[DrRobert]

I don't think its a make believe math b/c universal motors are rated differently. It's more of a "potential HP".

2. Horsepower — Motor horsepower ratings for hand held power tools usually
indicate the maximum power a particular motor design is capable of generating.
This does not mean that a 2 HP circular saw could be loaded to 2 HP all day long
and continue to perform without failure. What this means is that when loaded
under laboratory conditions for a short time (prior to the motor heating up), this
motor can generate enough torque at a high enough RPM to equal 2 HP (see
equation #I*). If a motor were to continue to be operated at this peak HP load, it
would shortly burn out due to the significantly higher currents than designed for
moving though the system. The typical universal motor will operate during normal
operation at 40-70% of the peak horsepower value.
A user can compare horsepower ratings to determine which tool may have a
stronger motor but keep in mind, the tool gearing will also have an effect on the
actual "Reserve Power" available.

*Equation #1: HP = Torque (lb. -ft.) X RPM 5250

Source:Routerforums.com