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<<  The "big guys" (commercials)
have used all-electric, with multiple electric power backups all along. >>

Bill:  Not all the "Big Boys" use a miriad of reduntant multiple backup electrical systems.  In fact all the commuter aircraft I flew used a vacuum driven backup horizon and DG which was powered off of suction from the engine.  The worlds largest cargo airplane I flew also had vacuum backup.  We don't all have the ability or $$$$$$ to install backups to the backups and carry around useless weight disguised as emergency batteries, when a simple vacuum pump works quite well with limitations, and has for years, including since the 30's.

Mike

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