Skymaster SM-420 Concept

A new plane I was dreaming about, if there was such a company!
So this plane is a regional airliner, with a special feature of having the engines mounted with the wing! The engine is at the same level as the wings, and the wings are fixed at the top, not bottom of the plane. Also, the plane is strudy, and the engines use less fuel than ever.

Only this version exists - the ER version. It has less space, and also has the original 3 crew team in the cockpit - for safety measures, digital avionics mix with analogues and dials, thus requiring the need for a Flight Engineer. As per usual, this is optional.
This plane is the commercial version.

Update!
SP and SR versions will be released. Also, a business version will be done.

This is a concept! There is no such plane!

Colour code:
Blue - Stabilizer
Grey - Flaps, Elevators, and Rudder
Yellow - Spoilers
Pink (I love pink, come on!) - Cargo door (2 doors)
Red - Winglets
Green - Ailerons

Specifications of SM-420ER - Extended Range
Crew: 3 (Captain, First Officer, Flight Engineer.)
Passengers: 58 (total with crew)
Type: Regional Airliner
Range: 1,950 + 400 nmi
Engines: 4x Textron Lycoming ALF-502R-5 (has to be modified)
                 2x P&W JT8D-219 (has to be modified)
                 2x CFM56-7B27 (standard)
Thrust: Lycoming   31 kN - 37 kN (forced to 42 kN - 44 kN > airframe has to be lighter)
             P & W           96.5 kN - 97 kN (forced to 104 kN - 107 kN > airframe has to be lighter)
             CFMI            121 kN - 123 kN (standard)
Registration: SM-420
Cargo: close to 8 pellets
Max. rate of climb: 4,000 feet per minute.
Service ceiling: FL 340, 10363 m
Length: 73 blocks