There's an interesting article at BBC about a plane being built to break the world speed record for electric aircraft. The existing record is only 185 knots (213 MPH, 342 km/h). That's for a 3 km course, which seems to me to be particularly well suited for electric power since a battery can put out lots of power only for a short time. Anyway, I looked up the historical speed records, and it turns out that 342 km/h is pretty much where the world record (for all kinds of planes) was exactly 100 years ago, in 1921. I thought that's kind of interesting, that battery power is lagging 100 years behind piston, for airplane speed.