What sorta G Machine is this? Bloody Hell!!

_Tombstone_

OK, I'm (we) are all use to seeing this machine I'd say, the mighty Brian Cox in this one, gradual build up of Gs in this machine.

https://www.youtube.com/watch?v=mOyfrwbOFJ8

Clarkson here,

https://www.youtube.com/watch?v=NWBMYV6S5gA

But what are they in in these vids:eek:, it's instant 7/8/9Gs if they want

https://www.youtube.com/watch?v=lK8U8RZyzsM

https://www.youtube.com/watch?v=OE3mY5RSE5Q

lol, theirs loads of vids on youtube:D

ps200306

Well this one pops up in follow-on to the ones you posted:

Some of the comments seem to know what they're talking about and provide a link to this picture of a centrifuge:



Seems they're just capable of spinning up very fast. Looks like Coxy just got the namby-pamby treatment. :pac:

_Tombstone_

ps200306 wrote: »

Well this one pops up in follow-on to the ones you posted:

Some of the comments seem to know what they're talking about and provide a link to this picture of a centrifuge:



Seems they're just capable of spinning up very fast. Looks like Coxy just got the namby-pamby treatment. :pac:

Good vid that, not a bother to him. That's the machine alright I thought it would be going so much quicker, here's 6G from outside. Slow enough, where's the Pressure/Force coming from??

https://www.youtube.com/watch?v=o-BywEmKW8g

Here's a 2007 Article about the training that was going on in for the Space Runs, they were doing 20G for 54Secs back then which makes a laugh of vid above.

They actually did a 32G run for 25sec with near no side effects when they encapsulated the pod in water, they wanted to do 40G but machine couldn't handle it!!:eek::D

They were doing this at a place called Johnsville, it's a museum now, theirs a website but Google has a "This Site may be Hacked" notice on it. Here's a vid,

https://www.youtube.com/watch?v=h_nzsBGWZ0c

https://en.wikipedia.org/wiki/High-G_training

ps200306

_Tombstone_ wrote: »

That's the machine alright I thought it would be going so much quicker, here's 6G from outside. Slow enough, where's the Pressure/Force coming from??

https://www.youtube.com/watch?v=o-BywEmKW8g

Some people would call it centrifugal force, but that's not a "real" force as such. It's merely the manifestation of Newton's First Law -- an object in motion will continue in uniform straight line motion unless deflected by an external force. The test pilot's body is simply trying to do the natural thing: keep going in a straight line. But when forced to turn in a circle, that is sometimes inaccurately described as experiencing a centrifugal force flinging you outward.

Centripetal force, on the other hand is very real. That is the external force referred to in Newton's First Law that is doing the deflecting. The term is used when the object follows a curved path, and for this to happen the force must be pushing radially inward toward a centre point. From the test pilot's point of view the force is exerted by the back of his seat. For the centrifuge machine as a whole it's provided by the electric forces that hold the atoms of the gondola and the spinning rotor arm together (so you better make sure it's made of strong stuff! :eek:).

A force is a mass multiplied by an acceleration, so in the centripetal case we also have centripetal acceleration which, like straight line acceleration, is independent of mass. We've got several equivalent, fairly simple, expressions for centripetal acceleration:



where:

• v is the instantaneous straight-line velocity,
• r is the turn radius,
• ω is the angular speed in radians per second,
• T is the period of rotation.

Looking at the video, the centrifuge looks like it takes almost exactly two seconds for one rotation, so we can use that for the value of T in the last expression above. We're also told that the acceleration is 6G which, of course, is 6 times the gravitational acceleration at the earth's surface, of 9.81 metres per second squared. Rearranging from above:



So the rotor arm (from centre to seat back) is six metres, which looks plausible. We can also rearrange to get the straight-line speed of the pilot:



That looks plausible too.

_Tombstone_

Great post PS!