Aircraft General Discussion

[JAParticipant @ja]

Posted by Geoff Theasby on 31/10/2015 08:47:11:

I have a question. I know of the Doppler Effect, where the pitch of an approaching train horn or whistle rises, then falls as it passes and recedes. I have, however noticed that the whine of a jet aircraft, whether the Vulcan or the local police helicopter, appears to rise in pitch as it recedes. Any idea why this is?

Geoff

Unlike a horn or whistle a jet engine is a complex device with each major component producing noise with a range of frequencies and amplitudes. In addition the "radiation" of these noises is not uniform around the engine. I would say that the rise in pitch as the engine recedes from the listener comes from the turbine.

The old Hawker Hunter had a distinctive drumming noise from the compressor. It was very obvious when the aircraft was flying straight at one.

JA

[Neil WyattModerator @neilwyatt]

I'm not someone who get particularly excited about airliners (at least modern ones) but I was up on Barr Beacon this morning and it was obviously smack under the final approach for Birmingham Airport in the lovely bright, still but hazy conditions. A great opportunity to flex the zoom and image stabilisation capabilities of my camera:

[martin perman 1Participant @martinperman1]

Having watched the Victor at Bruntingthorpe many times I cant see how it could "just lift off" as it leapt quite a distance off the ground, makes me wonder if they gave the stick a tug to much.

Martin P

[Ian S CParticipant @iansc]

Martin, I did mention Howard Hughs and the Spruce Goose. I imagine it has happened with other aircraft.

Ian S C

[Clive HartlandParticipant @clivehartland94829]

I always understood that there were 2 points about taking off, V1 where they could abort the take off and V2 where the speed then committed them to lift the plane as an abort was then a crash? The Victor was unladen and therefore light and the flight characteristics totally different,. Taxiing at a low speed just enough to show the public a moving aircraft. Luckily the Victor came to a stop before it hit the end of the runway and even then I think it went onto the grass.

Clive

[Nick_GParticipant @nick_g]

.

Not a short video but worth watching. So make yourself a cuppa first.

Nick

[Paul BarrettParticipant @paulbarrett57424]

Posted by Clive Hartland on 01/11/2015 10:34:03:

I always understood that there were 2 points about taking off, V1 where they could abort the take off and V2 where the speed then committed them to lift the plane as an abort was then a crash? The Victor was unladen and therefore light and the flight characteristics totally different,. Taxiing at a low speed just enough to show the public a moving aircraft. Luckily the Victor came to a stop before it hit the end of the runway and even then I think it went onto the grass.

Clive

V1 is the rejected take off max speed. It varies depending on weight, runway length and conditions etc but is a ground only speed. All other speeds are aerodynamic. Once over V1 you are committed to fly. Vr is the rotate speed and V2 is the minimum speed for climb on one engine (or 2 engines if you want to go up like a bat out of hell) (Best angle of climb) for obstacle clearance. Once reaching Aa (acceleration altitude) usually 1000 feet above aerodrome altitude you accelerate to Vfs (which on 2 engines you will probably be above) which is flap retraction speed.

Airliners are normally trimmed before take off for a V2 climb ready in case of a engine failure and re trimmed after take off when safely in the climb.

[Clive HartlandParticipant @clivehartland94829]

Thanks for explaining that Paul, I have only ever heard of the V1 and Vr/V2. I understand there is a standard procedure for takeoff .

Clive

[Speedy Builder5Participant @speedybuilder5]

As an apprentice in 1963 – 1968, I helped to build fuselage jigs and later helped fit the the Auxillary Air intake doors for the TSR2. Until a few years ago, I used sample cockpit glass as small surface plates. These were glass / silicone sandwiches about 1" thick.
BobH

[David Clark 13Participant @davidclark13]

I seem to remember a model of the TSR2. I think it was on a cornflake packet or similar. Lasted longer than the real one!

[Neil WyattModerator @neilwyatt]

LOL! All that wonderful hi-tech testing, then they are shaping the body panel on an English wheel!

Neil

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Neil Wyatt on 10/11/2015 09:49:20:

LOL! All that wonderful hi-tech testing, then they are shaping the body panel on an English wheel!

.

Neil,

When I left Avro in 1998, they were still shaping some panels on the English Wheel.

MichaelG.

[clogsParticipant @clogs]

Watched theTSR2 video,

all politician's are clowns , it's just…….

who will save us ??????????

Clogs

<edit> No sex, politics or religion!

Edited By Neil Wyatt on 10/11/2015 20:21:26

[martin perman 1Participant @martinperman1]

Gentlemen,

Watch this short video.

Martin P

[Ian AbbottParticipant @ianabbott31222]

Just watched the Canadian Warplane Heritage Museum video of the ten Merlin formation (Lanc, Mozzie, two Spits and two Hurries)… I hate this word, but awesome…… I never could put a link on here, but it's easy enough to find on YouTube. Four beautiful aircraft types. You'd never call the Lancaster pretty, but everything about it is perfectly in proportion, it projects purpose and power. Wonder if the NZ guys have thought of putting a couple of replicas together….

As well, the Vintage Wings of Canada web site is worth keeping an eye on, a piece is added every week or so. Some interesting stories and photos.

Ian

[Ian S CParticipant @iansc]

The transport museum (MOTAT) in Auckland has an ex French Lancaster, it flew into Auckland a good many years ago, but I don't think they could possibly afford to maintain it in an airworthy condition, our local DC-3 Trust can't even afford to keep ZK- AMY in the air, it requires a major inspection, and some work done, and in it's last few hours of service had some major troubles with one engine, cracked cylinders. It also is being looked after at a museum at Ashburton in mid Canterbury.

The Lancaster was designed to do a job, and it did it well. The British heavy bombers were restricted by the demand that the wingspan had to fit in the hangers of the time, the same aircraft with a higher aspect ratio wing, ie., longer, would have been more efficient at altitude, but with all the restrictions there was nothing else that could carry the load.

Ian S C

Edited By Ian S C on 16/11/2015 12:09:29

[Danny M2ZParticipant @dannym2z]

Just walked out of the front door when this appeared over the lake. Managed to grab the camera.

It's predicted to reach over 100°F here tomorrow so I think that it was practicing scooping-up water for bush-fire fighting.

* Danny M *

[Sam StonesParticipant @samstones42903]

Hi Danny,

Hope your are not near those WA fires.

Sam

Melbourne

[Danny M2ZParticipant @dannym2z]

G'day Sam, I live next to Lake Hume (NSW-Vic border) Thanks for caring.

Total Fire Ban here tomorrow.

I might just be able to get some pics of the big Sikorsky wokka-wokka's that sometimes suck water from the lake.

Also, there is a Focke Wulf 190 replica flying from Albury that I hope to grab some photo's of in the near future; it sometimes flies over the lake as the airport is only a few km away.

* Danny M *

[V8EngParticipant @v8eng]

Coming up on Sunday 29th November at 19.30 on channel 4, Guy Martin hosts a programme dealing with the Vulcan and the preparations for its final flight.

The programme is 1 and a 1/2 hours long.

Edited By V8Eng on 27/11/2015 19:18:09

[Ian S CParticipant @iansc]

From another site that I frequent, the Wings Over New Zealand /RNZAF Proboards. On the 2/1/16, a lad here in NZ celebrated his 16th birthday by flying solo 16 different aircraft types, 4 GA types including Tigermoth, Cessna 150, Victa 150 Airtourer, and an Auster Airdale, the other 12 were micro lights. Might be some sort of record.

Ian S C

[martin perman 1Participant @martinperman1]

Gentlemen,

Just before Christmas I had to clear my loft out ready for it to be insulated throughout with 300 mm fibre wool, I came across several boxes of slides I had forgotten I had, this afternoon I set up a slide reader, bought off Amazon this week, connected to my laptop and have come across some classics from 1976 including USAF Phantoms, Canadian Airforce and Norwegian Airforce F104 Starfighters, USAF F111's, Wessex Helicopters load carrying and BAC Lightnings. When I've been through the various boxes I will put some up for viewing.

Martin P

[Ian S CParticipant @iansc]

That should be interesting Martin, those slide readers are great, my one works on negatives also.

Ian S C

[martin perman 1Participant @martinperman1]

Ian,

mine does as well but I didn't know until it arrived I will put some photo's up tonight.

Martin P

[Speedy Builder5Participant @speedybuilder5]

Obituary.
The first test pilot of the French built Concord(e) died last Monday at the age of 95 outliving (by time and not age) Brian Trubshaw, Uk's test pilot by another 15 years.

**LINK**

BobH

[Author]

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