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Digitally controlled constant strain extender

Originally Posted by dickwut
Hi! Good to see you back. I’ve finally gotten caught up on most of these US threads/logs and was looking forward to your return. I sent a PM a week or so ago, but now that you’re back on here, easier to just post on here. Were you planning to compile an official parts list any time soon for those of us who see this as too overwhelming to begin on our own? It looks like, for example, the Totalman extender you were using is different from the one sold now, and Tutt’s recommended weight scale is not available (though he did recommend a different extender that appears to be in stock).

I’ve begun some light FIR hanging, but do see this as a much better and less time consuming method, if I could manage to get a machine together for it.

Awaiting my return? You have me feeling special, lol.

I’ve had probably over a dozen messages about this - I’m not sure how everyone missed the list of parts I already uploaded in this thread along with the CAD file. Check Post #49 and you’ll see a 7z file.

Okay - I just checked and realized that I uploaded the list of SKUs in an excel sheet (Post #49) but I can’t find the CAD file. Give me a couple of days and I promise I’ll provide the SKUs and CAD file so plus a few steps on how to build. I’ll also summarize my routine and I hope @Tutt can jump in and just double check it for us.

Yes, totalman has changed his design. I think you’ll come out better with a cheap extender from ebay anyway since they use a flat base ring which allows the US head to cover more shaft, vs my totalman ring which is super thick - solid design but picks up lots of space on my already short shaft during a session. So one like this: US Pro-Male Penis Extender Enlargement System Man Enlarger Stretcher Enhancement | eBay

My only caution is that depending on the vacuum cup you’re using, it may not fit through the ring which means you’ll be forced to either expand it’s circumference with a heat gun, or put your penis through, then attach your vacuum cup, etc.

Re: Routine - the only uncertainties I had and wanted some confirmation on from @Tutt was:
1) What heat thresholds we should hit at different load milestones - from rereading some threads, this is what I think:
We’re starting heat from 0.5kg - by the time we hit 1kg, we should be at 39°C at least, by the time you hit 1.5kg you should be at at least 40°C, then once you hit max load, you should be at 41-42°C. Is this correct?

2) For every subsequent session, should we use our starting point (i.e. where we’re very careful of strain rates) by load (0.5kg) or by length (50mm below last session’s BPFSL at max strain)?

3) Should I end a session based on max load, or based on length, i.e. when BPFSL is 2-3mm more than the last session’s max? (of course, if load hits max before this, then that should take precedence)

Originally Posted by dickwut
Hi! Good to see you back. I’ve finally gotten caught up on most of these US threads/logs and was looking forward to your return. I sent a PM a week or so ago, but now that you’re back on here, easier to just post on here. Were you planning to compile an official parts list any time soon for those of us who see this as too overwhelming to begin on our own? It looks like, for example, the Totalman extender you were using is different from the one sold now, and Tutt’s recommended weight scale is not available (though he did recommend a different extender that appears to be in stock).

I’ve begun some light FIR hanging, but do see this as a much better and less time consuming method, if I could manage to get a machine together for it.

Oh, forgot to mention - try sites other than Amazon to see if you find it. If you resort to finding an alternative, ensure that there’s a feature to keep the device on (i.e. to disable auto-shut off after X minutes).

Originally Posted by nshaq
@Easygainer
Have you thought about replacing the fish scale for measuring the pulling force with a load cell that feeds the data to your arduino board ?

I will be building something similar that fdersby built, but I will use an ESP32 controller, which is very similar to an arduino board. The ESP32 has a WiFi integrated and it also has a web server on the board.
I plan to use a simple load cell from Aliexpress that is based on HX711 IC instead of the hanging scale. It will send the load data to the ESP32 in real time, and ESP32 can display that on the webpage as a gauge. This means that you can connect the phone to the ESP32 using WiFi, and continously check the load.
You could also use that load data from the load cell to make automatic changes with the stretching protocol. You could tell the ESP32 to keep the strain rate at 1%/min until it reaches 1kg, and then automatically reduce the strain rate to 0.5%/min. Then after it reaches your 0.17MPa load, it would automatically stop extending and just hold.

I have not…didn’t know that was possible. I’m not well versed in arduino/electronics. I hired someone off of a freelancing site to design what I needed to get this far.

If you can achieve what you’re suggesting then that might make for yet another step toward optimality and automation.

That said, on the hierarchy of importance, the two factors atop the list are: 1) heating tissues to 41-42°C and 2) slow strain rates of <1mm/min - the fish scale does a fantastic job monitoring temperatures, and the <1mm/min rates my machine, fdersby, and Tutt’s devices can achieve should be more than good enough - I’m not sure that looping load data to control strain rate further is going to be a huge step forward given that our devices are already at <1mm/min. In terms of automating the strain rates, you can, but for me, I just press about 4 buttons to control my device throughout the session. I won’t discourage you from trying - I just want to clarify to other readers that it’s icing on the cake that isn’t going to add much benefit.

One other thing is that you’ll have to solve the problem of imperfect heating. If heat drops for one reason or the other (momentary poor contact, US Pro times out, stop to add lube, etc) and the registered load changes (due to stress-relaxation) that data will be fed to your device and then want to adjust the strain rates accordingly. The question is, how do handle those jumps in load that were not intended? Just something to think about if you proceed.

Originally Posted by dickwut
Hi! Good to see you back. I’ve finally gotten caught up on most of these US threads/logs and was looking forward to your return. I sent a PM a week or so ago, but now that you’re back on here, easier to just post on here. Were you planning to compile an official parts list any time soon for those of us who see this as too overwhelming to begin on our own? It looks like, for example, the Totalman extender you were using is different from the one sold now, and Tutt’s recommended weight scale is not available (though he did recommend a different extender that appears to be in stock).

I’ve begun some light FIR hanging, but do see this as a much better and less time consuming method, if I could manage to get a machine together for it.

Oh by the way, Tutt repeatedly suggested that you should never subject your penis to a 1kg load at a temperature lower than 39°C - so if you’re hanging I hope your FIR method is producing at least that much. Also, hanging by it’s very nature causes a super high strain rate. You might be causing toughening with your protocol if you’re not getting that critical heat range and using slow strain rates - maybe wait a bit until you build a device?

Originally Posted by easygainer
Oh by the way, Tutt repeatedly suggested that you should never subject your penis to a 1kg load at a temperature lower than 39°C - so if you’re hanging I hope your FIR method is producing at least that much. Also, hanging by it’s very nature causes a super high strain rate. You might be causing toughening with your protocol if you’re not getting that critical heat range and using slow strain rates - maybe wait a bit until you build a device?


Thanks. Yea I’m not sure exactly how hot I’m getting internally, but the pad I’m using is plenty hot. I’ve made some decent quick progress, though strain rates are low, but that could because there’s probably 10 min after I finish before I put things away, un-tape, and measure. Don’t know if that’s too long. I’m just barely hitting the .1 weight range at the end after slow increases. Nothing heavy yet.

Did you end up doing the US 2000? Model?
Ever get your phantom set up and working? I’m curious how you use that with the vac cup. I use the Total Man ones and even with not a lot of extra sleeve, there are only like 2 inches of the shaft uncovered. With a phantom, wouldn’t it be solid contact on the sleeve, then a big gap where your sleeve ends and the surface drops down to the shaft? How would you maintain a solid smooth surface everywhere?

Originally Posted by easygainer
Oh by the way, Tutt repeatedly suggested that you should never subject your penis to a 1kg load at a temperature lower than 39°C - so if you’re hanging I hope your FIR method is producing at least that much. Also, hanging by it’s very nature causes a super high strain rate. You might be causing toughening with your protocol if you’re not getting that critical heat range and using slow strain rates - maybe wait a bit until you build a device?

I think it would be better if instead of load in kg, we would use the load in MPa, cause this is what is more or less universal to all of us in regards to anatomy. While elastic region starts around 0.17MPa for all of us, this could mean 3.3Kg for someone, while it could be 2.5Kg for another person. In this regard, I think it was said to not subject our penises to loads higher than 0.10MPa without heat, and not 1kg.

Originally Posted by easygainer
I have not.didn’t know that was possible. I’m not well versed in arduino/electronics. I hired someone off of a freelancing site to design what I needed to get this far.

If you can achieve what you’re suggesting then that might make for yet another step toward optimality and automation.

That said, on the hierarchy of importance, the two factors atop the list are: 1) heating tissues to 41-42°C and 2) slow strain rates of <1mm/min - the fish scale does a fantastic job monitoring temperatures, and the <1mm/min rates my machine, fdersby, and Tutt’s devices can achieve should be more than good enough - I’m not sure that looping load data to control strain rate further is going to be a huge step forward given that our devices are already at <1mm/min. In terms of automating the strain rates, you can, but for me, I just press about 4 buttons to control my device throughout the session. I won’t discourage you from trying - I just want to clarify to other readers that it’s icing on the cake that isn’t going to add much benefit.

One other thing is that you’ll have to solve the problem of imperfect heating. If heat drops for one reason or the other (momentary poor contact, US Pro times out, stop to add lube, etc) and the registered load changes (due to stress-relaxation) that data will be fed to your device and then want to adjust the strain rates accordingly. The question is, how do handle those jumps in load that were not intended? Just something to think about if you proceed.

I know what you mean regarding the heat, but in this case the strain rate would be controlled by load from the scale. So after a certain load, regardless of heat, the strain rate would decrease automatically. There is no concern for the strain rate to switch back to the previous setting if the load is continuously increasing.

I am going to explain everything that I am planning for this in my own log, but I find your place great to discuss ideas further. At the moment I am waiting for most parts to arrive from Aliexpress. Although the device will have more components in the end, and a bit more of programming involved, I still think it will allow for optimal and easy execution of the stretching protocol - an evolution of the existing devices

Originally Posted by nshaq
I know what you mean regarding the heat, but in this case the strain rate would be controlled by load from the scale. So after a certain load, regardless of heat, the strain rate would decrease automatically. There is no concern for the strain rate to switch back to the previous setting if the load is continuously increasing.

I am going to explain everything that I am planning for this in my own log, but I find your place great to discuss ideas further. At the moment I am waiting for most parts to arrive from Aliexpress. Although the device will have more components in the end, and a bit more of programming involved, I still think it will allow for optimal and easy execution of the stretching protocol - an evolution of the existing devices


Hi, I see from your log that you have a phantom as well. How do you deal with the surface gap between the vacuum sleeve and shaft where the sleeve ends, too?

amazing to see you back!

I am 100% committed to building your device.

I already spent a few hours witk Autodesk 360 and tried to create my own 3d model but it turned out subpar.

I am so excited for your new infos :-)


[before PE] Start BPFSL: 17.6cm (6.93 inches) start BPEL: 16.7cm (6.57 inches)

[currently stagnating, work in progress] latest BFPSL: 21,2cm (8,35 inches) latest BPEL: 19,1cm (7,52 inches)

Click here to see my amazing US progress report (always updated!Kyrpa's methodology) ;-)

Originally Posted by dickwut
Hi, I see from your log that you have a phantom as well. How do you deal with the surface gap between the vacuum sleeve and shaft where the sleeve ends, too?

Hi,
I put extra effort in making the sleeve very short, while still making sure it holds vacuum. Luckily with this method we don’t need high tension, so there is no need to make the sleeve cover a lot of shaft in order to hold vacuum. I also used a vacuum bell that is a bit tight, so its smaller in size compared to what I could be using. Tight vacuum bell holds vacuum better and reduces the chance of blisters. All of these together with the strain extender give me around 5 inches of shaft to work with at max tension, without the need to go over the sleeve at all. This way very little length is unheated near the glans, and I consider that some kind of buffer zone, so I don’t spread the heat inside the vacuum bell and cause unnecessary blistering.
I needed a bit of trial and error for the sleeve length, in order to see how much I can get away with, without losing the vacuum.

You could also use phantom material that is softer and just press it a bit harder into the shaft near the area where the sleeve starts. There wouldn’t be much gap there, and it could just be filled with US gel easily.
When I poured my latest phantom out of Dragon Skin 20, I added around 10% of their Silicone Thinner to the mix. The phantom came out much softer than the one without thinner.

Originally Posted by dickwut
Thanks. Yea I’m not sure exactly how hot I’m getting internally, but the pad I’m using is plenty hot. I’ve made some decent quick progress, though strain rates are low, but that could because there’s probably 10 min after I finish before I put things away, un-tape, and measure. Don’t know if that’s too long. I’m just barely hitting the .1 weight range at the end after slow increases. Nothing heavy yet.

Did you end up doing the US 2000? Model?
Ever get your phantom set up and working? I’m curious how you use that with the vac cup. I use the Total Man ones and even with not a lot of extra sleeve, there are only like 2 inches of the shaft uncovered. With a phantom, wouldn’t it be solid contact on the sleeve, then a big gap where your sleeve ends and the surface drops down to the shaft? How would you maintain a solid smooth surface everywhere?

Re: Heating - there was some discussion about the surface getting really hot but internal temperatures being below where it needs to be. I remember reading that with some superficial heating methods, you’d cook the surface of your penis before the inside reached 41-42°C - but not sure whether that was regarding FIR…maybe search Tutt’s posts and see.

Yes, I’m using the US Pro 2000 2nd edition.

I did get my phantom working! At first it was cylindrical and my penis would go in the middle but then I cut it down the middle so that now it’s like a slide? Not sure how else to describe that. Basically it’s shaped the way everyone else’s own is and sits on the stop half of my shaft vs enveloping the entire thing.

My vac cup was one of the cheap ones off of ebay and that was yet another reason for my delay - I quickly realized that it wouldn’t work for me so I ordered something else which took about 2 months for me to receive in-hand. I’m a huge shower, so when I’m ready to apply heat, I have very little visible shaft. I mean, you’d laugh if you saw my first phantom (it was like 1 inch, lol). So you can imagine how problematic it was when my extender sleeve was picking up room on my limited runway. I bought the VacHanger 3 Kit from autoextender which worked great in my first session. I used water to fill the vacuum instead of tape which was a bit tough to set up since autoextender changed their design but still waaay easier than taping. So there’s no sleeve picking up my shaft space. The silicone cone is picking up just a few mm behind my glans. Very strong, no slippage.

Originally Posted by nshaq
I think it would be better if instead of load in kg, we would use the load in MPa, cause this is what is more or less universal to all of us in regards to anatomy. While elastic region starts around 0.17MPa for all of us, this could mean 3.3Kg for someone, while it could be 2.5Kg for another person. In this regard, I think it was said to not subject our penises to loads higher than 0.10MPa without heat, and not 1kg.

Hmmm, let me revisit my notes on MPa and give that some thought. Thanks for the suggestion.

Originally Posted by nshaq
I know what you mean regarding the heat, but in this case the strain rate would be controlled by load from the scale. So after a certain load, regardless of heat, the strain rate would decrease automatically. There is no concern for the strain rate to switch back to the previous setting if the load is continuously increasing.

I am going to explain everything that I am planning for this in my own log, but I find your place great to discuss ideas further. At the moment I am waiting for most parts to arrive from Aliexpress. Although the device will have more components in the end, and a bit more of programming involved, I still think it will allow for optimal and easy execution of the stretching protocol - an evolution of the existing devices

Awesome! Please link to your log once you do. I think it’s just a handful of us with this approach at the moment and I think we’re at the helm of a PE revolution behind Kyrpa, Tutt and fdersby being the first one to implement apart from Tutt. Pretty exciting times in the world of PE.

Originally Posted by dickwut
Hi, I see from your log that you have a phantom as well. How do you deal with the surface gap between the vacuum sleeve and shaft where the sleeve ends, too?

Btw, if I understand the picture you’re painting correctly, it might just be a matter of filling it with extra US gel.

Originally Posted by CBateman
amazing to see you back!
I am 100% committed to building your device.
I already spent a few hours witk Autodesk 360 and tried to create my own 3d model but it turned out subpar.
I am so excited for your new infos :-)

Awesome! Happy to hear you installed Autodesk! Will share more info possibly later today, or tomorrow.

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