2009-11-14

Slobo - the lightweight DIY stove


A Do It Yourself (DIY) stove, which is easy to make, extremly light (22 gram, without fuel) and extremely slow.

With a small t-light (standard) the boil time is approximately 100min for 0.25 litres of water, starting at 23C. With a t-light that fits snuggly in to the stove, the boil time is reduced to respectable 60 min. Slow boil!

Construction: the pictures speak for themself. Cut a can to get the heating unit and a lid. The heating unit should have a few holes in it to enable air circulation. Four cuts in the top of the heating unit allows for air and stability for the can.

The good things with Slobo are:
-Price, which is close to nothing.
-Easy to make.
-You will improve your patience.
-You can almost always build one.
-It is a good reason to bring beer on a hiking trip (emergency stove!)

Main drawback, after accepting that not everything in the world should be super-jetboil-fast, is that the construction is a bit fragile and not so stable. But you can probably mend it if you buckle it and it is not difficult to come up with ideas to make it more stable.

Ideal use:
-Blackouts
-Hunting (you´ll spend a few hours at the same spot)
-Ultra light backpacking, 22 gram < 1 oz, holy ****!!

Improvements:
-By adding insulation to the can you may reduce the boil time down to 40 min (with the big light), according to preliminary calculations.
- By cutting up two or maybe three small t-lights and putting them into the stove the boil time can be reduced significantly, the drawback is that you might get an aggresive fire in the stove, when the temprature reaches 400C all the paraffin will ignite. DANGEROUS.
-Extra-duty-combat-version may be developed using tin cans.

The small t-light is good for boiling a little more than 2 times, the big one boils 0.25 liters 10 times.

Caution:
The can may reach 100C (kind of the intention).
Paraffin is dangerous when heated.

2009-11-03

Turn the mobile phone upside down

Mobile phones are no ergonomic wonders. But one easy thing that could be done is to turn the layout 180 degrees, i.e. buttons on top and screen below (especially for "candy bar phones"). If you hold the phone in the traditional way you have something like 1-2 cm to hold on to... if you rotate it you get a really steady grip and probably reduce the risk of "sms-thumb". Honestly try it! You might think that the thumb will cover the screen, but that's not the case. One thing that might happen is that the thumb provides some shade, making it easier to use the phone outdoors...

I know that this post is a bit late... only troglodytes use candy bar phones these days and they are a bit conservative... so the market potential for this idea is low, but anyway, just needed to point it out (old idea). Anyway the concept might be applicable for other phone designs as well (phones with qwerty keyboard?).

Customer base: 1 (troglodytes)
Implementation: 5 (extremely easy)
Potential: 5