Acoustic Transducers can thicken the air and for a Blimp or powerless aircraft this can mean increased pressure on the inside to increase buoyancy, but on the outside it can be a means of propulsion. If the air behind the blimp is very thick and compounded by acoustic transducers while being restricted the airflow will be forward.
I advise a "V-Shaped" inflatable aircraft design view blimp with a twin boom tale, the rear of the blimps "V-Wing" will not taper in the back, but form a flowing convex rear in a "U-Shape" with the twin tales.
Pressure Transducer
There is already a similar type view from a fantastic explore scientist out of Georgia Tech. I believe this to be a good design, as it is a design, which can fly without power, a "powerless aircraft," we will modify on his already great design.
I advise that the acoustic transducers are pointed at the back of the main wing for propulsion in a crossfire pattern to generate rogue sound waves and thicken the air pushing the aircraft-blimp forward. The acoustic transducers will be run from a propeller on the front of the blimp as it glides. Although this idea is merely a concept, with a little mental it could come to be a reality. We may also wish to use a laser instead of a set of acoustic transducers, by utilizing some of the gas, which is keeping the balloon aloft. Anything is done this view should be explored; So, think on it.
Powerless Aircraft Acoustic Transducer Push succeed