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Plane Spotters Corner
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Old 10-11-2011, 21:41   #556
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Re: Plane Spotters Corner

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Originally Posted by DocDutch View Post
Its a shame 2 brave pilots of the red arrows lost in what less than 6 months. Failure of the parachute is in my opinion a criminal investigation as you could class it as murder
I think that failure of the parachutes is just a symptom of the main cause..

The seats fired unintentionally which means that the firing mechanism might have been the only item to activate, the drogue and main chute might not have activated if the current theory amongst the RAF techs is correct in that the seat control unit itself failed
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Old 15-11-2011, 17:30   #557
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Re: Plane Spotters Corner

This is a pretty good site to have a look around, choose which hangar to have a look in and have a virtual tour around the museum. Albeit the us airforce, its still very good.
http://www.nmusafvirtualtour.com/full/tour-pkg.html
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Old 15-11-2011, 17:54   #558
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Re: Plane Spotters Corner

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Try getting your facts right for once.
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Old 15-11-2011, 17:56   #559
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Re: Plane Spotters Corner

Did anyone else watch How to build: A super Jumbo Wing on BBC2 on Sunday?

I've never worked on anything that big and was surprised at how tight a tolerance they work to involving such a large part with that amount of flex.. An amazing program for those interested or involved in aviation or even just engineering.. Last two programs are from McLaren and EADS (next Sunday and the Sunday after)
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Old 15-11-2011, 21:39   #560
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Re: Plane Spotters Corner

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Originally Posted by Kymmy View Post
Did anyone else watch How to build: A super Jumbo Wing on BBC2 on Sunday?

I've never worked on anything that big and was surprised at how tight a tolerance they work to involving such a large part with that amount of flex.. An amazing program for those interested or involved in aviation or even just engineering.. Last two programs are from McLaren and EADS (next Sunday and the Sunday after)
I saw that as well, and I've seen the tech manuals and in some case the tolerances are several thousandsth of an inch.

Airbus (who build the A380) is a part of EADS
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Old 15-11-2011, 23:27   #561
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Question Re: Plane Spotters Corner

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Originally Posted by Kymmy View Post
I think that failure of the parachutes is just a symptom of the main cause..

The seats fired unintentionally which means that the firing mechanism might have been the only item to activate, the drogue and main chute might not have activated if the current theory amongst the RAF techs is correct in that the seat control unit itself failed
Would I be corrrect in assuming the drogue and main chute are designed to trigger at an altitude lower than the aircraft's at time of deployment to avoid the possibility of becoming entangled in the fuselage during descent? if so then that would explain it as when you're at a height of 0AGL then there isn't much room for a negative. It would also explain the minimum safe deployment height AGL to allow for full canopy opening.
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Old 16-11-2011, 08:24   #562
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Re: Plane Spotters Corner

Quote:
Originally Posted by Hom3r View Post
I saw that as well, and I've seen the tech manuals and in some case the tolerances are several thousandsth of an inch.

Airbus (who build the A380) is a part of EADS
Sorry I meant ESA, the third program is about a satellite.

---------- Post added at 09:24 ---------- Previous post was at 09:16 ----------

Quote:
Originally Posted by Lord Nikon View Post
Would I be corrrect in assuming the drogue and main chute are designed to trigger at an altitude lower than the aircraft's at time of deployment to avoid the possibility of becoming entangled in the fuselage during descent? if so then that would explain it as when you're at a height of 0AGL then there isn't much room for a negative. It would also explain the minimum safe deployment height AGL to allow for full canopy opening.
The drogue should deploy at roughly the apogee of the seats flight... The drogue then pulls the parachute and the pilot free from the seat before descent (the seat has lateral speed as well at this point which is enough to act on the drogue). The seats trajectory is set to allow enough separation of the seat to aircraft so not to allow the pilot to land on top of the plane even at zero speed.

Full timeline for the Mk10 is as follows

Quote:
- Seat firing handle pulled causing seat initiation cartridge to fire
- Harness retraction unit operated, command firing initiated
- Primary cartridge fired causing inner and intermediate pistons to rise, releasing top latch
- Seat rises up guide rails
- Miniature detonating cord trip initiates canopy fracturing system
- Secondary cartridges fire in turn as seat rises
- Electrical connections separate disconnecting seat actuator circuit, IFF
switch and oxygen regulator supply lead
- Aircraft portion of main oxygen generating system block separate
disconnecting main and back-up oxygen
- Personal equipment connector aircraft portion disconnects from seat portion
- Anti-g suit hose disconnects
- Leg restraint lines draw back and restrain aircrew’s legs
- Leg restraint lines become taut and rivets shear, freeing lines from floor brackets
- Trip rods withdraw sears from drogue gun and barostatic time-release units
- Emergency oxygen trips
- Remote rocket initiator operated by static line, cartridge fires to ignite rocket pack

- Rocket pack sustains upward thrust of ejection gun, diverging trajectories for front and rear seats
- After delay mechanism has operated, drogue gun piston fires
- Ejected piston withdraws closure pin from closure flaps of drogue parachute pack and deploys drogues.
- Deployment of drogues stabilize and retard the seat and aircrew

- Low altitude/High speed -
- Seat descends stabilised by drogues
- Barostatic time-release unit completes run and fire

- High speed/high altitude -
- Barostatic capsule operates to prevent parachute deployment above pre-determined altitude
- Barostatic controlled g-switch delays parachute deployment above 7000 ft until speed and g-force are reduced
- Barostatic time release unit operates below pre-determined altitude, completes run and fires

- Manual separation (override) used if automatic system fails
- Gas from cartridge used to
- Free drogue shackle link
- Release parachute mechanical lock
- Operate upper harness locks and lower harness release mechanism to free lower harness lugs, negative-g straps, leg restraint lines and personal equipment connector man portion
- Drogues withdraw parachute from container
- Sticker straps momentarily hold aircrew in seat
- Parachute develops, lifts aircrew and survival pack from seat and pulls sticker clips from clips causing aircrew and seat to diverge
- Normal parachute descent follows
- Aircrew releases either of two quick-release connectors to lower survival pack to end of line
- Survival pack opened manually when necessary
Again from the unofficial sources the control box that sequences the above events might have failed causing the unintentional firing of the rockets and nothing else.
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Old 16-11-2011, 17:17   #563
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Re: Plane Spotters Corner

Unusual takeoff technique


http://www.liveleak.com/view?i=9f4_1321461076
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Old 16-11-2011, 18:23   #564
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Re: Plane Spotters Corner

Wind or jetwash?
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Old 23-11-2011, 06:30   #565
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Re: Plane Spotters Corner

Very, very, very lucky.....

http://www.bbc.co.uk/news/world-asia-pacific-15848886
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Old 23-11-2011, 09:21   #566
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Re: Plane Spotters Corner

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very brown trouser time
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Old 23-11-2011, 10:21   #567
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Helicopter Crash Caught Live On Internet

One very lucky man....
http://news.sky.com/home/world-news/article/16115780

Horrified internet viewers in New Zealand have seen live pictures of a helicopter becoming entangled in cables and crashing to the ground.

The chopper was helping install a giant Christmas tree on Auckland's waterfront when its blades appeared to catch cables attached to scaffolding causing it to break up about 25ft above ground.
The dramatic footage was filmed by TV New Zealand and was being broadcast live on their website.
The B2 Squirrel helicopter's tail is seen breaking up, causing the rest of the aircraft to spin round and crash.

The pilot was seen being thrown around the cabin but incredibly he survived and walked away from the scene with the help of two workmen involved in the project.
He is now receiving medical attention in hospital but is believed to have avoided serious injury.
The TV station named him as Greg Gribble, saying he has 20 years flying experience.
Speaking to TVNZ his son Jazz Gribble said he spoke to his father shortly after the crash and he was "shaken but doing reasonably well".
The Civil Aviation Authority is now investigating the accident.
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Old 23-11-2011, 10:26   #568
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Re: Helicopter Crash Caught Live On Internet

Quote:
Originally Posted by Kingofthedead4 View Post
One very lucky man....
http://news.sky.com/home/world-news/article/16115780

Horrified internet viewers in New Zealand have seen live pictures of a helicopter becoming entangled in cables and crashing to the ground.

The chopper was helping install a giant Christmas tree on Auckland's waterfront when its blades appeared to catch cables attached to scaffolding causing it to break up about 25ft above ground.
The dramatic footage was filmed by TV New Zealand and was being broadcast live on their website.
The B2 Squirrel helicopter's tail is seen breaking up, causing the rest of the aircraft to spin round and crash.

The pilot was seen being thrown around the cabin but incredibly he survived and walked away from the scene with the help of two workmen involved in the project.
He is now receiving medical attention in hospital but is believed to have avoided serious injury.
The TV station named him as Greg Gribble, saying he has 20 years flying experience.
Speaking to TVNZ his son Jazz Gribble said he spoke to his father shortly after the crash and he was "shaken but doing reasonably well".
The Civil Aviation Authority is now investigating the accident.
Yes l saw this on Breakfast news this morning and its a absolute miracle that there were no serious injuries or fatalaties but l am amazed that the helicopter was so close to the cables in the first place.
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Old 24-11-2011, 09:35   #569
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Re: Plane Spotters Corner

I've posted a few times about the low flying of aircraft over/near the village whether it be military or civilian (especially stuff from Duxford) well for once I managed to grab a pic to show how low (and this one isn't the lowest!!)

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Old 24-11-2011, 09:59   #570
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Re: Plane Spotters Corner

Although no expert on these things you think sometimes a accident is waiting to happen with them flying so low and in populated areas as well.
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