Discussion in 'Electric Propulsion' started by saini flyer, Jun 11, 2019 at 12:22 AM.
I couldn't get their battery pack over 1 hour duration at 55% economy cruise (116 HP). That was at 350 watt hours/Kg and 270 Kg of battery. That seems like a far cry from the normal 6 hour flight time. Feel free to check my math.
Is the SFC of a piston engine fairly linear or is it like a turbine where it gets more and more efficient the more power it makes? If the latter, I could see the piston engine running wide open most of the flight and the electric only being used for takeoff and climb.
That is picking the obvious choice and the cheatingest choice at the same time. Handling of the plane is of course Cessna and it will fly about the same with either engine out. There is two different turbine STCs that turn it into a single. One front engined and the other rear. The rear engine one is faster. Obvious development choice but hopefully it has enough power to take off single engine on electric because that makes it useable power. That would be the only way to prove the necessity of the motor. Neat for what they are, 337s are slow for two engines so you don’t want the world full of them being passed by old 182s with the same useful load using essentially the same amount of fuel.
It will be interesting to see how these airplanes are treated by regulators and insurers. Once the battery is run low after the climb, if there's no longer enough juice to do a go-around or a missed approach, are you legal to execute a normal approach? Or, do you have to drone about to get the battery back up to snuff?
Is the intent to augment climb with the electric and cruise on the ICE, or climb with the ICE and use the electric in cruise as a sustainer?
One issue I saw is that it looked like the electric windmilled easily while taxiing with the ICE. They will need to lock or full feather the electric during ICE-only operation to prevent windmilling drag, unless there is some sort of regeneration going on.
Another article on Cafe blog: https://cafe.foundation/blog/ampaire-flies-hybrid-test-bed/
" no less than 14 small airlines signed up to use Ampaire’s hybrid drive system."
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