The idea of heavier than air but lighter than deadweight seems to be a worthy compromise to explore but of course, if the engines fail or it runs out of sunshin

The idea of heavier than air but lighter than deadweight seems to be a worthy compromise to explore but of course, if the engines fail or it runs out of sunshine/fuel, it will not be able to stay up very long, just like any other heavier-than-air aircraft. Lest anyone brings up skilled gliders, I don't think with its wind-resistance this craft will glide for long either.