Rocketstove: Making one from metal Olive oil container

For the last few months I have have comments turned off. There was a lot to say and I didn’t want distraction. But don’t think that meant I wasn’t listening to you. I pay attention to what people read and what search terms lead them here.

Rocket stoves have been a popular search item so its time to give you even more information.

I’m going to make one. I’m starting with a 13kg Olive oil can and I’ll have photos for all the relevant steps and a boil time test.

13 Kg olive oil can.  31 pounds in weight

The starting material a large Olive oil can. restaurants and other food businesses throw these away quite regularly, so that’s a good place to start looking if you don’t usually buy oil in this size container.

It’s convenient that there is a large round hole in the center of the top so I wont need to cut one there. Somewhere in the purple band is where I will cut a hole for the pipe which will be the elbow bend pipe.

There is a small handle on the front which i will probably keep as it will be useful for carrying the stove if I need to move it. i think the handle will be better at the front rather than the back as it will stop the ashes falling out for the bottom of the elbow.


The next step will be using sand paper to remove the paint from the can. If the paint is left on the can, it will burn and produce unpleasant and possibly toxic fumes.


<more to come>

Scrambag: folding pruning saw

Apart from the obvious intended use of pruning trees, the compact folding pruning saw allows you to collect small branches easily.

A saw is safer to use that a axe or heavy knife in cutting wood. One of the most common sources of dry wood in a forest is dead-fall.

Dead-fall is dead or broken branches fallen to the ground, and are often very dry and difficult to cut will axes as the will act like a spring when hit.

Sometimes dead-fall is a branch upside down and very dry, because of this it makes excellent fire wood or construction material.

The saw can elegantly cut of the exact pieces you want and even help you create items form the wood with precise cut lengths and flat ends of wood.

The saw is also very light compared to a small axe and very small, about the size of a small axe handle.

Folding pruning saw, compact and allows straight cuts in wood with little effort.


Price about $10 for average quality.

Available from hardware stores and gardening supply stores.

Fire: Swedish fire torch

This is a really neat technique of conserving wood and getting a fire going fast and making a stable cooking platform. You will need an axe and a saw to shape the wood block, but it looks worth it.

I just had another thought, all the things are familiar but arranged in a different way and its suddenly so much better, what a concept.

Comments are now enabled

Now that all the readers have had enough time to see the tone and style of the posts here, I am accepting comments.

By making a comment there is no guarantee that it will be published, but nothing relevant, reasonable and well written will be refused.

Of course I reserve the right to add conditions for veto on a  case by case basis, as different eventualities arise.

So aside from the above , I’d like to hear what you have to contribute.

The comment button is not obvious because of the theme, if there are no current comments.

This should help you find it in relation to the post title and the grey line.

How to find the elusive comment button.

Navigation: Distance in miles and nautical miles

For almost everything else the Metric system is the best system to use, it’s widely used in the world like the way English is understood.

The Metric system is extensively integrated into science and engineering.

However in Navigation based on extremely old standards (people have been making maps for as long as there have been kings) inherited from the Sumerian civilization.

When we talk about degrees° minutes’ and seconds”  they are commonly refereed to as degrees of an arc, minutes of an arc or seconds of an arc.

The basic idea is that 1 minute (of an arc) is 1 nautical mile.

1 minute of an arc = 1 nautical mile = 6076 feet = 1.15 statute miles  = 1.852 kilometers

1 second of an arc is therefore 101.2666 feet  = 101 + 4/15  feet =  101 feet 3.2 inches = 30.866 meters

Note the current standard American nautical mile is 6080.2 feet.

So because these standards are locked together an have huge historical legacy it worth learning them.

The idea that 1 minute of an arc is 1 nautical mile helps bring real world scale to something as abstract as 1/60 of 1 degree on a compass.

Calculation to show diameter of earth

Based on 180 degrees pole to pole : 1 minute of and arc  X 60  X 360 X nautical mile = circumference of earth

1* 60 * 360 = 21,600 nautical miles

circumference = π * D

circumference / π  =diameter of earth in nautical miles

21,600/ 3.14157 = 6875. 54 nautical miles

In kilometers:

6875.54 *1.852 km    =   12,733.5 km

accepted value, average earth diameter : 12,742 km

99.93% of the modern accepted value.

For example if you found a pirate treasure map, you can be sure its is distances are measured in nautical miles. Sadly even nautical miles had local variants due to local variants in what was a mile. Nautical mile are also 1% shorter at the poles as the earth is an oblate sphere ( a sphere with smaller diameter at the poles).