Mirmidon hace 1 año
Qué le pasa al aterrizar?
Que es extremadamente difícil y no se corresponde en absoluto con los datos que conocemos del A4. La respuesta del motor es horrible. El A4 era conocido por lo bien que mantenía el AoA on speed una vez compensado y simplemente tenías que tocar la potencia para seguir la bola. Era tan fácil que la transición al mucho más difícil F14 se podía hacer una bola:
One of the beauties of the TA-4 was that in the approach environment, it flew exactly like what you were taught to think a navy jet should fly like. Attitude controlled airspeed and power controlled rate of descent. So once you got it trimmed in pitch, it pretty much maintained that speed. If you started to see a change in glideslope from the meatball, you simply made the appropriate power correction to return to a centered ball. I loved flying it, and the way that it flew.
¨(...)the skills that I had mastered flying the TA-4 would to some extent come back to haunt me as I moved on to the mighty F-14A Tomcat(...)As the wings came level I noticed that the ball was starting to go slightly high, so I reduced the power, but after several seconds the ball was getting higher and I was starting to get indications of being slightly slow. I tried giving it a little more time, but the situation only got worse(...)Finally I pushed the nose down and the ball started to come down and we got back on speed. As we approached a centered ball I added power to slow the descent, but very quickly we were getting low and fast. These cycles continued down to an uneventful touch and go(...)
(...)By this time I was beginning to realize that the techniques and motor skills that had worked so well for me in the TA-4J were not working so well in the F-14. The Tomcat was definitely a different jet to land. It had a lot of lift when fully configured to land, especially with no missiles, rails, or external fuel tanks. The old adage of “attitude controls airspeed and power controlled rate of descent” didn’t work the same way in the F-14. If you wanted to change the rate of descent, it needed a power correction, but you also had to nudge the nose up or down some to get a quicker response to the power change(...)
Sufriendo aprendiendo a volar el F14 (por cierto niñas del RAG, este artículo es de obligada lectura aunque sea en inglés, lo pondré en la cabecera)
Esto lo llevo sospechando desde que empecé a volar el A4. Pero como yo no he volado el A4 en la realidad me guardé mucho de criticar o solicitar arreglos, hasta que hace un tiempo encontré unos posts de un antiguo piloto de A4 de la Navy, piloto de pruebas y veterano de combate, va por RichRach en los foros, que suponiendo que lo haya sido de verdad, vino a confirmar lo que suponía:
I flew the TA-4J in training with the US Navy. The flight model (del mod) is excellent with one exception, landing. Regarding sensitivity of the flight controls in a sim, the original aircraft had a roll rate of 720 degrees a second, two complete revolutions in that second. Full stick deflections were limited to one roll of 360 degrees (one half second) due to the probability of entering a "coupled roll" where the aircraft could become unrecoverable. It was an insanely responsive platform!
Regarding landing, the flight model is terrible. Response to power to control glideslope is not even close to the real aircraft, or any aircraft I have flown. Not sure how one would fix this as other sims have gotten it right in the past, most notably Janes F/A-18 from many years ago.
In simple terms, when a Navy jet is trimmed on-speed for approach addition or subtraction to power makes an immediate impact on VSI (vertical speed). There is zero time lag (other than the spool time of turbofan engines. Useless trivia: Jets of the A-4's era had much less spool lag, being turbojet engines. It was still there but much smaller.) Reduce power plane go down. Increase power plane go up.
There are many videos out there these days of pilots flying at the boat. Watch the amount of changes and the speed of those changes in throttle position. Two things to notice. First, the nose pitch/attitude relative to the horizon, does not change at all. Second, the pilot is controlling the glide slope entirely with power, not nose. Watch the stick in those videos. The pilots almost never make a movement of the stick forward/back, only side to side. Power = glideslope. Stick = lineup.
This is not the case in the A-4E model. The first thing to happen in the game is speed changes. Then the AoA and pitch follow. VSI lags these responses. In reality it is just the opposite. Actually, power changes instantly affect VSI, airspeed follows, slowly. AOA lags both these. Its physics. Lineup, meatball, AoA is how one flies at the boat. Airspeed is not even in the scan.
Richrach post
Duplico este post en hilo del A4, por si queremos seguir allí
Ya está muy olvidado, pero este curso sigue las reglas originarias del ESA que los jovencitos ni siquiera habrán escuchado
