12 Nov 2025, 04:05 [ UTC - 5; DST ]
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Post subject: Re: Another Diesel Plane Posted: 20 Apr 2018, 22:57 |
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Joined: 11/06/10 Posts: 12190 Post Likes: +3074 Company: Looking Location: Outside Boston, or some hotel somewhere
Aircraft: None
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Username Protected wrote: I have no doubt that battery technology will continue to improve and it may in the long run be a fine partial substitute for carbon-based fuels but someone is going to have to explain what they are going to do with all the battery waste. In my business (environmental) battery manufacturers are a great source of revenue from releases of metals and corrosives. Can you explain some more. My knowledge on battery recycling is rather poor. I know there is a lot of theory around it, but wondering about the practical aspects. Tim
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Post subject: Re: Another Diesel Plane Posted: 22 Apr 2018, 07:38 |
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Joined: 12/22/07 Posts: 14721 Post Likes: +16853 Company: Midwest Chemtrails, LLC Location: KPTK (SE Michigan)
Aircraft: C205
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Username Protected wrote: i don’t understand how the electric car pays fuel tax. Every gallon of fuel that I buy has state, federal and local taxes to help subsidize the transit system. How does the electric vechicle contribute? Varies by state. Michigan increases the annual registration/tag fees depending upon whether HEV, PHEV or BEV.
_________________ Holoholo …
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Post subject: Re: Another Diesel Plane Posted: 22 Apr 2018, 09:12 |
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Joined: 11/08/12 Posts: 12835 Post Likes: +5276 Location: Jackson, MS (KHKS)
Aircraft: 1961 Cessna 172
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Username Protected wrote: And i don’t understand how the electric car pays fuel tax. Every gallon of fuel that I buy has state, federal and local taxes to help subsidize the transit system. How does the electric vechicle contribute? They don't really. And it doesn't really matter at the moment. Eventually the tax system will change. In New Zealand (at least 20 years ago) diesel cars were taxed by odometer. I think the idea was to avoid the on-road/offroad taxed/untaxed fuel.
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Post subject: Re: Another Diesel Plane Posted: 22 Apr 2018, 16:47 |
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Gasoline has about 46MJ/kg energy density. A really good Lipo has about 0.5 MJ/kg with laboratory best < 1Mj/kg
Gas engine is <25% efficient from Gas to tires...
Electric car is probably 80% from battery to tires...
Electric car reclaims energy when braking, gas car dissipates it.... (This does not apply to airplanes)
So assuming that your aircraft gas engine is 20% efficient, and the electric airplane motor is 90% efficient...
Then 1Kg of gas provides 9.2Mj of energy to the prop shaft.
1Kg of LIPO provides 0.45Mj So for the same range one has to carry 20 times as many pounds of Lipo.....
(This assumes that the weight does not effect range, in a car a valid assumption because you reclaim the acceleration energy in braking, not true for an airplane, so an airplane will be woorse than this)
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Post subject: Re: Another Diesel Plane Posted: 02 May 2018, 18:10 |
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Joined: 10/29/15 Posts: 46 Post Likes: +22
Aircraft: PA-28r
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I want to see an electric airplane design with a "range extender". Give it 1 hour of battery and some sort of Gas/Diesel engine to re charge the batteries. This would give the reliability and efficiency benefits of electricity. And it would reduce cost by allowing the gas/Diesel engine to be very basic, and even less reliable, since it the engine craps out, you still have an hour of battery to find place to land.
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