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# Pressure in the penis

The axial force is the easy one. Calculating the circumferential force is what I’m struggling with.

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In the previous example I used an internal blood pressure of 2.3psi (120mm Hg) to calculate an axial force of 4lb on the penis.

Of course it is the pressure difference between inside and outside the penis that causes the force. If 2.3psi of negative pressure (vacuum) is applied to the outside of the penis the same effect is produced as would be by the blood pressure in the previous example

A negative pressure of 2.3psi I think equates to about 4.7 in Hg vacuum, which rings a bell for the sort of figure required to maintain an artificial erection in a vacuum cylinder.

Feb 2004 BPEL 6.7" NBPEL ???? BPFSL ???? EG 5.65" Feb 2005 BPEL 7.1" NBPEL 5.8" BPFSL 6.9" EG 5.8" Feb 2006 BPEL 7.3" NBPEL 5.8" BPFSL 7.6" EG 5.85" Feb 2007 BPEL 7.3" NBPEL 5.8" BPFSL 7.5" EG 5.9"

Originally Posted by ModestoMan
The axial force is the easy one. Calculating the circumferential force is what I’m struggling with.

From previous calculations in this thread hanging 4lb probably creates roughly the same axial stress as is caused by pumping at 5 in Hg. Whatever that axial stress is let’s call it X (we can measure in N/mm or lb/sq.in. or whatever units of Force per Area we like)

Whatever that axial stress value, X, is, the circumferential stress in the case of pumping will be 2X and in the case of hanging will be zero. Assuming that the tunica confines the erect (or pumped) penis like a thin walled tube.

Feb 2004 BPEL 6.7" NBPEL ???? BPFSL ???? EG 5.65" Feb 2005 BPEL 7.1" NBPEL 5.8" BPFSL 6.9" EG 5.8" Feb 2006 BPEL 7.3" NBPEL 5.8" BPFSL 7.6" EG 5.85" Feb 2007 BPEL 7.3" NBPEL 5.8" BPFSL 7.5" EG 5.9"

Last edited by mbuc : 03-05-2005 at .

## OMG who designed this?

I’ve just been reading in the Wiki about the anatomy of the tunica surrounding the two corpora cavernosa. What interested me was that each corpora was surrounded by an inner layer of tunica which was strong in the circumferential direction but weak axially; there was also an outer layer of tunica which did not form two tubes but instead went round both corpora. This outer layer was orientated the other way from the inner one in the sense that it was weak circumferentially but strong axially.

By splitting the penis into two pressurised tubes and constructing them this way the penis, when pressurised, is equally strong in the axial and circumferential direction. Who ever designed our cocks was a frikking genius. Not only did they understand the stresses developed in pressurised thin walled tubes but they produced an incredible solution to equalise the axial and circumferential strengths!

Feb 2004 BPEL 6.7" NBPEL ???? BPFSL ???? EG 5.65" Feb 2005 BPEL 7.1" NBPEL 5.8" BPFSL 6.9" EG 5.8" Feb 2006 BPEL 7.3" NBPEL 5.8" BPFSL 7.6" EG 5.85" Feb 2007 BPEL 7.3" NBPEL 5.8" BPFSL 7.5" EG 5.9"

Mbuc,

This thing about the outer (axial) layer surrounding the two corpora, whereas the inner (circumferential) layer surrounds separate corpora is most interesting. Somewhere in this distinction we’ll probably find the answer to why certain practices are better for girth and vice versa.

For instance, if the jelg is essentially a weak, moving clamp - how does blood flow inside the corpora? I notice when jelquing that as I move my grip upwards, the pressure is greater closer to my grip; the pressure doesn’t equalize instantly, but more as a wave along the shaft. I presume there are constrictions to keep the blood from flowing freely. I assume that the lesson would be that forceful, fast jelquing will damage whatever it is that keeps the blood semitrapped inside the corpora.

Now, if we are jelquing at lower levels of erection, we will not have a full elongation, so the outer layer is not entirely stressed - and if you take a piece of textile (or Theraband) and pull it side-side, it is stretchable in the up-down direction to a certain amount. Now release the tension and the up-down stretch is increased. So if the outer (axial) tunica is not fully engaged, when you jelq you create a local swelling that is moving along the shaft, and at any given time the outer tunica can “give” a little more than it can when fully engaged. So the inner tunica will then take the force “all” on its own, and the outer tunica is stretched a little in the circumferential direction. But not lengthwise, right? I suppose this would make a case for semi-flaccid jelquing, but it could also be reasoned that the inner tunica is already strong and can handle the circumferential forces so by stretching the outer tunica in the circumferential direction you aren’t really gaining anything.

Got to think that one over a bit; but I still think that the answer to the success with Orange bends is lurking somewhere between the two tunicas…

By the way, I think it is time for Thunder to arrange a new forum (or subforum) for mbucs experiments and theoretical discussions.

regards,

Mgus, like you I find it hard to work out the processes, in terms of what’s going on inside the penis, in some of the manual exercises. I find it hard enough trying figure out what the application of a steady tension (hanging) or pressure (pumping or clamping) does.

The manual exercises can only ultimately create the same type of stresses as hanging or pumping but they do it in a dynamic and far more complicated way and usually for shorter time.

I wouldn’t care too much about the theory if only I found something that worked a bit faster than what I am achieving at the moment. I’m pinning my hopes on using heat to speed speed things up. I’ve only been using a rice sock for the last month and in another 2 months when I make an official measurement I’m hoping to see a surge in my gains. If not I’ll have to think about increasing the time and intensity of my routine.

Feb 2004 BPEL 6.7" NBPEL ???? BPFSL ???? EG 5.65" Feb 2005 BPEL 7.1" NBPEL 5.8" BPFSL 6.9" EG 5.8" Feb 2006 BPEL 7.3" NBPEL 5.8" BPFSL 7.6" EG 5.85" Feb 2007 BPEL 7.3" NBPEL 5.8" BPFSL 7.5" EG 5.9"

I think some people’s penises are stronger axially, and some are stronger circumferentially. Some people actually gain more length than girth from clamping. Weird, huh?

Gains have to do not only with the stresses that various exercises apply, but also with the strength and adaptability of the tissues along the different axes. Somebody with a really thick inner (circumferential) tunica might have a bitch of a time gaining girth but an easy time with length. Vice versa for the guy with a thick outer tunica.

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Mbuc,

If the heart can get up to 120 mm Hg, and

Originally Posted by mbuc
The total axial force on a thin walled tube which causes the axial stress on the wall of the tube is simply the cross sectional area of the tube times the pressure.

Imagine an erect penis. The blood pressure alone is causing the elongation and circumferential expansion of the penis. Once the penis is engorged to its erect state the tough fibres of the tunica resist any further expansion.

For a penis of diameter 1.5” with an internal blood pressure of 2.3psi (120mm Hg mercury) then the axial force on the tunica (assuming it takes all the pressure) is 3.14x0.75x0.75x2.3 which equals roughly 4lb. This force must be great enough to fully extend the penis to its erect length.

From experience of hanging in a flaccid condition I can confirm that 4lb is ample to axially stress the penis to the point where the tough fibres of the tunica resist any further easy elongation!

then the heart is able to get the axial force up to and beyond what is used in stretchers (recommended force 800~1500 grams if I recall correctly). So if you keep your hardon for twelve hours a day you’d have length gains??

Anybody have any idea as to if priapism leads to permanent enlargement?

Also, I was thinking that if you jelq in 3-second strokes, the “wave” in front of your grip - assuming that the overpressurized stretch is an inch - the average 6-inch unit would get a little less than a second an inch (this assumes that 1 inch is lost in pad pad and fingers, 1 inch is lost in the gland and 4 inches of tunica are being jelqed). So what you have then is about 1 second of pressure and another 3-5 seconds before next pressure wave. Not to far away from the JAI-stretches, is it?

regards,

Do you think if a surgeon made a series of very precise circumferential cuts through the outer tunica but left the inner one untouched the penis could be stretched out like a huge slinky?

Obviously it would be very weakened and probably burst very easily under pressure (maybe even at erection pressures!) but over time it may recover.

Feb 2004 BPEL 6.7" NBPEL ???? BPFSL ???? EG 5.65" Feb 2005 BPEL 7.1" NBPEL 5.8" BPFSL 6.9" EG 5.8" Feb 2006 BPEL 7.3" NBPEL 5.8" BPFSL 7.6" EG 5.85" Feb 2007 BPEL 7.3" NBPEL 5.8" BPFSL 7.5" EG 5.9"

<<then the heart is able to get the axial force up to and beyond what is used in stretchers (recommended force 800~1500 grams if I recall correctly). So if you keep your hardon for twelve hours a day you'd have length gains??

Anybody have any idea as to if priapism leads to permanent enlargement>> mgus

I’ve read reports of exactly that. Megalophallus was the term used for permanent enlargement caused by priapism in sickle cell anaemia sufferers. Whether it’s correct I don’t know because I would have thought there would be some good photographs of them in the medical world. I have never seen any and I think they would have turned up here if they existed.

Feb 2004 BPEL 6.7" NBPEL ???? BPFSL ???? EG 5.65" Feb 2005 BPEL 7.1" NBPEL 5.8" BPFSL 6.9" EG 5.8" Feb 2006 BPEL 7.3" NBPEL 5.8" BPFSL 7.6" EG 5.85" Feb 2007 BPEL 7.3" NBPEL 5.8" BPFSL 7.5" EG 5.9"

Originally Posted by mgus

Anybody have any idea as to if priapism leads to permanent enlargement?

It has in a few cases. But priapism is dangerous because, if left untreated, it causes fibrosis in the CCs, which can lead to permanent damage (like, no erections).

That’s why the makers of ED drugs caution you to seek medical attention if your erection lasts longer than 4 hours.

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Originally Posted by mbuc

Do you think if a surgeon made a series of very precise circumferential cuts through the outer tunica but left the inner one untouched the penis could be stretched out like a huge slinky?

“That idea’s so crazy, it might actually work!”

No kidding, I like it. The cuts would have to be staggered so that they reduce axial strength in a controlled manner. They would also have to be short enough so that they could heal without excessive scarring.

One potential drawback would be that scars tend to draw together the tissues around them as they heal. So, it’s possible one could end up with a shorter penis than that with which one started.

Intriguing idea, though.

A related idea, which I’ve been kicking around, is to partially cut the suspensory ligament, rather than completely transecting it. That would just make it weaker and easier to stretch, while still preserving the basic function of the ligament—stability and proper positioning of the penis.

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<<It has in a few cases. But priapism is dangerous because, if left untreated, it causes fibrosis in the CCs, which can lead to permanent damage (like, no erections).

That's why the makers of ED drugs caution you to seek medical attention if your erection lasts longer than 4 hours.>>MM

Is anyone doing long periods of light hanging or stretching (penimaster), over 4hrs, in danger of fibrosis? After all, like priapism, they are just another way of stressing the penis.

Are there any early warnings of fibrosis? I don’t want it :morose:

Feb 2004 BPEL 6.7" NBPEL ???? BPFSL ???? EG 5.65" Feb 2005 BPEL 7.1" NBPEL 5.8" BPFSL 6.9" EG 5.8" Feb 2006 BPEL 7.3" NBPEL 5.8" BPFSL 7.6" EG 5.85" Feb 2007 BPEL 7.3" NBPEL 5.8" BPFSL 7.5" EG 5.9"

Last edited by mbuc : 03-07-2005 at .

Originally Posted by ModestoMan
… The cuts would have to be staggered so that they reduce axial strength in a controlled manner. They would also have to be short enough so that they could heal without excessive scarring.

One potential drawback would be that scars tend to draw together the tissues around them as they heal. So, it’s possible one could end up with a shorter penis than that with which one started.

Actually, why stop at axial scarring? One could do the same for circumferential as well - if the cuts are short enough and evenly spaced, they will weaken the axial as well as circumferential equally. This would be achieved by needle holes at an even grid spacing. Remember the old torture instrument the spiked lady / iron lady? This thing would be known as the spiked pussy… Pretty gruesome. Imagine a thousand tiny jets of blood from your engorged member… I shudder.

Anyway, in order to minimize problems due to scarring, I will once again refer to my friend who was badly burned and had to wear a special suit to put pressure over the skin - the pressure made the cells in the skin regrow a-stochastically (all lined up) to minimize ugly scarring. Which brings us back again to wrist wraps to keep the pressure up from inside to allow scars to heal in a) a larger size b) minimizing stochastic cells (Disclaimer: This is my idea only - I have no research or medical links to back this up, other than that this explanation makes sense to me).

regards,

edit: What is fibrosis?

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