looping the loop - with a difference.

[mrmr96]

Simpo Two said:

mrmr96 said:

If you've 1g of centripetal force then you'd fall. You need >1g to overcome gravity when you're inverted, and hence keep you in your seat.

I'm not sure whether one's G is what you actually experience, or whether you have to add +1 to everything. So if you are upside down, then a total force of... damn this is complicated!

If a fast car has 2G's of acceleration then you'll feel 2G's horizontally and 1G vertically (like always).
The "vomit comet" aeroplanes which let passengers go weightless must accelerate towards the ground at 1G, so you have -1G from the plane and +1G from the earth and you're weightless. However at the bottom of the parabolic flight the plane pulls +1G as it reverts to climb, and the passengers feel 2G. Simple stuff really.

[Simpo Two]

So if you're upside down in a loop (aeroplane) and feel your normal weight through your butt (ie acting upwards), is that 1G or 2G?

[mrmr96]

Simpo Two said:

So if you're upside down in a loop (aeroplane) and feel your normal weight through your butt (ie acting upwards), is that 1G or 2G?

The plane is pulling 2G, you're feeling a net 1G.

[RDM]

You've gotta love PH...we're now discussing pulling 2g in a submarine......

That's why I'm here...

[Simpo Two]

mrmr96 said:

The plane is pulling 2G, you're feeling a net 1G.

OK, ta, So the plane could pull 1.1G and you'd still stay put at 0.1G net.


So... as a plane is subject to 1G just parked on the runway, it only needs another 0.1G to do the job...?

[mrmr96]

Simpo Two said:

mrmr96 said:

The plane is pulling 2G, you're feeling a net 1G.

OK, ta, So the plane could pull 1.1G and you'd still stay put at 0.1G net.

Yes, it would feel a bit "floaty" at a net 0.1G but essentially, yeah.

Simpo Two said:

So... as a plane is subject to 1G just parked on the runway, it only needs another 0.1G to do the job...?

Erm, what?

[rhinochopig]

Simpo Two said:

So if you're upside down in a loop (aeroplane) and feel your normal weight through your butt (ie acting upwards), is that 1G or 2G?

And bizarrely your eyes tell you (well it was my experience at a transient 6g) that you're stationary whilst the world is revolving around you

In fact it's like the world has been painted on the inside of a giant beach-ball. A most odd experience.

[Simpo Two]

rhinochopig said:

And bizarrely your eyes tell you (well it was my experience at a transient 6g) that you're stationary whilst the world is revolving around you

In fact it's like the world has been painted on the inside of a giant beach-ball. A most odd experience.

Well having been inverted in a glider, I'd say it's more like having the sky under your feet and the ground above your head. But I agree 6G could distort your vision!