When I get a new aircraft, I am always interested in determining my throttle and rpm settings for climb, cruise and descent, along with the airspeed and fuel consumption within FS. In case anyone is interested, this is what I found for the RealAir Spitfire. These settings are a little higher than is recommended, but I like to fly fast. Fuel consumption was the same at every altitude since their is no mixture control to lean the mixture (at least fuel consumption was constant in FS in my tests).Given that the fuel capacity is only 111 gallons, I don't fly for more than an hour before refueling. This is one of my most enjoyable aircraft to fly.Climb-----Throttle: +12 boosterPropellor: 2800 rpmRate: 3000 feet per minuteIAS: 265 mph - 15 mph per 10,000 ftFuel Consumption: 110 gallons per hourCruise------Throttle: +8 boosterPropellor: 2500 rpmRate: 0 feet per minuteIAS: 290 mph - 15 mph per 10,000 ftFuel Consumption: 80 gallons per hourDescent-------Throttle: +4 boosterPropellor: 2200 rpmRate: -3000 feet per minuteIAS: 330 mph - 15 mph per 10,000 ftFuel Consumption: 55 gallons per hourScott

Interesting and helpful information.The reason your fuel consumption remains the same at different altitudes is because the engine is turbocharged. Separate from the engine, there is a special fan, called a turbine, that spins around and compresses air. This compressed air is fed into the engine's cylinders along with fuel. The manifold pressure gauge ('boost') measures the pressure of the air going into the cylinder. The greater the pressure of the air going into the cylinder, the more fuel that can be injected into the cylinder to maintain an optimal fuel/air mixture, and the airplane's engine produces more power. Consequently, with turbocharging the engine always performs as if it were at a specific, usually fairly low altitude (such as sea level or better) regardless of the airplane's actual altitude. Too much air pressure ('overboosting') can damage the engine.What do you mean when you say IAS: and then give a value of like 15 mph per 10,000 feet - can you clarify what that means? Just curious

Thank you for the explanation of a turbocharging engine. That was very helpful.When I did my testing while climbing, I noted the Airspeed Indicator at different altitudes. I found the following while climbing:@05,000 - 260 mph@15,000 - 245 mph@25,000 - 230 mphAnd while crusing:@10,000 - 275 mph@20,000 - 260 mphThus it seemed a consistent pattern that for every 10,000 feet of altitude, with the same power settings, the Indicated Air Speed (IAS) decreased by 15 mph. I believe that is normal because of the difference in air pressure at the different altitudes.One of the main reasons I do this is to know what numbers to plug into FSNavigator for flight planning purposes.Scott