Glow vs. electric motor equivalency

I' m sort of starting over in modeling. My last experiences
were in the late 1950s when control line models were
finished with dope and silkspan, Ambroid was the best glue,
and control line flying was king (only a few "older" folks
with real $ could afford RC). Needless to say, CA glues,
monocoat, foam, and electric power are all new to me. BTW,
this group has been great about answering my "newbie"
questions!

I am still confused about electric motor sizes. A brushed
400 motor is nothing like a 400 in a brushless design. I
thought that motor dimensions could serve as a rough way to
compare one brushless motor to another, but when you throw
in "turns", voltage, etc. this falls apart. No one speaks
about glow engine equivalency, yet this is something that
would make sense to someone who grew up with glow engines as
I did.

Here is my question......
746 watts is equal to 1 hp. Many brushless motors give
watts as a rating (if not, it can be calculated by
multiplying volts times amps), so I should be able to
calculate the hp for a given brushless motor, shouldn't I?
If I then looked up with the hp ratings for glow engines of
various sizes (I could use non-ringed OS motors as generics)
I could make a table comparing the wattage of brushless
motors to their glow equivalent.

Will this be valid? Am I missing something? Is there a
better way to judge the power of brushless motors?


.

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