Quote:
Originally Posted by Autobahnschleicher
I'd argue the ultimative hypermiler vehicle would be a small plane based on a glider that has a small diesel engine.
Such planes can have a glide ratio of about 1:50 at a weight of 500-600 kg.
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Solar gliders do exist, (although technically all gliders are solar really due to thermals), but gliders with solar panels exist. I do agree, theoretically infinite lift from thermals, and then battery and solar backups creating self launch capabilities.
I did wonder once, about wave lift, because that can go up to incredible heights. Theoretically, commercial airliners could fly along these lift lines and reduce fuel, but the passengers would hate it due to turbulence, the airlines would hate it due to having to take detours, the ATC/legal team would hate it because of the skyway restrictions.
I have never experienced wave lift, but circling in a thermal is certainly an interesting experience.