| Dadhawk |
12-15-2019 08:12 PM |
Quote:
Originally Posted by Atmo
(Post 3283301)
I wondered about that too, plus useful load, flight into known icing prevalent there, cold weather performance degradation and airworthiness in general with the battery weight presumably in the wings.
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Well, I figure in a conversion you could put weight in the wings equal to the landing fuel weight minus some fudge factor. Of course that means you are always carrying that weight around, so it's costing you to fly the weight, plus you can't use "fuel" to help with weight and balance on shorter flights.
For a conversion you are going to have to have a plane with a pretty steep fuel capacity to get anything useful out of the conversion. You certainly couldn't do it in a small plane. The reason it works in larger planes is because you can get enough batteries in there to be useful.
For example, mine is a two seater that will fly 4 hours with reserve on the 27 gallons on-board. Given that a Tesla Model S battery back weighs 1,200lbs, you aren't going to get much range out of converting mine to battery given the 162 pound weight of the fuel capacity. You might be able to taxi it to the end of the runway.
I'm not accounting for the lighter engine, etc you'd get with the conversion, but in the end its all marginal, and not even worth considering for any practical purpose.
Eviation says they'll get almost 600NM out of their 3,600kg battery pack in their 9+2 jet. Not sure a 2,500 lb useful load is really an 11 seat aircraft with 227lbs per passenger (including luggage, etc) particularly when you can't adjust fuel to accommodate but they are at least doing it right, designing the plane from the ground up.
(And yes I realize my conversion description is oversimplified, but I think its a starting point to show its probably not practical under a certain size)
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