Minimal required annual revenues for Leader-type icebreakers depending on the duration of construction Тс = 4–10 years, capital costs K = 64–159 Billion RUB, discount rate r = 1–11%/year and the investment return period Θ = 40 years (а) and 15 years (b) with yearly average capital costs K/Тс = 15.9 Billion RUB/year and operating costs Y = 1.5 Billion RUB/year. Calculation performed using Formulas (5) and (6). 1 – Tc = 4 years, K = 64 Billion RUB; 2 – Tc = 7 years, K = 111 64 Billion RUB; 3 – Tc = 10 years, K = 64 Billion RUB.