This Activity is meant for Boy Scouts.
Decide for yourself if it is appropriate for your younger scouts or not.

Per patrol:
3 staffs or poles, about 6 feet long
3 poles, about 4 feet long
7 pieces of rope or cord, 10 feet long
20 feet of twine
1 #10 size can
1 1/2inch metal nut

Create a 'Reactor Bell' for each patrol:
Punch a hole in the bottom of the can.
Run the twine through the hole and tie a knot, leaving about 1 foot of twine in the can.
To the end of this twine, tie the nut so it swings inside the can like the clapper of a bell.

Good for lashings, leadership, teamwork.
Can be done as a single patrol or a troop competition.

Goal: Transport a radioactive reactor core to a safe disposal site using your self-made transporter.

Each patrol uses their materials to construct a tripod pyramid by lashing the poles together.
The reactor is hung by the twine from the top of the pyramid so it hangs freely.
The transporter is moved to the 'safe zone' - the finish line about 100 feet away.
If the reactor bell sounds, there was too much jarring and the patrol must return to the starting line to begin the transport again.

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Lashings to use would be a Tripod Lashing for the 3 long poles and then Square Lashing to bind each end of the short poles to a tripod leg. The structure would then be self-standing and scouts could lift the short pole cross braces.