Comment

Comment by Ian McClelland on September 22, 2018 at 12:30am

Additional comments about 1/2 flap T/O on my 601XLB. 1/2 flap T/O is good for soft field situations or long grass fields. Technique is to hold back quite a lot of stick early on the T/O roll so the nose wheel sits off the ground.  Care and practice is required not to over do it and put the tail on the ground.  My A/C will do this quite easily due to the main gear position (composite legs). The A/C will fly off in this attitude about 30 - 35 kts. Then progressively stick forward to maintain height and accelerate and raise the flap. With out flap the unstick speed is higher (about 40 kts). I still haven't measured distances but there is no doubt its shorter due to the lower unstick speeds. I would not use this technique in a cross wind or a firm surface airfield  - no advantage. I have a Camit 120 HP engine installed so the extra power and marginally lighter weigh Engine compared to the 912 Rotax may also help. 

Comment by Ian McClelland on November 23, 2013 at 12:27am

I need to do some measuring. Will post the results

Comment by Chad Scriver on November 22, 2013 at 4:38am

I find my takeoff roll is MUCH longer with any flap. I can get off (1100lbs) in under 600' flapless, and 800 or greater with flaps. Same results on grass and pavement. I did many variations to see what was best, and flapless got it off faster. Probably did 50 takeoffs this summer just to try different methods. Just my plane maybe? 912S. I found that flaps added too much drag to get her accelerating quick enough on grass.

Comment by Frederick on July 30, 2013 at 9:09am

Take off with half flaps, how many feet for take off?