swindonseagull
Well-known member
Planes are designed to glide to safety in most circumstances* but there is always/often a critical height on take off where it is not possible. *I still find this hard to believe but we were told this at a Coroner's Inquest (I was on the jury). Apparently this also applies to helicopters.
There are other things that apply as well. On take off and presumably at air shows some technical person will be watching for imminent faults. Risk assessment should apply at air shows. Organisers should predict the worst. Shoreham is very strong on exhibitions and everybody has to do them. The worst fear of organisers.
For a plane to 'glide' it needs altitude and forward speed, Helicopters autorotate which also requires altitude and forward speed.
Autorotation ( in simple terms) is where the gearbox which drives the rotor head disconnects from the engive via a clutch system allowing the rotor to spin, The rotor blades are of course providing the lift for the aircraft. This will only allow the helicopter to land it will not allow it to fly to the nearest airport.
Large aircraft have been know to run out of fuel and glide many miles, ( http://www.nytimes.com/2001/09/10/world/jet-pilot-who-saved-304-finds-heroism-tainted.html ) the hydraulics for controls being pressureised by freespining engines ( the pumps are directly on the gearbox) also they have a RAT ( Ram air turbine ) which is deployed from the belly and uses a propellor and the forward speed to run a pump to operate vital hydraulics.....anyway I digress.
As for technicians looking out for intermittent failures on take off that does not happen, However there will be an airshow commitee existing f very experienced aircrew who can give a pilot a red card and that pilot is to land or depart the airfield immediatly, A red card can be given for any dangerous manouvre or a monouvre that is not in the pre agreed display plan.
I have been an Aircraft engineer for 35 years and have resisted posting on this thread, I feel so bad for the losses of people who had nothing to do with the airshow, The CAA rightly so have said vintage aircraft can now only fly gentle manouvres and not aerobatics, The Vulcan has been cleared to fly its normal display as its not deemed aerobatic.
The Red Arrows and other military aircraft are legislated my the MAA (Military Aviation Authority) so those display teams will still be able to carry out aerobatics ( at the moment)
Now the AAIB ( air accident investigation branch) have a massive job to find out what happened.
There are 2 threads on Pprune which are worth a read but way to technical...
RIP to all who lost thier lives that day.
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