Fuel-Less Gravity Powered Airplane

anyone here know what the conservation of energy is? or the equation E=mgh?
it gains no energy if it starts and ends at the same altitude.
the source of the energy here is the compressed air tanks that are stored on board.
the recompressing of the tanks when it dives down would work great if there was no friction in the compressors, with the atmosphere, etc...
the energy stored in the compressed tanks is all this plane has to work with and since we can only compress air a bit, not much energy

So its basically a giant blimp?

I've looked at your website. You've got a great project going there. Good luck with the concept.

"What range do you expect with compressed air until the tanks are depleted?"

Use of the compress air, for pushing, is minor aspect of this design. Compressed air tanks are refilled several times during the flight.

"why not use solar panels or even better hydrogen fuel cells to power electric motor-driven turboprops."

This may be implemented. There are many configurations possible. Electric motors may capture energy during dissent too. Through testing, efficiency comparisons can be made.

..secondly the 'fueless' part.

You're using compressed air jets which provide much lower thrust than a turbopropellor would. What range do you expect with compressed air until the tanks are depleted?

If you want to keep it 'green' and eco-friendly, why not use solar panels or even better hydrogen fuel cells to power electric motor-driven turboprops.