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Glueing silnylon fabric versus sewing

May 08, 2021 — BarryK

I am planning to sew my own tent, and have purchased some very thin silnylon fabric for that purpose:

...yep, all the way from Slovenia, as couldn't source it in Australia. Remarkably, it only took a week, shipped by DHL.

This is 10D (denier) fabric, very thin, and coated both sides with silicone so also very slippery. Extremely difficult to sew, so when I watched this video on glueing silnylon, was most intrigued:

A snaphot from that video, showing trying to pull the glued pieces apart:


...he was unable to pull the two pieces apart.

In previous work with constructing solar water distillers, I determined that silicone sealant bonds very strongly to existing silicone sealant, so it looks promising bonding two silicone-coated fabrics together. This I had to try!

I also have a piece of ripstop nylon from Spotlight:

...doesn't say that it is coated with anything, so presume not.

The silicone adhesive that the author of that video used, is expensive, but in the comments there is another one mentioned, that is, a flowable silicone sealant, Permatex Windshield and Glass sealant 81730, which is available locally, from Repco. So bought a 42g tube of that.

Experimented with both fabrics, silnylon to silnylon, and silnylon to ripstop, left 24 hours, then did the pulling test. Here is a photo of the ripstop glued to the silnylon:


Yes, a very strong bond. HOWEVER, if I grab the two pieces separately, at the ends, then they can be very easily pulled apart.

What this means is that the strength is longitudinal only. Would "longitudinal" be the correct word? Anyway, if there is any weakness at the join, a tear can start and will rapidly spread.

I found that the ripstop teared off more easily.

I then repeated the experiment with Selleys acetic-cure 401 RTV silicone sealant, this stuff:

Did not thin it, just spread it fairly thinly, left for 24 hours.

Same thing, it tears apart quite easily. However, the silnylon to silnylon is a noticeably stronger bond (compared to the Permatex sealant), almost to the point where I might trust it to construct a tarp. But still, once a tear starts, the tent will fall apart in strong wind.

There is one area where I think glueing is a good idea, at tie-out reinforcements, as this guy does:

...the glueing could be done carefully so that there is no weak point where a tear could start.

So, conclusion is that I will still sew the tent, but consider glueing tie-outs.  

Tags: light

Run ScPup 21.04 in a container in EasyOS

May 08, 2021 — BarryK

Two days ago, I posted about running FossaPup in a container in EasyOS:

Now, ScPup has been converted to run in a container. This is another "official Puppy", built from woof-CE, with Slackware-current binary packages. Note that Slackware-current will eventually become Slackware version 15.0.

ScPup was created and is maintained by forum member 'peebee', who has a very long history of creating interesting pups. The one that I have "containerized" is the ROX-JWM build. He has another, LxPupSc, that has LXDE instead of ROX-JWM. Here is the forum section for ScPup:

It is the usual procedure: click on "sfsget" on the desktop, click the "puppy/slackware/15.0" radiobutton, download the ScPup SFS and install it, and you will have an icon on the desktop. Click the icon, and it flips to the ScPup desktop:


That ball with an "S" in it, couldn't find that as a standalone logo, and as wanted a logo for the desktop, grabbed this one:


...just needed an icon different from the other pups.

Took a while to take out entries from the menu that are not appropriate inside a container (in future, script 'dir2fs' will do that automatically). Briefly tested some apps: geany, abiword, gnumeric, browser OK. Sound OK. Feedback welcome here:   

Tags: easy

Test SLAR 5W 5V solar panel

May 07, 2021 — BarryK

Continuing the saga of testing these little photovoltaic solar panels, here is the previous test:

I came across one on Aliexpress that is sold with or without the USB 5V regulator, so I bought the one without:


It has a slightly thicker substrate than previous ones tested, so is more rigid. Weight is 90g. Brand name is "SLAR".

Today is Friday, May 7, 2021, and I setup the panel outside at 10.00am. Measured solar intensity at 810W/m2, ambient temperature 22 degC, blue sky, no clouds, slight breeze.

Got the measurements started at 10.15am, finished at 10.20am. Then again measured solar intensity, 820W/m2. The cell temperature, IR detector held about 50mm from surface, 46.5 degC.

Here is the plot:


The peak power point is about 4.8V @ 0.7A, which is 3.36W. Well well, this vendor is being honest, in contrast with other recent purchases. This is mid-morning on a winter day, sun low in the sky, so expect more power at midday, and in the summer.

That voltage-current curve has a very sharp knee, then rapid drop-off. This would indicate high quality cells.  

Tags: light

Aborted attempt to run FatDog in container

May 05, 2021 — BarryK

I converted FatDog64 version 811 to run in a container. Get a desktop, looks OK, tested a couple of apps, such as Geany and LibreOffice, OK.

However, SeaMonkey crashes at startup. Just running normal 'seamonkey', not 'seamonkey-spot', get this:

[476] ###!!! ABORT: u_init() failed: file /tmp/seamonkey-2.49.5/mozilla/xpcom/build/XPCOMInit.cpp, line 709
[476] ###!!! ABORT: u_init() failed: file /tmp/seamonkey-2.49.5/mozilla/xpcom/build/XPCOMInit.cpp, line 709
Segmentation fault

Have no idea what that error is. So abandoning running FatDog in a container.  

Tags: easy

EasyOS 2.7.3 detects SSD in HP14 laptop

May 05, 2021 — BarryK

Ramachandra reported that the SSD in his new HP14 laptop was not detect by EasyOS. This has a 11th Gen Intel i3 CPU, specs and discussion are here:

I compiled the 5.10.32 kernel with some configure changes, took a punt to see if they might fix the problem. Report on that compile here:

Just received an email from Ramachandra, informing that the SSD is now detected, running EasyOS 2.7.3. That is good news for anyone wanting to run Easy on these new laptops.  

Tags: easy

Run FossaPup 9.5 in a container in EasyOS

May 05, 2021 — BarryK

Yesterday I posted about converting Slacko Puppy 7.0 to run in a container:

Have now given the same treatment to FossaPup 9.5. Here is the FossaPup section in the Puppy Forum:

Running EasyOS, you can now run FossaPup in a container. Click on the "sfsget" icon on the desktop, choose the "puppy/ubuntu/focal" radiobutton, click on the FossaPup entry to select it, then click the "Download" button.

Click a couple more buttons, and you will have "fossapup" icon on the desktop. Click it to flip into FossaPup full desktop running in a container:


ALT-F6 to flip back to the main desktop. Click "fossapup" icon to flip back, or click on "fossapup" in the tray.

To share files between FossaPup and the EasyOS main desktop, place the files in /mnt/wkg/home/shared.

Please test, let me know if you discover any issues, at the EasyOS section of the forum:     

Tags: easy

EasyOS version 2.7.3 released

May 05, 2021 — BarryK

Yes, another! Release notes:


I recommend upgrading to 2.7.3, as has fixes for containers, such as for running Slacko.

Have fun!  

Tags: easy

Run Slacko 7.0 in a container in EasyOS

May 04, 2021 — BarryK

Today downloaded the Slacko 7.0 ISO, extracted the SFS file from it and converted the SFS to EasyOS-compatible format. The steps are described here:

If you are running EasyOS, click on the "sfsget" icon on the desktop, click the "puppy/slackware/14.2" radiobutton, and you will be able to download the Slacko 7.0 SFS file, and install it as a container.

The steps are very simple, and you will then have a new icon on the desktop, labelled "slacko". Click on that, and the screen will flip to the Slacko desktop:


I did some basic testing. Browser works, with Internet access. ALT-F6 flips back to the main desktop.

Slacko is locked inside a container, and cannot see the drives, but you can still share files with the "outside world", via a shared folder /mnt/wkg/home/shared. Files can be passed either way.

Ah, what about audio? Right now, clicked "slacko" icon to flip back to the Slacko desktop (or could have clicked on "slacko" in the tray), ran "aplay /usr/share/audio/" -- yes, works! ALT-F6 flips me back here.

Not much more to say, it just works!   

Tags: easy