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Tube Size Being Relative to Gains

Tube Size Being Relative to Gains

I originally posted this here:This Works (Dynamic Stretching) ,but was told to make a seperate thread.

It always seemed to me that gain was somehow governed by the size of the tube. Has this been addressed before?

What I mean is this: I have noticed that actual length gains were about 1/8-1/4 inch less than the stretched length. Also - I am not sure of actual measurement here - it seemed to apply to girth. So in the same way that say the size of a turtle for example is governed by the size of it’s habitat - it will only grow so large based upon the tank size - I wondered and it seemed the penis in regard to pumping is similar. Are gains in pumping governed by penis size % in the tube?

I know that the theory with static pumping is to pack the tube and this will result in stretching it. But, it seemed to me regarding this type of pumping that the tube needed to be slightly larger in both length and width. Never hitting the end or the sides.

On my second try that I mentioned as an old guy I started with a 7 1/2” tube. As I started to get close to the end it seemed that my gains slowed a bit. I then bought an 8” tube and things picked up again. I don’t really know if what I am getting at is true but it has SEEMED this way to me from observation.

So, I am wondering if this has been discussed before. Does it have to do with the dynamics of a tube and loss of properties as one gets close to touching the parameters, is it related to the penis size in relation to tube - like a turtle, or something completely different? I don’t know but I am interested in anyone’s ideas.

I hope I have explained myself…


Last edited by HomerJS : 03-21-2014 at .

I must admit I have never understood the point of packing a tube. From a simple fluid mechanical perspective, it reduces the radial stress and doesn’t increase the lengthwise stress. The force exerted by a pressure is normal to the surface so the forward pull of the vacuum goes through the glans and is entirely dependent on the projected area (of the shaft, not the glans). Now, if you can make your shaft expand beyond the glans that will add to the lengthwise stress but this will be put on the skin and won’t be of much use. Plus, it’s a small effect compared to what happens in your glans.

There’s no physical phenomenon that would change the force you’re experiencing based on the length of the tube if you’re not actually touching the end. Regarding your experience my best guess would be that it has something to do with the sensitivity of the pump. With a larger volume of air in the cylinder, the pressure will change slower (the pump is effectively less sensitive) and this may cause you to pump to a stronger vacuum if you’re going by feel. If the circumference is also larger there’s the added possibility that it sits differently at the base, which can also cause a perceived increase in the length you reach.
But as long as you’re not in contact with the sides, the actual size of the tube shouldn’t matter.

Originally Posted by Serenity73
I must admit I have never understood the point of packing a tube. From a simple fluid mechanical perspective, it reduces the radial stress and doesn’t increase the lengthwise stress. The force exerted by a pressure is normal to the surface so the forward pull of the vacuum goes through the glans and is entirely dependent on the projected area (of the shaft, not the glans). Now, if you can make your shaft expand beyond the glans that will add to the lengthwise stress but this will be put on the skin and won’t be of much use. Plus, it’s a small effect compared to what happens in your glans.

There’s no physical phenomenon that would change the force you’re experiencing based on the length of the tube if you’re not actually touching the end. Regarding your experience my best guess would be that it has something to do with the sensitivity of the pump. With a larger volume of air in the cylinder, the pressure will change slower (the pump is effectively less sensitive) and this may cause you to pump to a stronger vacuum if you’re going by feel. If the circumference is also larger there’s the added possibility that it sits differently at the base, which can also cause a perceived increase in the length you reach.
But as long as you’re not in contact with the sides, the actual size of the tube shouldn’t matter.

Well, my theory is that penis growth is governed by tube size. So, it will only grow and expand to a certain percentage of the tube size or volume. Therefore to keep growing one must keep moving up in tube size. When one gets to a certain pct of growth within the tube things slow down.

Originally Posted by HomerJS
On my second try that I mentioned as an old guy I started with a 7 1/2” tube. As I started to get close to the end it seemed that my gains slowed a bit. I then bought an 8” tube and things picked up again. I don’t really know if what I am getting at is true but it has SEEMED this way to me from observation.

I think it was a coincidence. If you were pumping to the same pressure there was no difference in the forces on your unit. There is definitely something to be said for working towards a goal that is slightly out of reach, being able to run a bit faster when you’re chasing somebody, or PE a bit more by lengthening the ‘finish line’ in the tube. But physically, there’s no difference depending on tube size (except in comfort) until you actually hit the end of the tube, or pack the sides of the tube.


Before 5.5" x 4.1" volume 7.3 ci ////// Now 7.4" x 4.9" volume 14.1 ci

The tissues in your penis have no idea whether the edge of the tube is 0.1 cm away, or 10 cm away from the skin. However, when you cross over into packing the tube girthwise (or running into the end in the lengthwise direction), then you turn into the turtle growing in a small tank.

So no, pumping gains are not governed by % of the tube filled. But they are affected by whether you choose a tube size where you’re packing it girthwise, or not. That debate is as old as pumping itself, and there are plenty of threads on it.


Before 5.5" x 4.1" volume 7.3 ci ////// Now 7.4" x 4.9" volume 14.1 ci

Originally Posted by BeardedDragon
The tissues in your penis have no idea whether the edge of the tube is 0.1 cm away, or 10 cm away from the skin. However, when you cross over into packing the tube girthwise (or running into the end in the lengthwise direction), then you turn into the turtle growing in a small tank.

So no, pumping gains are not governed by % of the tube filled. But they are affected by whether you choose a tube size where you’re packing it girthwise, or not. That debate is as old as pumping itself, and there are plenty of threads on it.

Not so sure I agree :)

Why do you disagree? The physics of the situation is fairly straightforward. Maybe your observation is a correlation and not a causation.


Before 5.5" x 4.1" volume 7.3 ci ////// Now 7.4" x 4.9" volume 14.1 ci

So can someone verify what is being asserted ? :

Are long time pumpers saying that having a tube where you fill out most it, girth wise, and most of the pressure and expansion then occurs on the tapered part of the shaft (near the head), and the glans ?


Current size: BPEL: 7.9" EG: 6.75"

Realistic goal: BPEL: 9.25" EG: 7.5"

Unrealistic surgical goal: 12" x 8.5" :)

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