Originally Posted by
mechpowi
If there is no N1-gearbox, then all oil and fuel pumps must be electric, right? I wonder how much redundancy Hill is planing to engineer in the system to achieve comparable reliability to conventional systems that have mechanical driven primary pumps and possibly additional mechanical or electric driven auxiliary pumps?
As I recall the oil and fuel engine pumps have double-wound motors with separate power sources. So they are internally redundant. But that is dated info so I don't know if that was the final design. I believe the other reason they went to electric pumps was to configure their locations without the limitations of an external drive requirement.