Have you seen

[Jonny Suave Trousers]

A "pulse jet", you may have heard of project Aurora?

Media type here, just wondering if anybody here has ever had a sighting?

Cheers.

[chiglet]

Yes, the Fieseler Fi103 "Vergeltungswaffe Einz" (Vengeance Weapon 1).
Seen at Duxford, and elsewhere.

[Agent153Orange]

Agreed, the V-1 was the only aircraft so far to use pulsejets (although there have been some proposals to use pulsejets for high-supersonic military aircraft). AFAIK (which ain't much) the Aurora project (which AFAIK was cancelled because of high cost) used a turbojet/ramjet combo fuelled by liquid methane, rather than pulsejets (which are less efficient at all speeds than turbojets or ramjets).

[treadigraph]

Aurora was the code name for the B-2 programme funding. Or so said Ben Rich in his autobiography.

[Agent153Orange]

Really? I thought it was a project for an SR-71 replacement. Looks like the Pentagon really succeeded in pulling the wool over my eyes (and most other people's eyes as well).

[treadigraph]

Yes, we all thought that but, so far as I am aware, there was never anything other than rumour - I can't recall ever seeing a solid fact on the subject of an SR-71 replacement. Ben Rich claimed in his book that Aurora was B-2 related and he should know - unless of course it was an excellent piece of disinformation!

Regarding the famous "donuts on a rope" vapour trails, all the pics I've seen which are claimed to illustrate the phenomenon appear to show ordinary vapour trails that have fluffed out for whatever reason - I've seen this happen on many occasions and they were all left by airliners or military transports. In fact I'm looking at one overhead right now - the right hand trail is classic "donut on a rope", the left more fluffy.

However, I have little doubt that there are projects in the black programme that we don't know about yet!