Originally Posted by Whirl Wind Propellers
330-2B 72H-72" weighs 40 lb standard ($12,400) and 44 lb counterweighted ($13,000)
330-3B 72H-73" weighs 53 lb standard ($14,355) and 60 lb counterweighted ($15,255)
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I understand "counterweighted" in this post to mean counterweighted prop blades for aerobatic operation.
Counterweighted (or dampened) crankshafts are a different thing altogether, yet also very important to propellors.
If I'm wrong, please let me know