biplane - EC-CGC seems to...

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by DH106
Wed May 04, 2022 2:17 pm
Forum: Travel, Polls & Preferences
Topic: Passengers Only: Best Cockpit Visit Or Aircraft Tour Story!
Replies: 14
Views: 983

Re: Passengers Only: Best Cockpit Visit Or Aircraft Tour Story!

In 1993 my girlfriend & I were flying Manchester (UK) to Paphos (Cyprus) on a Caledonian 757. My girlfriend was a stewardess for another airline and knew I was an enthusiast and got talking with the stewardesses on this flight To my very pleasant supprise this ended up with me being invited to f...

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by DH106
Mon Apr 25, 2022 6:04 am
Forum: Technical/Operations
Topic: Horizontal Stabiliser Angle of the Bristol 188
Replies: 8
Views: 1406

Re: Horizontal Stabiliser Angle of the Bristol 188

I think the OP might be referring to the significant anhedral, not the pitch angle of the stabiliser. At a guess, that would be to keep it out of the engine exhaust. Just for clarity - the tailplane is mounted high on top of the fin as a 'T' tail and has no (discernible) anhedral. Is it possible yo...

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by DH106
Wed Apr 20, 2022 3:36 pm
Forum: Civil Aviation
Topic: TAP A320 landing incident at CPH on 8 April
Replies: 7
Views: 5027

Re: TAP A320 landing incident at CPH on 8 April

https://aviation-safety.net/database/re ... 19780211-0
-->

Could possibly be more related to this kind of incident where a deployed reverser doesn't re-stow after a go-around is initiated ?

https://aviation-safety.net/database/re ... 19780211-0

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by DH106
Sun Apr 17, 2022 6:40 pm
Forum: Technical/Operations
Topic: Throttle levers on 4+ engined aircraft
Replies: 26
Views: 3552

Re: Throttle levers on 4+ engined aircraft

I wouldn't have thought 4 throttles would be a problem, their curved indentation shape natually fitting to 4 fingers of a hand, but I've often wondered about 6 engined (An225?) or even 8 engined (B52?) aircraft. Are their throttles easy to manipulate togther?

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by DH106
Fri Feb 25, 2022 10:58 am
Forum: Civil Aviation
Topic: Qantas to firm up A350-1000’s for Project Sunrise by mid year
Replies: 84
Views: 22727

Re: Qantas to firm up A350-1000’s for Project Sunrise by mid year

NTLDaz wrote:
Qantas hasn't said it though. I mean the A350 - 1000 will be capable of flying from Newcastle to London nonstop ut it doesn't mean it will happen.



But that's only 300 miles ! :D :D :shock: :duck:

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by DH106
Thu Feb 24, 2022 3:31 pm
Forum: Civil Aviation
Topic: Antonov Design Bureau News and Discussion Thread
Replies: 144
Views: 32557

Re: Antonov Design Bureau Operations

Apparently there's some speculation on the Facebook threads that the An-225 destroyed in the hanger fire might have been the half assembled 2nd aircraft that was apparently stored there.
I do hope this is true and that first, airworthy example survives.

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by DH106
Tue Feb 22, 2022 2:29 pm
Forum: Non-Aviation
Topic: Celebrity Crush
Replies: 39
Views: 3512

Re: Celebrity Crush

Again probably showing age, but.......

Rachel Ticotin - Total Recal (original), Falling Down....

:blush: :blush:

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by DH106
Mon Feb 21, 2022 4:01 pm
Forum: Military Aviation & Space Flight
Topic: NASA plans to de-orbit ISS in 2031
Replies: 60
Views: 5441

Re: NASA plans to de-orbit ISS in 2031

Presumably NASA has run this plan past the other international partners/owners of the ISS, with it being the INTERNATIONAL Space Station and all ?

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by DH106
Sun Feb 06, 2022 3:13 pm
Forum: Technical/Operations
Topic: Which airliners have ram air turbines. Which power hydraulics and which provide electricity?
Replies: 46
Views: 5010

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

Tristarsteve wrote:
The Vickers VC10 had two RATs, One electric and one hydraulic!


Only the prototype G-ARTA had both. Production VC-10's only had the electric RAT.

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by DH106
Fri Jan 21, 2022 9:55 am
Forum: Technical/Operations
Topic: Curved runway starter extensions
Replies: 15
Views: 3076

Re: Curved runway starter extensions

I think Brooklands airfield in the UK had an offset starter extension. In the 1960's, Vickers manufactured the VC-10 there, and since the runway was < 4000 feet, each new VC-10 was required to use the starter extension to depart to the nearby Wisley airfield (which had a longer runway) for final fit...

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by DH106
Fri Jan 21, 2022 9:43 am
Forum: Technical/Operations
Topic: Boeing 727 Leading Edge Device Question
Replies: 13
Views: 2747

Re: Boeing 727 Leading Edge Device Question

extender wrote:
The idea behind the Kruger Flap/Slat arrangement,was, in the event of a stall, that the inner part of the wing stall before the outboard part of the wing, thereby keeping roll control.


And also with the wing being swept, preventing a possible undesireable nose-up pitch should the tips stall first.

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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: 2698

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: 117
Views: 17166

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: 2894

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: 13
Views: 2747

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: 1578

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: 1494

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: 1494

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: 3578

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: 1816

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: 2236

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: 2236

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: 1810

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: 1328

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: 2587

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: 3921

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: 713

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: 2344

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: 2928

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: 2522

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: 1597

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: 4265

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: 2464

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: 3694

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: 14680

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: 2711

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: 6617

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: 1796

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: 21876

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: 15604

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: 15604

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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