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{{Bridge Models Buyers Guide}} =====Structures=====

...from any point a distance ''''x'''' from them can be expressed as '''Wx / 2'''. If the load is in the centre of the beam, as shown, the maximum '''B.M. ...of the original beam load '''''(W/2)'' x half the length of the beam ''(L/2)'''''. This can be expressed as '''Load x Span divided by 4''' as shown

* Look at large framework structures ''(e.g. [http://en.wikipedia.org/wiki/Truss_bridge truss bridges], [http:// * Link the triangles together to form pyramid like structures ''(e.g. either square or triangular)''.

...ipedia.org/wiki/Cross_bracing '''cross-bracing'''] and can be seen in some structures where steel wires are used or metal [http://en.wikipedia.org/wiki/Tie_rod ' ...gonal bracing''' and '''cross bracing''' are both used in full size bridge structures.

Some bridges have decks or whole structures which can move out of the way to let traffic pass under and these are calle | colspan=2|[http://en.wikipedia.org/wiki/Beam_bridge '''Beam Bridges'''] are the oldes

...that it has a '''[[Strength of Materials|U.T.S.]]''' of around 15N/mm² and has a '''[[Young's Modulus]]''' similar to [http://en.wikipedia.o {{Structures Buyers Guide (2)}}

...]]''' from 3mm thick sheet Balsa ''(e.g. U.T.S. should be around 15Nmm² - use this figure if in doubt or to check magnitude of test results)' ...a ''(e.g. assume a figure for '''[[Young's Modulus]]''' (E) of 4000Nmm² or determine by experiment by measuring the '''[[Beam Deflection|Defl

Parabolas can be drawn as the graph of '''y=x²''' but there are other ways of drawing a parabola which exploit its v ...parabola may be drawn by first constructing a rectangle and dividing into 2 as shown.

Designs have continued to evolve with 2 spar versions now more common. In the early 1970's, kite designer Ed Grauel ...sic method of construction is shown opposite. Experiment with Proportions, 2 or 3 Spars, Leading and Trailing Edge shapes, Vent designs and addition of

...ong'''] should also be on hand ''(e.g. for packing or solving a particular structures application)'' | Plain wooden spring type clothes pegs can be glued on to structures using '''[[Glues and Pastes|PVA]]''' to provide a good anchorage for bearin

...' is first struck [[Squareness|square on]] to thicken it inside the holes (2), then the head is formed by hammering over (3) ''(and may be formed finall ...ry higher loads than '''Csk.Hd. Rivets'''. They useful for sheet metalwork structures where the thickness of sheet precludes countersinking.

{{Packaging Designer Guide}} See '''[[Packaging Designer User Guide]]''' for further information.