![]() ![]() The Cirrus Sr22 Turbo is a turbo normalized engine with some pretty tight tuning. In areas of high mountainous terrain the ability to efficiently climb and cruise above the terrain and weather is a great advantage. that is relatively flat there is no compelling reason for the turbo. If your mission is flying over the 1/2 of the U.S. Though fuel burn would be high, at 5,000 ft or so the turbo will begin to pull away from the N/A engined plane. In fact, if you wish to produce 100% power, the turbo normalized engine will do this for you. Note that in the graph only 85% of rated power for the turbo normalized engine is utilized. So, yes the naturally aspirated engine will produce better performance to a point. However, pushing the air through radiator like device causes even further pumping losses. In an effort to fix this problem, the incoming air is greatly cooled through the use of an intercooler. Hot air containers fewer air molecules compared to cold air at the same pressure. In an air cooled engine, hot intake air causes excessive heat and reduced detonation margin in an engine that is already heat stressed. ![]() Also, as the incoming air is pressurized by the turbo it is heated a great deal, often in excess of 100 degrees. This is a fairly small loss, but is a source of some loss of power. When the exhaust exiting the engine drives the “hot” side of the turbo it is taking energy from the “pump”, the engine. But knowing that I want to use the plane largely for business travel and with other people, Oxygen would put a damper on the whole experience.Īnd that’s how I selected the SR22 GTS, Normally Aspirated engine. ![]() My decision would have been totally different if either a) there was a pressurized cabin option or b) I expected to do most of my flying alone. I suspect that most of the time, I’ll be right at that 10,000 ft level, so my performance benefits would have been near zero. Although the SR22 Turbo GTS comes with built-in oxygen, I just don’t see myself or passengers ever wanting to use Oxygen for most of my travels. Plus, for the real benefits of the Turbo, you need to be at oxygen-required altitudes.
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