Wingtip props mean if one fails, you MUST turnoff the other and rely only on the tail pusher.
It depends on the altitude of emergency onset but with just the tail it's likely the ONLY goal would then be to set down somewhere safe immediately.
Do electric planes have some future?
Yes, I think so.
I agree that electric airplanes might have a future but have a hard time believing the battery technology exists. At least not hauling one ton the distance of 650 miles. Curious if other Freepers might have an insight.
Propellers are only suitable for use at subsonic airspeeds mostly below about 480 mph (770 km/h; 420 kn), as above this speed the blade tip speed approaches the speed of sound and local supersonic flow causes high drag, noise and propeller structural problems.