Is this EV or Hybrid?

The founder seems to sneak in the word "hybrid", around 1m30 mark in the video below.

https://youtu.be/nM86DBOqgPM?si=5unXLmPxk6M_kmuN&t=86

Note: not being negative, I just want to ensure I understand correctly since the title might imply something else.

Update: confirmed, it does use aviation fuel.

> "The airplane will also include a reserve-hybrid configuration, consisting of two turbo generators powered by sustainable aviation fuel. The reserve-hybrid system is installed to secure reserve energy requirements without cannibalizing battery range, and it can also be used during cruise on longer flights to complement the electrical power provided by the batteries."

https://www.heartaerospace.com/newsroom/heart-aerospace-unve...

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luma 3 hours ago | parent | next [-]

Hybrid after the first 125 miles, total range 500 miles. Their problem is diversions - an incident at the destination airport may mean an passenger aircraft may need to land at an airport which could be a couple hundred miles away. The hybrid powerplant throws the fuel efficiency numbers off so goal is not to run it unless needed, but they could not get certification without it.

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werdnapk 14 minutes ago | parent | next [-]

So what do regular aircraft do when they run out of fuel? They require a forced landing. Aircraft fly with a buffer of fuel though to avoid such situations, so why can't an electric aircraft fly with a similar buffer on it's range? ie. Always fly less than the current charged range of the aircraft.

	▲	MobiusHorizons 8 minutes ago \| parent \| next [-]
		Regular aircraft are required to have enough fuel to be able to divert to the alternate airfield in their flight plan plus all the margins for taxiing and waiting for a landing clearance. If a plane is low on fuel they can declare an emergency and get priority over other traffic, but that obviously is disruptive and should not happen on well planned flights unless something pretty significant happens after takeoff.
	▲	marcosdumay 10 minutes ago \| parent \| prev \| next [-]
		Regular aircraft fly with enough fuel to change into at least one other airport in an emergency (ideally two). That aircraft would need a very large battery to do that, and it's way more efficient to have some burnable fuel there that you'll never actually use.
	▲	luma 13 minutes ago \| parent \| prev [-]
		Simply put, batteries are heavy.

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misterderpie 3 hours ago | parent | prev [-]

For anyone looking for the reference, it's stated at 10:16 [0]

[0] https://youtu.be/nM86DBOqgPM?si=BdoZzp1Dxa4S3C_9&t=616

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class3shock 10 minutes ago | parent | prev | next [-]

The X1, which is what flew, is all electric. The ES-30, their proposed product, is hybrid.

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yndoendo 3 hours ago | parent | prev | next [-]

With limited information form their web site, both. Being able to run pure electric while switching to fossil fuel. [0]

The way modern hybrids can charge from an outlet, I classify them as EV-Hybrid, and only use gas if need be vs older ones that only charge through the gas engine, Hybrid.

[0] https://www.heartaerospace.com/es-30

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tuatoru 3 hours ago | parent | prev [-]

Surprised they are not using linear opposed piston crankshaftless generators to make an extended range EV aircraft.

Smaller, lighter, simpler, cheaper, and more flexible about fuel.

https://www.youtube.com/watch?v=NeG4zLlFkak

Linear engine starts around 11:19

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anonymars 3 hours ago | parent | next [-]

Turbines are extremely reliable and well-understood in aviation propulsion

	▲	MobiusHorizons 4 minutes ago \| parent [-]
		This! Anything unproven makes the flight certification process longer. They already have to get their electric side certified, might as well make the backup generator as easily certified as possible.

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bitwize 2 hours ago | parent | prev [-]

My father, a mechanical engineer, was a tireless advocate of the hypocycloid crankshaft mechanism. In the 90s, hybrid vehicles with a hypocycloid-based generator feeding the batteries that make the electric motors go was the application he was going for, especially since hypocycloids function best at constant RPM.

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strictnein an hour ago | parent [-]

I say this with all sincerity, I love this sentence:

"My father, a mechanical engineer, was a tireless advocate of the hypocycloid crankshaft mechanism."

For some reason just reading that brought a smile to my face.

	▲	bombcar an hour ago \| parent \| next [-]
		From mechanical engineers I’ve met it almost seems a requirement that they have something they tireless advocate for.
	▲	moab9 42 minutes ago \| parent \| prev [-]
		Yeah. I bet he was.