📌All measurements will be in zero wind conditions.

📌Highest speed will be measured in level flight without overheating the engine even in hotter regions of the map. Vertical speed should be close to zero, use altitude hold if available. You can use altitude hold microcontroller from my aircrafts freely in the collection. Specify required settings for reaching highest speed such as throttle or propeller values if you want.

📌Cruise Speed is designer's specified speed for efficiency when calculating range. It needs to be measured in level flight. Specify required settings for cruising such as throttle or propeller values if you want.

📌Endurance is the amount of time an aircraft can stay in the air without refueling.

📌Range is maximum distance you can reach at cruise speed without refueling.

📌Composite Airliner Value is combination of passenger capacity, cruise speed and range. Since speed is harder to achieve than other two factors, its impact is greater. You don't have to calculate but here it is:

A = (0.001 * S * S * R * P) ^ 0.5
A: Composite Airliner Value
S: Cruise Speed (Km/h)
R: Range (Km)
P: Passenger capacity (if passenger cabin is sealed, multiply P by 1.1)

I suggest ZE Fuel Consumption Calculator by Uran Wind for range and endurance: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2565111412