There is an old phrase that 10lb = 1 horsepower.  I have never understood why 
the phrase wasn't quoted in lb/f and whether it should be 10lb = 1lb/f.  
Maybe someone knows/can find out?
In a message dated 19/12/01 13:51:21 Pacific Standard Time, 
guy@weller-lakes.freeserve.co.uk writes:
> Now, someone do the maths and work out the reduction in the rate of
> acceleration of Spidget and driver for every additional 25lbs!!
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