> To summarize the current thought :

Largely, but ...

> -- SP thinks hydraulics would provide best P/W ratio

if you exclude gas generator driven motors aka turbines, - which are
well known, immensely energy dense, but rather "niche" in application.

> -- Electric Motor afficiandos
> =A0 =A0 =A0SP says power would be a function of Ampere turns. =A0 This is
> what I thought as well.

Which is true as far as it goes but is a reflection that power
available is a function of power in and more amps require more volts
for a given number of turns, and more turns require more volts for a
given number of amps, so power tends to be is related to V^2, (which
is likely to no great surprise ... . )

> SP also says Neodymium permanent magnets are
> used in high performance motors for model aircraft. =A0This is my belief
> as well.

Which is true, but if ultimate power density is a requirement then
neodymium has an upper limit, whereas wound coils and other materials
MAY give higher flux densities.

High performance models do care somewhat about efficiency and mass
density of the energy source, which were implicitly and explicitly
excluded as considerations by the original s[pec.

> Gus =3D=3D> =A0So at the extreme, one might dump massive amounts of coola=
nt
> on the motor, crank up the voltage to force more current flow and get
> the lowest resistance wire. =A0Silver is only slightly better than
> copper and ( I was surprised ) gold is worse than silver or copper.

Sounds good.

-- =

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