RE: How to Correct Measured Thrust for Density Altitude?
Based on my testing here in Colorado at 5400', we lose about 3.5-4% per 1000' (desnity altitude). I've tested several different brands of turbines and for the most part came up with the same results. All my tests were done using the same equipment and the actual density altitude was calculated based on current conditions at the time of the test.
The 200 class engines push about 38-39 pounds here and the 160-170 class turbines push about 28 pounds. Those are averages for 6000-7000 density altitudes we see here on cool days. In the summer when we regularily see 9000', it's much worse.
There's a noticeable difference in thrust when I travel to FL to fly.