PPRuNe Forums - View Single Post - E-Fan X: R-R/Airbus electric drive demonstrator
Old 30th Nov 2017, 00:43
  #17 (permalink)  
wiedehopf
 
Join Date: Jul 2014
Location: Germany
Posts: 340
still an hour worth of power to get "airborne" is still reasonable if you want to include the climb

but yeah you are right i misunderstood because the quoted part was put in a better context in another post.

anyway estimating the cost of the batteries is the wrong approach.
especially because you are assuming power needed to get the plane off the ground with the current powerplant+fuel. with all the heavy batteries you have significantly lower useful load.

weight of a 15 MWh lithium ion battery assuming 300 Wh/kg:
a whopping 50 000 kg or 110 000 lbs
payload of 747 freighters is around 120 000 kg.

this should make it clear how ridiculous the idea is with current batteries sometimes i think people just don't get that. or maybe they do what do i know
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