Figure. Specific Endurance = flight hours/pounds of fuel OR flight hours/hour / pounds of fuel/hour ... ⢠Maximum Range = maximum of speed per fuel flow . 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). Flight Planning . So now you can find these speeds for your airplane. specific endurance = ----- lbs. Range must be clearly distinguished from the item of endurance. The following formula determines the specific endurance for any given flight condition. 6. Specific Air Range & Specific Endurance Key cruise parameters are Range (distance flown) and Endurance (time of flight). If maximum specific range is desired, the flight condition must provide a maximum of speed per fuel flow. maximum specific range varies only about 1 % from the mean value, which is equivalent to less than a 2-knot change intheheadwind ortailwind component. or 1 ----- fuel flow {p309} If maximum endurance is desired, the flight condition must provide a minimum of fuel flow. Aircraft are not designed solely for cruising; they must also takeoff and climb. 2 proportion to SMOE. Cruise Control. 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. As stated earlier, every effort is made to maintain the SG of ⦠Thrust Specific Fuel Consumption Is Lower Due To Lower Temperature Thrust Required (drag) Remains The Same At Best Endurance Airspeed Regardless Of Altitude Fuel Flow Is Lower At Higher Altitudes Up To The Tropopause So Specific Endurance Is Improved. Cruise control of an aircraft implies that the aircraft is operated to maintain the recommended long-range cruise condition throughout the flight. Figure 11: Airspeeds for maximum endurance vs. maximum range. Go to Top Final Thoughts . Question: What Is The Effect Of Altitude On Specific Endurance For A Jet Aircraft? To understand the impact this has on endurance, we have to look at brake specific fuel consumption (BSFC). As a result, your airplane is carrying around a lot more power than is required for cruising. The item of range involves consideration of flying distance, while endurance involves consideration of flying time. V max endurance = V max range = Best Glide Speed V optimum cruise = (Best Glide Speed) * 1.316. Specific Range â¢Affected by: âAircraft Gross Weight âAltitude âAerodynamic configuration of the aircraft 17 . 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 . This is a measure of fuel efficiency within a shaft reciprocating engine. AP3456 - 2-1 - The Effect of Variation in Specific Gravity of Fuels on Range and Endurance . 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. Peaks of the individual specific range (SR) curves occur at the sameCAS, while TAS, P. R, and FF all vary in. A brief discussion on cruise flight performance of piston prop aircraft, including two examples of range and endurance calculations. of fuel/hr.