whats a good design for a mini balsa wood bridge? it has to hold 100 pounds!?

must have:

mass- 45.0 grams or less
length- must be longer than 38.0 centimeters (2.0 cm by 2.0 cm square rod must be able to pass through full length of roadway surface)
height & depth- can't extend more than 12.0 cm above test support surface and 10.0 cm below it.
roadway- will support 100lbs load, cannot be more than 2.0 cm above test support surface

BRIDGES CAN'T BE WEDGED INTO SUPPORTS)

someone please help, i'm stuck!

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lemonie6 years ago

Homework question yes?
Listen: this is a classic school project, millions of kids have done it / similar. Go looking for the same.
http://images.google.co.uk/images?hl=en&source=hp&biw=1408&bih=883&q=balsa+wood+bridge&gbv=2&aq=6&aqi=g10&aql=&oq=balsa

L



+1.
frollard6 years ago
triangles.
Tetrahedrons - there's no requirement in the spec for traffic to be able to actually cross the bridge.
no, just the hollow passage - no 'deck' required per se. tetrahedrons for the win.