Elliot Apatov teacher
been teaching bridge-building and crane-building to middle and high school students in the Portland metro area since 1995.
The kids and I have built everything from small
I've used this crane with many middle school classes.
BRIDGE BEAMS started out as a toy for my niece's son Jake.
Then I decided to improve on the design.
I used lengths of wood (alder),
3/4" thick, 1 1/2" wide, cut to different lengths
I drilled holes every 4", so I could use 3/8" dowels to connect the "beams".
Now you can stack and arrange the beams however you like to build-
a zip line, a catapult.
Once you add pulleys, a lazy susan, wheels and a
windlass, you can design and build almost anything.
The crane- the boom angle can change, and the whole crane swivels, - is loading a #3 beam onto the truck
see BRIDGE BEAMS