@ufogoblin

Hi Elizabeth, thanks for starting this thread and inviting me to the forum. you should DEFINITELY add a conspiracies forum btw.

This is a good topic - Black triangles are some of the most interesting and consistent of all UFO sightings, though usually it's frustrating to sort out genuine sightings from what is just military aircraft of which many US aircraft match that profile like the B2 stealth bomber, the Nighthawk and the Aurora just as a few them. Simple, angular profiles work better for stealth aircraft as it make it better for the radar to bounce at an angle. Many theorized successor aircraft would definitely have a similar profile- and that is probably the best theory on black triangle craft so far is that it's a military black project. Much, much speculation has been done on this and how crafts of this size (most commonly reported estimations are the size of a football field) could be possible be powered. There are two main theories on this. One is an ultra light blimp, or the 'stealth blimp' concept used for night time reconnaissance. The second is that it's powered by a nuclear reactor, or an antimatter reactor or something similar, or alien technology.

Nuclear is definitely a possibility but probably only recently. In 2015 (if i remember right) lockheed and martin skunk works had only recently announced their plans to build what was something like a semi trailer sized nuclear fusion reactor. This would be perfect, but as for 25 years ago? I just doubt they could have had it for that long.

More hard to explain would be the propulsion mechanism. Most of the time, they're reported as very very quiet, with only an ambient hum sound. In a lot of UFO cases, an eerie quiet is made note of - This is often called the 'OZ factor' (named from the land of oz, as in the wizard of oz) and includes the feeling of isolation and the noises of the wild life and everyday life also being muted.

So, assuming this was a heavy craft and a black project, it would be amazingly advanced and efficient and for the most part, could mean that the US had developed some kind of space craft. They're also seen it pairs a lot - like in your first link. So they would have to have a couple of these. The expense for this would be totally crazy. For an aircraft, which fills mostly a reconnaissance role and is never seen in the combat - unless it has nukes, or is some kind of drone platform, or is for some other role.

As for an actual blimp, this too, kind of falls apart once you consider the sightings in depth, as they can often be seen changing speeds very fast, although it could be some kind of hybrid technology.

The peak of these sightings were in the late 80s or early 90s, and took place in Belgium. This was known as the Belgian ufo wave. Very concentrated reports in that country over a couple of nights and the craft was monitored and pursed in car by two police. During this time it was observed making very sudden increases in speed, being able to stop and hover.

On this night there were about a thousand sightings, and during this they also got it on radar. So they scrambled F-16s to intercept and every time they got target lock, it was able to get out of it somehow, and supposedly witnesses who saw this from the ground say it was a moving at very high speeds. But this could also be due to countermeasures. In the radar data, at one point the ufo ends up going below the ground also. Which could be a sign of interference with the radar or false readings. I think I saw an inteview with the pilot, who seemed to either think it had evaded this way, but they had radar data of it being there from the f-16s. The US denied any involvement of being in the belgian airspace.

A more popularized black triangle incident is the Phoenix lights event from Arizona. That in actuality, what's mostly presented is the video of military flares above the mountain which were said to be from a 'training exercise'. But in during this time there were a huge amount of sightings of a delta shaped, very large craft with large wells of light on the underside. I think flares were probably launched in response to this or to misdirect the media.

And another I can think of that involved a triangle craft was something called the Sheffield incident - which is less known. In england in the late 90s, there were many witnesses of a triangle UFO being 'escorted' or observed by a helicopter and eventually pursued by jets. Supposedly this involved the destruction of some air craft, and one witness claims to have met an airforce pilot who had ejected too. But besides the witnesses no airforce base ever admitted this happening.

An explanation besides military or alien craft which is worth mentioning is this weird as hell theory about weather phenomena, in this case during storms supposedly there is a type of polygonal like plasma that can form, and looks like solid geometry. If this is legit it could explain some instances of a black triangles, but nothing as involved as any of those mass sightings, where people see details on the craft, windows and parts and such consistency, with the three lights on the corners and one the middle. This is often paired with another theory of electromagnetic disruption from a storm as effecting the temporal lobe and inducing hallucinations or memories of alien abductions and can be said to cause alien abduction experience. I just don't think there's enough research done on this or see how this could be happen so much, or creating such consistency with alien reports to even begin to be satisfactory explanation for that.

So in my opinion either they're alien or a really amazing stealth craft which won't be revealed because of the cost (but I doubt it).

The frequency of ufo activity is usually a lot more during the day. The number of sightings is high at night. But this is also when the most misidentification can happen. UFO abductions happen mostly, but not always at night time. I think this is because this is the best time to take someone out of their environment when they won't be missed. So imo alien use this well to their advantage.