This project started from a video I came across while researching boundary layer control - Once I saw how drastic the changes in the flow field could be from some surface blowing I knew I had to give it a shot.
I implemented circulation control through trailing edge blowing. A diverter door channels air from behind the EDF up into the wing. From there it distributes along the wingspan and exits through a slot, turned down by 45 degrees, at the trailing edge. This should in theory increase circulation over the entire section when active, and is also positioned to blow on the upper surface of the flaperons when they are deployed, F-104-style. EDFs are generally not good at dealing with flow restriction - though as long as you keep the outlet ducting at a reasonable %FSA it seems to work out. A test wing with an 85% FSA slot worked well, but the final version stalls the fan and has reduced flow (though still considerable) due to the ESC and wiring blocking some of the internal cross-section and constricting flow.
I'll also be testing 'drooperons' or leading edge flaps due to their use on one of my previous aircraft, the Cormorant II.
This will be the second installment of the Efflux Series: the first was an in-flight thrust measurement rig for a variable outlet area nozzle. The Efflux Mk. II uses the same avionics (graciously donated by @CampRobber btw) and powertrain as the Mk. I. The flight controller enables measurement of accelerations, airspeed, vehicle orientation and body rates, as well as providing control to many more servos (and with many more mixes) than a standard tx/rx combo.
Here's a walk-around of the craft, including a demonstration of the trailing-edge blowing system:
-Demonstrate an increase in maximum lift coefficient with the flaps extended by drooping the leading edge
-Demonstrate an increase in maximum roll rate at high airspeeds by differentially deploying the drooperons along with the ailerons
Goals (Trailing Edge Blowing)
-Demonstrate an increase in maximum lift coefficient both with the flaps up and down with the blowing system active