Not tempted by secret hypersonics then? Are we really plumping for a 30 year old Italian design? Perhaps it was transporting aliens to Machrihanish then!!!!;)

I served at Machrihanish between ’77 and ’78 in ‘the hanger’. During the comings and goings I worked on more than 20 different a/c types and Nationalities. If you would like to know what really went on there I could brief you in a closed room, documents being for your eyes only. You may not carry any recording equipment or take any documents.
Btw I will have to kill you afterwards………

An improvement on the original Russian AT weapon?

https://en.wikipedia.org/wiki/Anti-tank_dog

That is an impressive war load! I had no idea they were so capacious.

They could actually carry 48 1,000 pounders. It was never tried though.

An Avanti what?

Maybe it is subjective, but I didn’t find your recording strange. That is why I have kept posting.
True, hypersonic flight was carried out by the US (X15). One thing however was that the a/c was badly burnt due to skin friction, parts that were made out of nimonic alloy!
Concorde: I would say the growling noise would be the reheat. It was used to take off, gain height and go through the sound barrier, past the transonic region and then back to dry thrust to accelerate to Mn 2.0.
The Lightning did make interesting noises, the first being the AVPIN starter. Dependent on the altitude, speed and engine setting they could make such a noise, it would vibrate through your back. That is personal experience again.
A replacement for the SR71: I believe that the military and Lockheed were convinced that it would be the last, fast recce a/c before the ‘spy in space’ took over.
There is so much written over secret projects, Area 51 and UFO rebuilds that does boggle the mind. An awful lot is just wishfull thinking or maybe mischief. RAF Machrihanish the British Area 51? Please……..

Stories about doughnuts on a rope contrails, I have actually witnessed that event once in the Netherlands. It was simply a normal commercial a/c that flew by. Something to do with the altitude, wind and weather conditions changed the line to an ‘Aurora’ trail after the a/c was long gone. As for the pulsating sound, well I have heard normal a/c make those sounds, again, not every time. I remember a Buccaneer making a pulsating sound, it had just swallowed a few seagulls though..

How many bomber spec Victors are on display? 0

XH648 is a B1A (K2P). It still had a bombing capability, should you want to drop another 35 1,000 pounders………..

An engine’s inlet guide vanes will cause a howl with the throttle near idle and aircraft in a descent.

Can you explain?