Rudder servo.
Spektrum AR6335 receiver. It is
an AS3X receiver but I did not program it so it is a dumb non-stabilized
receiver. Seems redundant to
put artificial stabilization in a free
flight design, might it hide thermals from me? The open area is
covered by a removable hatch.
Later that huge looking universal
connector was moved into the fuselage and connected it to the
ESC which is mounted
on the left side opposite the receiver.