KRÅKAN - "Push-Pull, Tandem Tilt-Rotor, VTOL Aircraft"
For the last decade, tilt-rotor VTOL aircrafts like "V-22 Osprey" or "V-228 Valor" are merging the best part of both fixed and rotary wing aircrafts into one airframe.
To leap the tilt-rotor concept ahead; Kråkan utilize the rotors in "push-pull configuration" to reducing the prop drag, thus increasing the forwards speed. Moveover, longitudinal inlined rotors offer a naturally self-stable airframe during hovering, increasing the safety compared to traditional tiltrotor aircrafts' dangerous unbalance during hovering.
As an analogy, Kråkan flies fast like a Dornier Do-335, and hovers stable like a Boeing CH-47 Chinook
Hover like a helicopter < > Glide like an airplane
After climbing into safe altitude, front rotor tilts forwards to increase forward speed and lift on rigid wings; flying like a gyrocopter. When the forward speed is high enough, rear rotor tilts back by reversing prop-pitch from positive to negative.
Kråken's 2 powerplants and 2 rotors are connected to each other by transmission, maintaining the lift in case of single engine failure.