Pumping, and comparison of forces

PEforfun stated different tubes had certain forces at full pressure, smaller tubes having up to 20 pounds of force pressing into your pubic bone, larger tubes up to 50 pounds of force, is this in anyway comparable to the forces of hanging? Say I do a set of 5HG in a 1.75diameter tube, equivalent to maybe 5 pounds for 30 minutes, is that equivalent in any way to the forces of hanging 5 pounds for 30 minutes? Are the targeted structures different?

I don’t think there is any way to know what the pulling force is on your penis under pressure, but the force acting on your penis is equal over the entire surface.

The force of a small tube vs a large tube pressing into your body is a function of the vacuum acting over a larger surface area on the large tube, thus creating a larger force pressing it into your pubic bone when the internal pressure of each tube is the same. So even though the large tube is pressed to your body tighter, both tubes are pulling on your penis equally.

gotcha, so there is no real way to know the pulling force of pounds pumping exerts?

I think most of the lateral force of hanging is the tube pushing into the pelvis.

Very little of the Pulling force is on the internal structures of the penis.

The “pulling force” of a pneumatic or hydraulic vacuum is a multiply of te surface and the pressure difference between the medium surface (the penis skin) and the surrounding vacuum. So if you know exactly the surface of your penis affected by the vacuum you can well calculate it.

But as the direction of the force is not axial as in hangig, even in tightly packed tubes you will always have some lateral extension of the penis. Therefore, comparing to hanging seems futile to my opinion as the methods really are not compareable.

Yeah the long and the short of it is, hanging works for length, pumping not so much.

It’s more about targeting the right tissues for length targeting the ligs septum and eventually tunica, girth is really just tunica

If the penis fills the tube, the pulling force under vacuum is the same as a “piston in a bore”. Very simple geometry.

Pull force in pounds is (approx);
Diameter x diameter x inHg x 0.39

Where “diameter” is the INTERNAL diameter of the tube. (And is likely a bit smaller than the official tube diameter)

Would it fluctuate as the penis expands?

If the tube remains the same diameter, and the penis is still filling it, the force is based just on the vacuum in the tube.

So if you keep that vacuum constant the force stays constant. :)

No this isn’t true. Gprent is right. The penis is not airtight. a piston is airtight, that’s why pistons have to have sealing gaskets and it’s extremely important to have compression or a tight seal. A penis packing a tube is still not airtight, if it was vacuum pressure would increase the same instant you “packed” the tube or sealed it off among other things.

here is another top reason the penis is not suddenly turned into a “piston in a tube” the instant it packs the cylinder.

could we get an example calculation in here?

I already gave it in post #7.

Re the other discussion; a rubber piston in a tube still behaves like a piston in a tube. The pull force acting on the end of the penis (piston) is based on the pounds per square inch times the piston end area in square inches. The calculation I gave just uses a couple of math shortcuts so you don’t need Pi and inHg->PSI conversions etc.

Re sweeternut’s point about the tube pushing into the pelvis, that’s correct, the tube will push back into the groin with an equal and opposite force to the piston pull force applied to the end of the penis.

At low vacuum strength the penis can tend to jam and stick to the walls of the tube, which will negate some of the length pull force. There is still the same pull force applied to the end of the penis, but at the base ligaments there is slightly less pull force because of the jamming effect. Generally I negate that jamming effect in calcs because at higher vacuum and lots of lube the penis will move relative to the tube wall, especially because I milk the tube etc and ddeliberately cause movement of the skin against the wall.

Re packing the tube, if the tube is NOT packed, the length pull force applied to the end of the penis is the same calc, but based on the penis end area, which is smaller than the tube area. That’s a separate discussion, based on balloon or bladder physics but the calc is the same.

The vacuum tube would be the same as hanging weight. Physics. Really no way around that. I did a very quick and very simple figuring:

2.25 tube = 3.9761square inches of area
5 inHg in the tube = 2.455 pounds per square inch of force on the open end of the tube. This equals 9.761 pounds of force to pull against the penis and all ligiments under it. Even if the tube is not packed the force is still pulling skin and anything else into the cylinder with this 9.761 pounds of force. Soooooooo……. Pumping IS the same as hanging in this matter.