Old Channel Properties Old Channel Properties diverseengineer (Civil/Environmental) (OP) 25 Apr 12 09:50 I am looking for section properties on what is being called out as a channel (" [7x3.5 BSC-10 20.3# ") on a set of lattice tower plans. The plans are dated 1958. Thanks for your efforts in advance. RE: Old Channel Properties MiketheEngineer (Structural) 25 Apr 12 13:02 Google??I can't find it RE: Old Channel Properties VTEng99 (Structural) 26 Apr 12 11:52 according to an old carnegie steel manual i have that's a british standard section ship building channel. from the designation you can probably figure out that it's 7" deep with a 3.5" wide flange and weighs 20.3 plf. other properties are:area of section = 5.9 in^2web thickness = 0.400 instrong axis I = 44.2 in^4, r = 2.74 in, s = 12.6 in^3weak axis I = 6.7 in^4, r = 1.07 in, s = 2.8 in^3, y = 1.09 inhope that helps.