Here is the current table of kg-cm cantilever force for tower HS and HSFs mounted in a tower chassis. The weight can be the specification or measured (m*) including K8 mounting hardware. The center of gravity is determined by suspending the HS by a wire or string until the mounting base is perfectly vertical. Once the CG is found, the distance from the base to the CG in cm is measured. Usually a right-angle heat pipe simplifies this but in the case of the Thermaltake Big Typhoon CG determination may be more difficult.
A 4.56kg-cm rating is equivalent to hanging a 456g HS on a wall - or mobo in a tower case - with a 10cm (4") lever arm. Smaller numbers are better.
4.56kg-cm Thermaltake Sonic Tower 691g(m*) 6.6cm, no fan
3.99kg-cm Scythe Ninja = 665g 6cm, no fan
3.94kg-cm Thermalright HR-01 525g 7.5cm, no fan
3.18kg-cm Zalman CNSP 9500 530g 6cm, with fan
3.12kg-cm Scythe Shogun 691g(m*) 5.4cm, no fan
2.79kg-cm Arctic Cooling Freezer 64 472g(m*) 5.9cm, with fan
1.58kg-cm Scythe NCU-2000 478g(m*) 3.3cm, no fan
Could some of you other readers add to this table? I'm really interested in the numbers for the Big Typhoon, but not interested enough to buy one!