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Borrowed from the Dundee Model Aircraft Club
The Humpty Bump is a rather bizarre name for one of the most useful and versatile aerobatic maneuvers around.
It can be used on the centerline of a display box or at either end and can remain inthe display plane or shift the model inwards or outwards - cross-box.
At it's most basic, the Humpty Bump consists of a quarter loop into the vertical. On the way up, the model is half rolled. A half loop at the top results in the model coming vertically down where a half roll is executed followed by a quarter loop to pull out. The quarter loops should be the same radii but do not have to be the same as the top half loop. You can also do two quarter rolls on the way up and down for the same effect.
This is where it starts to get interesting!. Omit the downwards half roll and you have a straightforward turnaround maneuver.
The next step is to replace the half rolls with quarter rolls. If you do this, you will force the model outwards or inwards. The quarter rolls should be in opposite directions. If the first quarter roll had been to the right, instead of to the left as shown, the top of this humpty bump would would be a "push over the top" - a half bunt - instead of a half loop.
Similarly, you can initially quarter roll the opposite way on the way up to bring the model closer in.
These are just four of the many basic variations of the Humpty Bump. There are many variations of these depending on the choice of quarter roll diections. Experiment yourself and see just how versatile this maneuver is for inline and cross box manouevring. You can even do a turnaround crossbox maneuver where the model recovers upside down - simply do the two quarter rolls in the same direction.
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