Dumas Products Inc

[TuptubBuilder]

No system is perfect and I accept my partial complicity by embracing the digital world. I just maintain that the losses exceed the benefits, especially...

[TuptubBuilder]

Amazon is the real culprit, IMHO. All the local Hobby Stores were forced to close. No more hand crafted models displayed in store windows. No more model...

[TuptubBuilder]

From what I gather, it's due to a lack of sales. Their boat hardware was on the expensive side. The email stated that: "Dumas is closing. But we...

[TuptubBuilder]

As of May 15th, Dumas Products will be no more. No more wooden boat kits. No more balsa plane kits....

[TuptubBuilder]

Just a few comments about Frsky. I own an X18S Tx and just updated the firmware to 1.6.4 with no problems. However, my attempts to update the firmware...

[TuptubBuilder]

As long as you launch when surfaced I think you will get satisfactory results. A soda vinegar reaction can't compete with CO2 cartridges or rocket motors...

[TuptubBuilder]

You mean like this
...

[TuptubBuilder]

I don't want to hijack your thread but pumps are a real sticking point when it comes to this hobby (IMHO). It may be worth discussing at a Dive Tribe...

[TuptubBuilder]

A while back I built a crude rotary vane pump. It seemed to work quite well. A nice feature is that the vanes are the major wear item and are easily and...

[TuptubBuilder]

Thank you for your comments. I was inspired by the Jam Jar RC sub as seen on Essential RC's You Tube channel. It's ugly too. ...

[TuptubBuilder]

The LEGO Generation may find this interesting. I refitted an Arkmodet WTC and wanted to test it before committing it to a Boat. It's a skin on frame design....

[TuptubBuilder]

I looked for an "al in one" flight controller for a micro quadcopter to fit the bill. It has stability control and ESC built in. The only problem...

[TuptubBuilder]

Even better image ...

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Better image ...

[TuptubBuilder]

I probably should have posted this version first. This first attempt was without the launch lock and check valve. I also had to fix all the torpedo leaks....

[TuptubBuilder]

My first attempt was to slip fit the brass tube nozzle to an O Ring and let the pressure launch the torpedo. This arrangement did not allow enough pressure...

[TuptubBuilder]

DISCLAIMER: Chemically propelled projectiles are inherently dangerous. The following is for educational and or entertainment purposes, any attempt to...