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We don t want to have to keep replacing our water in order to keep the bird working. Now is the fun part, if you are of a destructive disposition. We are going to take all of the little accoutrements away from this beasty! Boil a kettle and get some hot water, you will find it softens the glue and makes it a lot easier to remove things. Remember, the glass is only thin and easy to break. Pull the hat of the bird. The hat usually disguises a little glass protrusion on the top of the bulb (Figures 12-3 and 12-4), so do this carefully, if you break the envelope of the bird it stops working. Also, the little tail feather is going to need to go. Next you are going to have to remove the felt and
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Figure 12-4 The hacked drinking bird with it's fresh new paint scheme.
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next to it! So, get some spray paint the type used for touching in dents on cars works well and spray the bottom bulb black and the top one silver. Remember the evaporation of water cooling the head of the bird. Well, instead, reflective silver paint is going to keep the head cool. The black
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base of the bird is going to heat up as it absorbs solar radiation. Now position the solar engine back on the legs of the bird, and put it somewhere where it will receive a lot of sunlight. You should now see the engine tipping away without the need for any water!
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Project 31: Make a Radial Solar Can Engine
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Project 31: Make a Radial Solar Can Engine
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result of the black covering absorbing the sun s rays. This increase in temperature results in the air inside the can expanding slightly. This increase in volume exerts a force on the rubber diaphragm covering the can. The diaphragm is connected to a short rod, which pushes against the crank turning the can assembly. When the can has rotated far enough so that it is covered by the polystyrene shade, then the sun s rays can no longer reach the can. As a result, the air inside the can begins to cool down. As the air cools, it contracts, in doing so, it pulls the rubber diaphragm (Figures 12-5 to 12-12).
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You will need
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Polystyrene ceiling tile or sheet polystyrene Three old cans Stiff wire (coat hanger wire is ideal) Three balloons Wooden strut
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Tools
Tin opener Scissors Wire snips
You might remember the biplane engines of old they had their pistons arranged around a centrally driven shaft the prop shaft which would turn the propeller. This is known as a radial engine. In our cars, the pistons are generally arranged in a straight line or sometimes a V, radial engines are different in this respect. In this project, we will be building a radial engine, only rather than being fueled by aviation fuel, our engine is powered by the sun!
How does the solar radial engine work
The cans that are exposed to the sun (i.e. not covered by the polystyrene shield) heat up as a
Figure 12-5 Solar radial can engine.
Project 31: Make a Radial Solar Can Engine
Figure 12-6 The polystyrene shade.
Figure 12-9 The can assembly on its stand (from above).
Figure 12-7 The view from behind the can engine.
Figure 12-8 The can assembly (note the crank detail!).
Figure 12-10 The can assembly on its stand (from the side).
Project 31: Make a Radial Solar Can Engine
Figure 12-12 Diagram of the radial can engine.
Figure 12-11 Note carefully how the crank is configured.
13
Solar Electrical Projects
In this chapter, we cover a number of small electronic projects you can build that are powered by solar energy. The chapter aims to show you how many common household devices that we take for granted could potentially run successfully on solar energy.
Project 32: Build Your Own Solar Battery Charger
You will need
AA battery holder 9 V battery clip (you might need this to connect to your battery holder) 8 solar cells 0.5V, 20 to 50 mA in full sun 1N5818 Schottky diode
This circuit is a very simple design which doesn t provide any regulation, so you will need to make sure that you disconnect your batteries when they are recharged. The Schottky diode prevents the batteries charge from flowing back through the solar cells when no charge is present. Schottky diodes have the advantage of not sapping too much of the power from our solar cells maximizing the amount that is delivered to the batteries. The schematic for the battery charger is shown in Figure 13-2.
Rechargeable batteries make good economic and environmental sense. In the same way that you wouldn t throw away the glass every time you had a drink, so it doesn t make sense to dispose of batteries when others are available that perform the same task many times over. It gets even better than that when you realize that you don t have to use any mains electricity at all to recharge your batteries you can use the power of the sun! Solar battery chargers like this model are commercially available, which can be obtained from the Centre for Alternative Technology, U.K. (see Supplier s Index) (Figure 13-1); however, if you are electronically minded you can easily put one together. The circuit here will recharge a pair of AA batteries quite happily when left in the sun.
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