I'm interested in the maximum L/D this plane can achieve. I can't find the necessary data to do the calculation myself.
If I knew the "long range cruise" engine power and assumed 85% propulsive efficiency I'd get pretty close to the real number, correct?
Is the optimal L/D achieved at the so-called "long range cruise" speed? According to Wikipedia this speed is 589 km/h (366 mph, 318 kn). Is this number correct?