Ganito yan, wala akong kakilalang piloto kaya di ako makakapagtanong pero may nahanap akong makakasagot sa tanong mo. Pero sana masagot mo din muna yung mga nauna kong tanong sayo before na di mo nasagot bago mo ako tanungin.
"A plane will fly at a constant altitude and will follow the curvature of the earth and would not gain altitude during a level flight.
For instance, if a plane is cleared to maintain 35,000 feet, by regulations, the pilot must maintain that level based on a standard barometric pressure setting (29.92 inHg or 1013 millibars) Hence it would stay at that altitude (FL350) because the pilot is either controlling the plane manually or has engaged the autopilot to achieve that.
There are two basic instruments that enable this procedure - an altimeter and a vertical speed indicator (VSI). The VSI provides short term changes in pressure and indicates whether the plane is climbing or descending. These changes will give an indication to the pilot so that he would level the plane to maintain 35,000 feet. He will adjust the controls very slightly by use of the elevator and trims. This can be performed automatically by the autopilot as well. As such, the flight controls are constantly moving very subtly to maintain the correct attitude.
You said that, if the plane was trimmed for a straight and level flight, it would ‘gain altitude’ while flying as the earth surface ‘fell away’ due to the curvature of the earth. Well, that would probably happen in a perfectly motionless atmosphere where the plane would fly dead ahead, and over time gain altitude (provided it has sufficient thrust) as the earth curves away from under the airplane.
In reality, a constant altitude must be kept using the standard pressure and that means a fixed distance to the earth center of gravity is maintained, making the path of the plane a curved one.
So, a plane is not flying a straight line - geometrically speaking!"
and it make sense nga naman di ba? Theory lang naman kayo, wala nga flat earth believer na makalabas ng outerspace para makunan ng evidence na flat ang mundo. Sana noon pa may lumabas na actual photos and videos. At sa tingin mo pano ka nakakapanuod ng tv kung walang bagay ang nakakalabas ng outerspace? Sabi mo di nakakalabas yung mga rockets. Kung di mo alam parang ganto ata yun base sa aking stock knowledge. Nagbabato ng Signal si TV station sa Satellite na nasa Space tas ibabato sa mga Tower at papunta sa mga kabahayan kung di ako nagkakamali.