Pratt Truss Bridge
Pratt Truss Bridge
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 NMS05 Precision Brass Artwork HO 1929 166 Pratt Truss Bridge Weathered  US $699.95
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 BRASS PBA 162ft PIN CONNECTED PRATT TRUSS BRIDGE F P SILVER NEW US $695.95
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 BRASS 162ft PIN CONNECTED PRATT TRUSS BRIDGE F P BLACK US $695.95
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 NMS03 Precision Brass Artwork HO 1929 166 Pratt Truss Bridge w Walkways US $669.95
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 BRASS PBA 162ft PIN CONNECTED PRATT TRUSS BRIDGE F P RED US $599.95
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 NMS01 BRASS 162ft Pin Connect Pratt Truss Bridge UNPAINTED BRASS NIB US $588.00
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 BRASS 162ft PIN CONNECTED PRATT TRUSS BRIDGE UNPAINTED US $495.95
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 SINGLE TRACK RAILROAD PRATT TYPE TRUSS BRIDGE 20 inch KIT HO Scale US $49.95
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 SINGLE TRACK RAILROAD PRATT STYLE TRUSS BRIDGE 150 Scale foot KIT HO Scale US $39.95
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 Central Valley 1902 150 Pratt Truss Bridge US $36.31
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 BRIDGE ABUTMENTS CENTRAL VALLEY 150 PRATT TRUSS STEEL BRIDGE KIT HOn3 HO NEW US $31.89
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 Pratt Truss Bridge 150 Foot HO scale 150 US $40.00
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Building a balsa wood bridge...best design?
what is the best design for balsa wood bridges? pratt truss? warren truss? please include links/ images. also any personal experience with building these would be helpful 
thanks
i don't want a video...something that i can print out.
A Warren truss gives more strength for less parts. It has more "triangles" than the Pratt truss. (see first answer). The Pratt has many verticle members. Without boring you with the math, basically triangles are stronger. (hmmm..... maybe you aren't bored with the math. That makes you one of us. Sorry)