Yeah, but believe it only once you see it. If you've ever followed sciencedaily.com, you'd find significant claims - all with at least some credibility - seemingly several times a week. That's not to say what you linked isn't an upcoming advancement in lithium battery design, or perhaps one of the many I've read about before, but afaik, none of them are in the commercial stage. It's also possible that there will be several advancements in the time between now and when the above goes commercial, so it won't appear to be such a massive leap from the previous generation. And that's ok. 5-8% increase in specific energy density per year is a safe bet. We'll get there.https://electrek.co/2017/12/12/battery-researchers-claim-lithium-metal-breakthrough-to-triple-electric-car-range/
Does this get us any closer?
Batteries are getting there. The new Zero motorcycles packs are almost 230 whr/KG at a pack level. More is possible, especially now that actual money is being put into the industry.
I compared 2 power-plants, similar power, electric vs internal combustion engine (ICE). The result I condensed in the following graph:
View attachment 68958
The electric motor weight is only a fraction of the weight of the ICE. The graph sows that for short trips the weight of electric motor + batteries is smaller than for the ICE + gas. It seems that for aircraft specifically designed for short trips, under an hour, it makes sense to go fully electric.
I used values for real batteries you can buy and weight data from engine and motor datasheets. The future batteries I expect to be better in the specific energy department so it makes sense to start investing in an electric power plant. The fact that an electric motor does need only a fraction of the cooling compared to an ICE, so reduced cooling loses and the fact that cowling can be more aerodynamic, reducing drag is not taken into consideration, and only can help.
I did this for a study on personal VTOL aircraft that could be used for commuting. For a VTOL aircraft there is a big difference in how much power is needed in hover/transition versus cruising. In this case an electric motor have also the advantage to be highly efficient even when needs to output only a fraction of it's maximum power.
More details about my project here: aliptera.com
Unless I'm losing my mind, it looks like they're equal in weight around the 20 minute duration mark.Dusan,
Good luck, and have fun chasing the dream.
Am I reading it that you think 20HP is the target power?
Why does at 40HP the electric out weigh the Rotax from the start?
5 minutes is enough to launch a VTOL. But I haven't seen any electric system that is lighter than a two-stroke. The giant overpowered models that displayed enormous power at Oshkosh 2017 were two stroke. If electric was lighter they would use it.Sure thing, but who wants an aircraft that flies only 5 minutes anyway?