Air Speeds

[BabyBear]

Can someone enlighten me?

In a recent discussion with a friend he made comment that it is the breaking of the sound barrier by military aircraft that is responsible for setting off alarms at airshows.
Naturally I disputed this, however I was unable to even guess at typical flypast speeds.

What typically do you guys achieve during low level flypasts?

Cheers

[stillin1]

It is the resonance (noise)from the jet engines that sets off the car alarms, ususlly when in reheat. If you drop a boom (sonic boom) the alarm will be the mild panic as you wait to get sent home. Supersonic at airshows is a huge no-no:ok:
540 ish knots is pretty normal, 600 ish if you are somewhere where you can get away with it (I never said that);)

[johno617tonka]

must admit i've never been to an airshow where an a/c has broken the sound barrier!
but.... the alarms could be set off by the same sort of pressure waves that you feel when an a/c is really 'letting rip' as it takes off/ applies power etc etc
lets face it, if the cars are anything like the ones on my street, the local 'moggy' sets them off when he 'lets rip'!!!!

[Pontius Navigator]

You don't need afterburner to set off the car alarms although Concorde was responsible for flattening more than a few car batteries.

It is possibly less likely with modern, quiet, airliners but not unheard of for them to set off car alarms today even.

[LFFC]

.........of course, there was the famous 4-ship Lightning flypast at Valley about 25 years ago!

[Background Noise]

Max speed at airshows is M0.9 or 600 kts.

[Olly O'Leg]

Car alarms still go off at work with a GR4 taking off in full blower. Standing outside of the runway control caravan during night take-offs is not just noisy - it's an experience!!! :D

[BabyBear]

Thanks for the info guys.

Have a good one!

[BEagle]

You mean the 4 Gutersloh Lightning F2As - one of which dropped a boom on Caergollywog?

Tojo (the Stn Cdr) went nuts!

My all time favourite car alarm experience was the Yak 141 Freestyle at Farnborough one year - the beeping and cheeping went on for several minutes after he'd finished his hovering stuff!

I remember that a 'Sabre of Fighter Command breaking the sound barrier' event at RAF Merryfield's At Home day in 1953 or 1954 was actually a bit of a non-event. But the odd boom dropped by 892's F-4s a few years later was pretty impressive!

[DucatiST4]

I can set off car alarms with my motorbike (its a Ducati as you may have guessed) so i'm sure a fast jet will have no trouble.

[Blacksheep]

I remember Lightnings doing 'double bangers' at Middleton St George BoB Open days when I were a lad. It might not have been s a supersonic boom, but it seemed like one to me. Really hurt your lugs it did. They'd come in silently from the Teesside end then there'd be an enormous double bang - Ba-Bam! - as they went past followed by that magnificent kidney shaking racket. It was the Lightnings that persuaded me to join the RAF.

Then I never got to go near one ever again... :confused:

[Krystal n chips]

A few years ago now--mid 90's--Concorde departed on MAN 06 ( the original ) for Toronto one very cold and clear November evening----turned left still with the burners on ( a beautiful sight )--and er, duly set off most of the house and car alarms in South Manchester :ok:

I was probably the only person in the area to enjoy the sight of a white silhouette against a black sky--with the a££e end on fire :ok:

[sangiovese.]

Perhaps they were doing more than the speed of sound....... :E

Happy Christmas