gypsywagon wrote:I have been starting with 20 degrees flaps and then when practicing for short field with an obstacle, I do what I think contactflying would say is using zoom reserve to make a large gain in altitude. Greg is absolutely right it creates a lot of drag, but what I do is get into low ground effect, speed up as much as possible (while staying inside the white arc), and then pull in 10-20 degrees more flaps while pitching for 80 mph. As soon as I hit that speed, I level off and return the flaps in a fluid motion never, loosing airspeed but gaining lots of altitude over a very short distance. NOW be aware this is at low density altitudes and low field elevations. The key to this being that I get into low ground effect and trade speed for altitude and using flaps to assist in gaining as much altitude as possible over the short distance.
It does not hurt that its a hell of a lot of fun too.
gypsy
I wasn't going to reply to this thread because I thought adding flaps at the instant your wanting to break ground was a pretty self exaplanatory thing, However this post got me thinking otherwise.
I have never heard of anyone adding flaps AFTER they level off in ground effect. Your technique actually sounds very wrong, but I think it may be the fact we are communicating over a text-only forum. As I read your post, it sounds like:
1. Start TO roll with 20deg flaps
2. Liftoff with 20deg of flaps and stay in low ground effect with 20deg flaps.
3. When you hit top of white arc in low ground effect, increase flaps by 10-20 deg resulting in 30deg-40eg flaps
4. Pitch for 80mph
5. When you hit 80mph, level off and start reducing flaps
This is a very confusing technique to me.