Bullet blimp.

[synchro1]

These face and barrel gears are at 90 degrees and seat with no frame 🌹One face gear on the cone frame and a second behind the 3 blade propeller would compress the two barrel gears with the rubber band pressure and keep them in place.
The barrel gears are "Free Riding"!The barrel gears are pulled toward the center and the block pushs them off. We should be able to build a working model from toy store parts now.

[synchro1]

This ebay gear package is under $4.00 from China,  and includes a 3 blade propeller the 2 face gears and 2 barrel gears.

[synchro1]

The pale Green face gear on top can attach directly to the back of the propeller. The bottom yellow side to the cone mount. Pressure from the elastic band will keep the barrel gears fixed in position. We may need to widen the center holes in the face gears with a drill. This design could set a distance record fror a wind up rubber band toy aircraft.


https://www.youtube.com/watch?v=xda1WgL9fd0

[synchro1]

Toy gears from Amazon. I can see the matching face and barrel gears in this four dollar toy gear set on Amazon. The cone can be enlarged in diameter to a ring with a slender tube trailing behind for the rubber band. The Cyclo rotor wing area and the propeller diameter can be enlarged or reduced with the extension of the rubber band housing. The " Dragonfly "  Turbo prop cyclo ring! Amphibplanetary Mars flyer.!

[synchro1]

Imagine if Elon Musk adopted these Mercedes aerobatic fins to his heat shield titles.