As a result, your airplane is carrying around a lot more power than is required for cruising. Specific Endurance = Flight Hours per Hour / Pounds of Fuel per Hour. It simply the rate of fuel consumption divided by the power produced and can also be considered a as power-specific fuel consumption. Specific Air Range & Specific Endurance Key cruise parameters are Range (distance flown) and Endurance (time of flight). The item of range involves consideration of flying distance, while endurance involves consideration of flying time. Figure 11: Airspeeds for maximum endurance vs. maximum range. While the peak value of specific range would provide maximum range operation, long range cruise operation is generally recommended at some slightly higher airspeed. Range Vs Endurance 16 . of fuel/hr. 6. Go to Top Final Thoughts . or 1 ----- fuel flow {p309} If maximum endurance is desired, the flight condition must provide a minimum of fuel flow. 2 proportion to SMOE. The following formula determines the specific endurance for any given flight condition. Peaks of the individual specific range (SR) curves occur at the sameCAS, while TAS, P. R, and FF all vary in. As stated earlier, every effort is made to maintain the SG of ⦠Specific examples of aircraft designed for these conditions include Burt Rutan s Voyager (maximum range), Unmanned Aerial Vehicles (maximum endurance), U-2 reconnaissance aircraft (maximum range and altitude), and the P-3 Orion submarine hunter (maximum endurance). Aircraft are not designed solely for cruising; they must also takeoff and climb. V max endurance = V max range = Best Glide Speed V optimum cruise = (Best Glide Speed) * 1.316. Flight Planning . It is important to be able to relate these to the amount of fuel burned; in particular, it may be desirable to maximize the range or the endurance for a given quantity of fuel. To understand the impact this has on endurance, we have to look at brake specific fuel consumption (BSFC). Specific Endurance = flight hours/pounds of fuel OR flight hours/hour / pounds of fuel/hour ... ⢠Maximum Range = maximum of speed per fuel flow . Cruise Control. This is a measure of fuel efficiency within a shaft reciprocating engine. Specific Range â¢Affected by: âAircraft Gross Weight âAltitude âAerodynamic configuration of the aircraft 17 . If maximum specific range is desired, the flight condition must provide a maximum of speed per fuel flow. Figure. maximum specific range varies only about 1 % from the mean value, which is equivalent to less than a 2-knot change intheheadwind ortailwind component. Range must be clearly distinguished from the item of endurance. specific endurance = ----- lbs. Cruise control of an aircraft implies that the aircraft is operated to maintain the recommended long-range cruise condition throughout the flight. 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