Okay, I was going to deride this (60000+ feet for a 7 horsepower propeller aircraft seems ludicrous, a typical 200 horsepower light propeller aircraft can't cli

Okay, I was going to deride this (60000+ feet for a 7 horsepower propeller aircraft seems ludicrous, a typical 200 horsepower light propeller aircraft can't climb above 16000 feet, and the thin air increases required propeller RPM as you climb). However, it seems that Boeing has already managed to send a solar-powered ROV to 67500 feet. Admittedly only for a few minutes, but it doesn't any longer seem like such a stretch. Amazing what concepts a huge budget and no requirement to satisfy the public market can give you. I wish I could work on something like this...