Gakken Stirling engine Assemble And Operating Instructions - Page 12

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35
35
Figure ー
After the
The end of the engine
experiment.
has remaining heat
after the experiment.
Make sure it
becomes cold
enough before you
put it away.
Warning ★ Fire is used for the experiment. Use great caution to avoid
a burn and fire. Do not let a 15 or less-year-old child experiment alone.
★ Caution with Fire and Heat ★
・ Do not leave the engine while the lamp is lit or heat remains.
・ Do not hold the body or the stand when the lamp is lit. It is very dangerous
　if the alcohol spill.
・ Do not put the stand on a slippery surface when making an experiment, or it may move.
・ Use great caution with small children when making the car experiment together.
・ Use great caution with remaining heat after the experiment.
・ Remove alcohol from the alcohol tray after the experiment when not using
for a long time.
・ Use great caution to keep alcohol fuel after the experiment. Keep children away
from the fuel and the machine.
Ｑ ： The displacer doesn't move even with batteries.
A1. Are the batteries new? Are the positive and negative terminals on the batteries facing the right way?
Are the motor and the batteries connected firmly?
A2. Have you adjusted the heights of the piston with a gauge accurately?
A3. Isn't the gear idling? (Ensure the lever 3 is turned on.)
Ｑ ： The displacer moves with batteries but doesn't move with the alcohol lamp.
A1. Do the displacer adjuster (the black rubber tube at the E5 connecting rod) and the metallic part at the
end of the displacer move in the same rhythm? (If they don't, see p.15 and adjust the length of the shaft
of the displacer.)
A2. Does the wick of the alcohol lamp come out enough? (Check with the diagram at p.18)
Ｑ ： The fan experiment doesn't go well.
A. Doesn't the nut at lever 2 loosen and the gear become out of mesh? (Tighten the nut of the lever 2.)
Ｑ ： The engine becomes slow after several times of experiments.
A. Dust may be produced by the friction wear of the metallic end. Remove the glass cylinder and clean out the dust.
※Caution!
 This part remains hot.
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Attaching Non-Slip Cover to the Four Corners of the Stand
How do Stirling Engines work?
Set four non-slip covers (See the diagram.)
The following is the
to the four corners of the stand.
mechanism of Stirling
engines.
①
①The thermal
non-slip cover
expansion of air
pushes the piston to
the gear side.
non-slip cover

Making Your Own Displacer

You can make your own displacer using the shaft of the displacer in the kit. In case you make one, follow the instructions
below. (It is not necessary to make one if the kit moves well in the first place. Try when the original one crumbles, or the
metallic part has come off, or you really want to try.)
Things you need
②When the piston
②
reaches to the gear
side, the hot air is
shaft of the displacer
pushed to the cold
side and get cold.
scissors
news
papers
①Cut the steel wool
 in half.
③
③The contraction of
air brings the piston
②Spread the steel wool as this diagram.
back to the hot side.
③Cut it in 1/3 and 2/3.
④Put the 1/3 around the shaft to form a core.
④
④Cool air is pushed
by the piston to the
hot side and
expands.
(Return to ①)
⑤Wrap it tight.
It looks like this so far.
gear
cold side
displacer
non-slip cover
non-slip cover
A1
stand
piston
steel wool
small board
(A small book can
be used as a substitute.)
mask
※Please wear a mask since metallic dust floats in the air.
⑥Wrap what is left around the core.
 Wrap the first half tight and the second half
 a little looser.
⑦Neaten the shape of the rolled steel wool with a board.
 Move it back and force in the glass cylinder to check the shape
 at times.
※Check if it moves
 smoothly.
glass cylinder
⑧After neatening it, cut it in the length shown in the diagram below.
 (Pay attention not to cut the shaft. Cut both ends.)
 Press it in the glass cylinder to fix the shape.
about15cm
about 6cm
23
hot
side