January Cub Scout Roundtable Issue
Volume 7, Issue 6
Passports to Other Lands
Webelos Scholar & Engineer
Tiger Big Ideas 10 & 11
Heart of America Council
Almost every boy, not to
mention most adults, can find an interesting area of engineering.
An engineer applies the laws of physics and chemistry to solve the
problems of construction, industry, and other areas.
The scientists who build machines are called engineers.
They do tests and experiments that help them to invent new machines
or improve old ones.
Visit a construction site.
Have an engineer or surveyor visit your den meeting.
Demonstrate the basic principles of leverage by using a teeter-totter or a
plank with a fulcrum made of bricks or blocks.
Draw a sketch of a bridge to build.
Do-it Yourself Flashlight
This flashlight can be
assembled easily and provide a fun project for the boys.
And better yet, it actually works!
Plastic pill bottle with a flexible lid
1. The pill bottle should
be large enough for the battery and bulb base to fit inside it.
The wire should be the kind that can be bent easily.
Scrape the insulation from one end of your wire and form it into a
2. Attach the coil to the
bottom of the battery with adhesive tape.
3. Cut an opening in the
center of the pill bottle lid, so that the base of the bulb will fit.
Push base of bulb through hole in lid.
4. Scrape the other end of
the wire and wind it around the base of the bulb.
Secure in place with some tape.
5. Crumple small pieces of
paper. Place enough of this in
the bottom of bottle so that when battery is inserted and the lid is tightly
in place, the bottom of the bulb will just make contact with the raised
center top of the battery.
6. Hinge one side of the
lid to the bottle with tape.
7. When lid is closed, the
bulb will light. To shut off
your flashlight, flip the lid up. This
light creates a dim glow. If
you want a larger light, use two batteries in a larger container.
The Ringer is a successful
flying machine even though it is without wings, a tail or stabilizer.
Construct and test this unique flying structure.
1 sheet of paper
1. Cut two paper strips: 5
in x 1/2 in and 7 in x 3/4 in.
2. Tape the ends of the
paper to form two loops.
3. Tape the loops to the
ends of the straw.
4. Conduct test flights of
5. Make a variety of
alterations to the aircraft, such as changing the size of the loop, the
length of the straw, etc.
6. Record the length of
flight, direction of flight, etc. for each design variation.
7. Determine the best
design for accurate, long distance flight.
Build A Rocket Engine From A Chicken Egg
This engine works by the
same principle as the engines of future starships.
Its jet of steam allows it to propel a simple boat.
An uncracked raw chickenís egg
A fine knitting needle
All purpose glue
A metal foil food container (such
as TV dinners come in)
A paper clip
A few inches of stiff wire
Wash the outside of the egg
and pierce a tiny hole through it from end to end, using the knitting
needle. Hold the egg over a
basin and blow through one of the holes.
The yolk and white of the egg will come out of the hole at the other
end of the shell and fall into the basin.
Hold the eggshell under water and remove it when it is about half
full. Put your fingers over the
holes and shake it to clean the inside.
Blow out the contents, then rinse the eggshell again in the same way.
Now dry the outside of the shell and seal one of the holes with a
blob of thick glue, leave the glue to set.
Make the boat from the metal food container.
Trim the sides with scissors and bend one end to form the boatís
curved bow. Clip a small flap
of scrap foil to the stern of the boat to act as a rudder.
Bend the piece of wire to form a cradle for the eggshell. Cut a small
piece from the top of the candle. Hold
the shell under water so that a little water enters.
Do not let too much in as it will take a long time to boil.
Using hand hot water will speed things up.
Arrange the candle stump, wire frame, and shell as shown and light
the candle with an adultís help. After
a few minutes the boat will move forward, driven by the thrust of the
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that Baloo's Bugle and the original contributors are cited as the source of the material.
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