So basically ROC data is compilied from the data derived from multiple sawteeth?
S~
Gunny
Yes. . .essentially you will establish a climb using climb power (remember to set mixture) at a given airspeed and heading, and plan this such that airspeed has stabilized once you cross the floor of the altitude range which you are testing the ROC. Timing starts once you cross that altitude floor, and ends when you cross the upper limit of that altitude range. So for initial ROC determinations you would fly fairly low over the ground at an airspeed close to that which you will use for the climb, and then pitch up while adding throttle to climb power and adjusting pitch to control airspeed. After this you will want to maintain this power setting, keep the wings level, maintain coordinated flight, and focus on maintaining a constant airspeed. Once you cross through the altitude block you will repeat this test at a slightly different airspeed,
So suppose you wanted to determine the ROC from 500 feet to 1,500 feet, and terrain elevation is 50 feet, and you think the best rate of climb airspeed is somewhere between 60 and 70 knots. As such you will want to pass through this altitude range multiple times at slightly different airspeeds. . .in this example you might use 60, 65, 70, 75, 80 and once you've found the two highest ROC values for those data points say 75 and 80, you will then use smaller airspeed increments to find the exact speed at that altitude range. Once you have found Vy (best rate of climb speed) for this altitude range you will then move the altitude range up and perform the test again at that altitude. As you climb Vy will decrease so you should have a fairly good idea as you climb what speeds should get you close.
