The point was quite obvious in context. You stated, and I quote:
"Two years of testing and development doesn't seem unrealistic."
I pointed out the obvious. It's been over 50% longer than that.
But beyond that, "solid state battery is eternally a few years away" has been a thing for well over a decade at this point. It's the same marketing category as "fusion on planet's surface is 50 years away" and "lithium air batteries are 20 years away".
Water is wet.
This sort of "let's state the obvious and pretend something so profound was uttered so it can stand on its own with no other commentary"-posting is not helpful.
Racing gliders are a specific subset of gliders that are optimized for higher speed gliding. They generally are single seaters (with some exceptions of two seaters in one behind the other configuration).
Most important difference is fuselage and wing shaping to generate optimal laminar flow at different speeds compared to normal gliders. I.e. those are the ones that get best glide ratios at 100kt and up.
Most people don't seem to know that the reason why gliders have that distinct shape is because they're optimized for laminar flow around at a very specific subset of speeds. Going off that subset in either direction disrupts the flow, generating eddies and therefore increasing turbulence and drag.
I suspect you're thinking racing gliders. This is a side by side seating glider with a wide canopy.
Well over three years.
For the record, this is a modded powered glider. These can fly way more than 600 miles, provided that terrain and weather conditions are suitable. Current record for a glider is over 3000km.
But you need specific geographic conditions for that sort of flight, where winds hit the mountains sitting next to a large body of water causing incoming wind to reliably rise up on one side of the mountains, and then going down the other side. Glider rides this constantly rising air. I.e you need something like Andes.
Propulsion is something you use to take off and give glider a push up when it can't find rising air for a prolonged period of time.
Work is the crab grass in the lawn of life. -- Schulz