Your drawing, lofted in 3D
Every outline here is measured off the three-view at 1:40 and smoothed into real surfaces. Drag to turn it, scroll to zoom.
The overwing is modelled as the crescent on your top view: a cuff that wraps the main wing's leading edge and widens into the outer tip panel. Wing setting angle (2°) and airfoil (NACA 2412) are my assumptions; the drawing does not give them.
Setup bench
Change the jet here. Every change rebuilds the 3D model and reruns the checks; then take the same setup to the tunnel or fly it.
Start from
Wing
Sliding the wing aft puts the lift behind the CG, which is what makes it stable. A wider tip and washout stop the tips stalling first.
Tail
A bigger tail lifts the nose earlier on take-off and adds a little stability.
Landing gear
Main wheels belong just behind the CG, with 8 to 15% of the weight on the nose wheel. A wider track resists tipping.
Load
Nose ballast moves the CG forward, but every kilo raises the stall speed.
Engines
Saved setups
Saved in this browser only.
Wind tunnel
Lift comes from a vortex-lattice solution of the wing, overwing, tail and fin. Tufts on the wing lie flat in attached flow and flail red where it has separated.
Mount
Held: you set the angles. Free: the model pivots at its CG and only the control surfaces steer it, which shows whether it is stable.
Lift curve
Pitching moment about the CG
A line that falls to the right means the nose comes back down by itself. Rising means unstable.
Flight test
Six-degree-of-freedom simulation using the same aerodynamics as the tunnel, the engine model and sprung landing gear.
Keys (click the view first)
S ↓pull back, nose upW ↑push, nose down
A D ← →rollQ Erudder and nose-wheel steering
Shift Ctrlpower up, power downF G Bflaps, gear, hold brakes
Does squeezing the exhaust add thrust?
A jet engine already ends in a nozzle sized for it. This runs the engine cycle (compressor, burner, turbine, nozzle) against the exhaust you drew.
Thrust against tail-nozzle size
Weights I assumed
Positions follow your engine, fuel and seat drawing. Weights are typical for a composite two-seat jet of this size; change them and the CG moves.
This is conceptual-design physics: potential-flow lift, section stall limits, a drag build-up and an engine cycle. Expect roughly ±15%. It does not check structure, flutter or heat.