Runtoeat Posted November 9, 2012 Report Share Posted November 9, 2012 I have recently been working with a rough field take off technique which my friend wanted to try out. Conventional rough field takeoff uses 15 flaps and requires one to hold the stick back and allow the aircraft to use high angle of attack (low tail) to gain enough lift to "pop" off the ground. The nose is dropped to gain enough airspeed to start a normal climb out. This method can allow the tail to contact a bumpy terrain and also takes some distance to get off the ground. Our idea is to lift off from a rough grass field in a minimum distance and at a level attitude. In order to do this, we are using full flaps (35 for CTLS and 40 for CTSW) and holding the stick back on initial roll. As the plane begins to lift off, which occurs at around 35kts, one relaxes the stick back pressure to just keep the front wheel off the ground. In another few kts, as soon as the main gear starts to skip off the turf, back pressure is relaxed and when the mains are off the turf, one needs to immediately put significant forward pressure on the stick to hold the plane within a couple feet of the ground and allow it to build airspeed. Once the airspeed gets to 50 to 55 kts, flaps are reduced one notch and the stick is adjusted for 60 kt speed. Once at 60 kt, another notch of flaps is taken away and the climb out is done at 15 flaps and 60kts. During the initial take off stage, the aircraft has high drag and an engine problem would result in a very quick loss of altitude so by being close to the ground, one should be able to land if required. But the trade off for having max flaps is that the aircraft develops lift and reduces harsh input on the gear almost immediately after initial roll and then lifts off the runway at a very short distance and at a level attitude. The feeling is almost like being on an elevator. The CT just rises off the runway all the while at a level attitude. With a little bit of head wind, the vertical lift effect is pretty amazing. Link to comment Share on other sites More sharing options...
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