Raybanman

I fly the real aircraft, and when using this method, the simple formula I use is that for every 10 knots faster than your desired on path speed, descend 200 feet below path before re-engaging vnav. Example: you increased speed in the dive to 320 knots to get to path, and your desired speed when on path is ~270 (ECON descent with cost index of around 20). You are 50 knots fast, so allow the aircraft to descend 1000' (200X50) below path before re-engaging VNAV (or exit SPD INT). The aircraft will pitch up to a 1000'/min descent at idle thrust and the speed should bleed off to very close to the desired ECON descent speed by the time you re-intercept path. Don't be too worried if it doesn't return to exactly the same speed - it will slowly. Hope that helps!