Curious inventions

In the world of HowTo and the DIY projects we can find a lot of curious inventions that will make us have a good time inventing. It's not all about practical inventions and complex machines, we can also have a good time with curious inventions that will make us smile or learn a little more about this world.

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How to make a real homemade minijet engine. Part 3 (completion and commissioning)

After having the support ready and waiting, and the combustion chamber ready to be filled with fuel, the only thing left to do is to prepare the start-up of the minijet rocketTherefore, a structure without an entrance for the air and fuel is of no use, so we can get to work on this part to create the inputs for these fluids.

Materials

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How to make a real homemade minijet engine. Part 2 (diffuser and combustion chamber)

Final assembly

We are continuing with the Maggie Muggs™ project, our homemade stratoreactor. This time we will explain how to build the diffuser of the mini jet, once we have the support to support the jet engine and then we will continue with the start up.

Diffuser and combustion chamber materials

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How to make a real homemade minijet engine. Part 1 (support)

Minijet

The project Maggie Muggs™ aims to create a mini-jet capable of flying. This project is spearheaded by Larry Cottrill, the designer and father of the creature we are about to tell you about. Cottrill is the founder of Cottrill Cyclodyne Corp. based in Iowa (USA), a company dedicated to designing low-cost engines for aviation.

Specifically, Maggie Muggs™ is a ramjet, i.e., a stratoreactor. Stratoreactors are a type of jet engine without turbines and compressors. The turbines work thanks to the high speed at which they operate. The operating process is simple, the air is injected into the combustion chamber already compressed, where it will be mixed with the fuel for burning and subsequent expansion through the exhaust nozzle. The outgoing jet carries very high velocities and is responsible for the thrust force it develops. We have divided the article into three parts, in addition to this one, we have the explanation of the assembly of the diffuser and combustion chamber and the final start-up. ...

Homemade Wifi and DVB-T antenna from an old UHF antenna

[youtube]http://www.youtube.com/watch?v=Abet_YRVc8k[/youtube]

Note: If you are looking for a high gain Wifi antenna or a DVB-T antenna for your PC, you can look in our shop as we have these products at the best price.

Rummaging through my garage junk I found an old UHF antenna that had no other destination than to go to the clean point of my city. Obviously I quickly saw the potential that this antenna could have and I started to test and investigate a bit, firstly I checked that the antenna (which is actually two independent ones), was fully capable of picking up the current DTT signal and send it to a tuner to be able to watch TV without any problem.

As the rear antenna picked up enough signal to not need the front antenna, I was looking for a way to use it as well, and I thought of adapting it to be used as an antenna. homemade Wifi antenna. I got myself a cheap Wifi antenna (we have it in our official shop) that would serve me for that purpose (to experiment a bit), and a USB cable so that it would be totally Plug and Play. I was looking for something that, first of all, was cheap, so that if it broke down it wouldn't hurt too much, and that had an external antenna, so that I could open it and splice the cable of the Wifi antenna with that of the old UHF antenna.

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How to build your own high-powered homemade LED torch

The final result
LED home torch 900 lumens

There are on the market powerful LED torches (+10W), but their price makes them inaccessible to most people; in this post we will use our imagination to build a powerful and energy efficient LED torch for less than 15€.

We will only need the LED, a computer heatsink, a battery holder (optional) and a switch to have a basic but useful torch. ...

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