"So I noticed," returned her young instructor rather grimly. "Carelessness, you know, that's all. Keep your mind on the job. And here's something else. Remember, when you are making a flipper turn, the nose must first be dropped to level. Otherwise you'll get into serious trouble. Also don't forget that until the wings pass an angle of bank of 45 degrees your controls are not inverted and must be handled as in a normal turn."
"O.K. skipper," she sighed. "I'll remember in future."
"One thing more. Those two 360-degree spirals with an altitude loss of about 1000 feet were well done. But you must bring your plane out of reverse control spirals above 1500 feet altitude--Now we'll put your bus away and call it a day."
Work finished, they strolled over to the terrace where Frank as usual had iced drinks awaiting them.
"You've certainly taught me a lot in fourteen days," observed Dorothy after sipping her ginger ale. "But it's kind of put a crimp into our detective work. By the way, you never have told me what you had up your sleeve with regard to the robbery--something to do with an airplane coming in handy, wasn't it?"
"Your memory is better on the ground than in the air!"
"Pish! likewise, tush! You don't intend to wait till I finish training or anything like that, before coming across with that clue that will help us land those birds in jail?"
"Why should I?"
"I don't know. Thought maybe you might figure my interest in landing the gang would take my mind off flying--"
Bill took a long, refreshing drink of the iced liquid at his elbow. "You're on the wrong track. I'm simply biding my time and keeping a finger on the pulse of the robbery, as it were."