![]() At best you can find the best angle at any one given speed. In flight the line of flight of the fuselage as well as all those rather important parts connected to it is fluid, very fluid. So you can't pin it down to any sort of reference line be it the thrust line, datum line, center line or any other line. Why you ask? Because straight and level at max airspeed and straight and level at near stall speeds involves a change in the angle of attack of the wing and by connection the fuselage of a good 7 to 8 degrees. Modeone, if you have not figured it out by now there is NOline that can be used for a reference forflying straight and level. ![]() The aircraft company I worked in for so many years used the term "water line" on all their aircraft.ĭoesn't speak well for their optimism now does it. Sometimes they called the datum line the water line, btw. And they don't have to draw the datum line separate from the centerline, but often do to make it easier to place parts relative to each other. It can be drawn anywhere, just so long as it's drawn the same on all the blueprints that need to match other blueprints. They could have the datum line down the center of the fuselage, or they could run it along in space below the whole pile of parts. And they want the least drag (usually) at that speed, so they set the datum line of the fuse along that least drag line for the fuse and work from there. It's usually the cruise speed since the airplane's performance (speed and range) for that is the most important. ![]() Except maybe for the GeeBee and the Rata.ĭesigners usually start with a specific airspeed to work from. It basically a line that traces where the prop or jet would go if everything else wasn't along for the ride and encountering the air and it's effects. It's the line the jet engine pushes itself along. It's the line the prop pulls everything along. Thrust line is exactly what it says it is.
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