In article ,
(Jay Masino) wrote:

Jay Honeck wrote:
This whole topic drives me crazy, since the idea of a "vacuum system" is
ridiculous in the first place.
I'm stuck with one, and have replaced both of my vacuum instruments in the
last six months. Why? Because the danged electric replacements are
absurdly over-priced, and the back-up battery that would make an
all-electric system prudent (and legal) is even worse.
Personally, I think the fact that we're flying around behind vacuum
instruments in the 21st century is patently absurd.

I suspect it's a lot easier to get a gyro to spin at 10 or 15,000 RPM (or
whatever) using vanes and vaccum, than it is to design a reliable electric
motor to spin the gyro at that speed.

It's easy to build an electric motor which spins a disk at 10,000 RPM.
It doesn't cost much either... http://shop4.outpost.com/product/3120560/