Internet Video Thread

[Evil_Onyx]

Star Wars Music Indian Tribute

 

[Urwumpe]

How to do really screw things up:

Looks like the cameraman had been stuck with another truck and thus was unable to escape.


(I really love that sound of the wind, was really a while that I heard it myself. )

 

[Graham2001]

Come on feel the noise...

Russian Radial Engine Start and Run

​

 

[Artlav]

Come on feel the noise...

Now that's a 1000hp blast from the past.
Looks like pre-WW2: https://en.wikipedia.org/wiki/Shvetsov_ASh-62

 

[Graham2001]

Behold the Beastikiller

[youtube="Restarting an old abandoned ISU-152]Xd7gy5Aof0U[/youtube]​

 

[Thunder Chicken]

Green screen mixed reality. Wow. Some green cloth and a cheap stick/rudder setup and you could have some crazy good simulation.

 

[Graham2001]

From the files of ""...they don't make them like that any more..."

WWII D4 Caterpillar Bulldozer - First start in 20 years.

1971 Terex 82-40 Dozer - First start in 20 years.

Caterpillar Bulldozer D6 9U - First start in over 7 years.

​

 

[MaverickSawyer]

Come on feel the noise...

Russian Radial Engine Start and Run

​

Needs a test club prop... :facepalm:

 

[Graham2001]

Needs a test club prop... :facepalm:

Probably disallowed(sic) by EU law as being 'too dangerous'...

Then again...

Sabre Jet Engine: first start

Bristol Hercules demonstration

Testing a Starfighter Engine

​

 

[Andy44]

Since we're posting vids of old, awesome machines, here's one of the two actual 1960 Peterbilt model 281 used in filming the Steven Spielberg film "Duel", a 1971 film about a guy (Dennis Weaver) being stalked on the highway by a seemingly demonic tanker truck. This thing is a beast and scared me when I was a little kid. How cool that some guy not only keeps it running, but in the condition it was in the film, too. And the video he made of it is very ominous, too, done in the style of the film.

 

[Evil_Onyx]

 

[C3PO]

I almost posted this in the retro tech thread.

It gives a nice insight into the guidance.

 

[jroly]

AARP MOVIE AWARDS - BEST DOCUMENTARY (The last man on the Moon, Gene Cernan)

https://aarpshare.app.box.com/s/5bjoccm6zs9s8gzb6nb96xlqe336p85e

I would like to watch the Movie when it comes out on video.

 

[Quick_Nick]

[ame="http://www.youtube.com/watch?v=U-xlttsfWn4"]Looking down the throat of a German V-1 Pulse Jet Engine - YouTube[/ame]

 

[Andy44]

I thought a pulse jet had to be moving to run so the airflow pushes past the forward vanes?

 

[Artlav]

That's for a ramjet, where compression is achieved by deceleration of the incoming air stream, with subsequent combustion like in a turbojet.

A pulsejet is a fluid dynamics hack - the combustion sucks the air from one side and sends it out of the other thanks to the inertia and a special shape of the engine (or a valve at the intake, like in the V-1 engine).

 

[Andy44]

Is there a partial vacuum created in the combustion chamber after each pulse? Is that what sucks air in through the front vanes? That video doesn't show how they started it, either.

 

[Artlav]

The way i understand it, the fuel combusts with a boom, creating overpressure that expands. On one side of the engine there is a big opening, on the other side - a small one.
The pressure moves the air out of the big opening, and the motion and cooling of air leaves a partial vacuum behind. Inertia of the moving air prevents it from stopping and reversing faster than the vacuum could be filled by fresh air entering from the smaller opening, which does not have a big mass of moving air in the way.

This can be achieved by two means - either a valveless that works as described above purely on the shape, or with a valve, which is held closed while the pressure is high, and then opens up as it drops, letting the fresh air into the back of the combustion chamber.

V1 is the second type, which is slightly more efficient, but somewhat less elegant and reliable (valves break, valveless have no moving parts at all).

 

[Andy44]

I seem to recall discussing something earlier that made me think of this stuff, but I couldn't remember what it was called, but I've found it: Black MIDI

 

[MaverickSawyer]

Is there a partial vacuum created in the combustion chamber after each pulse? Is that what sucks air in through the front vanes? That video doesn't show how they started it, either.

Yep. Usually, you need to give it some airflow to get it started. some pulse jet enthusiasts use leaf blowers, and the V-1 used either a catapult or an air drop to get it running.