Inheritance: SpaceSim.Spacecrafts.FalconCommon.F9S1Base
        public static List<ISpaceCraft> BuildAutoLandingTest(IMassiveBody planet, VehicleConfig payload, string craftDirectory)
        {
            var f9 = new F9S1(craftDirectory, planet.Position + new DVector2(0, -planet.SurfaceRadius - 7000),
                              planet.Velocity + new DVector2(-400, 400), 3500);

            return new List<ISpaceCraft>
            {
                f9,
            };
        }
        private static List<ISpaceCraft> BuildF9Dragon(IMassiveBody planet, string craftDirectory, VehicleConfig vehicle, float offset = 0)
        {
            var dragon = new Dragon(craftDirectory, planet.Position + new DVector2(offset, -planet.SurfaceRadius), planet.Velocity, vehicle.PayloadMass);
            var dragonTrunk = new DragonTrunk(craftDirectory, DVector2.Zero, DVector2.Zero);

            var f9S1 = new F9S1(craftDirectory, DVector2.Zero, DVector2.Zero);
            var f9S2 = new F9S2(craftDirectory, DVector2.Zero, DVector2.Zero, 8.3);

            dragon.AddChild(dragonTrunk);
            dragonTrunk.SetParent(dragon);
            dragonTrunk.AddChild(f9S2);
            f9S2.SetParent(dragonTrunk);
            f9S2.AddChild(f9S1);
            f9S1.SetParent(f9S2);

            return new List<ISpaceCraft>
            {
                dragon, dragonTrunk, f9S2, f9S1
            };
        }
        private static List<ISpaceCraft> BuildF9(IMassiveBody planet, VehicleConfig vehicle, string craftDirectory, float offset = 0)
        {
            var demoSat = new DemoSat(craftDirectory, planet.Position + new DVector2(offset, -planet.SurfaceRadius),
                                      planet.Velocity + new DVector2(-400, 0), vehicle.PayloadMass);

            var f9S1 = new F9S1(craftDirectory, DVector2.Zero, DVector2.Zero);
            var f9S2 = new F9S2(craftDirectory, DVector2.Zero, DVector2.Zero, 13.3);

            demoSat.AddChild(f9S2);
            f9S2.SetParent(demoSat);
            f9S2.AddChild(f9S1);
            f9S1.SetParent(f9S2);

            return new List<ISpaceCraft>
            {
                demoSat, f9S2, f9S1
            };
        }