The Propulsion Duct assembly

For the propulsion system, also a duct is made to gaine efficiency in foreward thrust power.
 

Being limitted to 0.8 mm plywood, I have changed the duct a little bit, by laminating different sheets together to get a solid construction.
The initial round shape is made by bending the sheets of ply around a container of vitamine supplements :-)

The 3 little balsa rods are the fixed fronts of the elevators.
The original model has fixed elevators that also keep the duct in shape.
I use these 3 rods for that purpose, as a stabilizer, but will add movable elevators behind them to dinamically control balance while hovering at different speeds.  

Below the initial fitting of the middle elevator while the glue dries.