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The pupil must learn also, and this again is important, not to force his machine round on a turn while it is climbing. If he does so the power absorbed in the ascent, combined with the resistance of the turn, may so reduce the speed of the machine that it threatens to become "stalled," or reach a standstill in the air, with the result that it either side-slips or falls tail-first.

They left the hotel, ushered on their way by bowing boy sans; and in a few minutes an unsteady motor-car, careless of obstacles and side-slips, had whirled them through the slushy streets into the British compound, which only wanted a robin to look like the conventional Christmas card.

In many cases side-slips have taken place at aerodromes when the pilot has been rounding a pylon with the nose of his machine pointing upwards. When a machine flies round a corner very quickly the pilot tilts it to one side. Such action as this is known as BANKING. This operation can be witnessed at any aerodrome when speed handicaps are taking place.

His experience as a fighting aviator in France had made Hippy somewhat callous to bullets, as well as an expert in ducking. In the present instance, Lieutenant Wingate made so many ducks and dives, side-slips and Immelman turns that the mountaineer, crack shot that he was, found himself unable to score a hit. The darkness, too, prevented his getting a good sight at the man he was trying to shoot.

Sometimes an axle breaks, or a waggon side-slips off the pavé into the morass reserved for infantry, and overturns. The result is a block, which promptly extends forward and back for a couple of miles.

What was the matter with this bus, anyway, that made them decide to shelve her?" Someone told me that she side-slips badly at times. I never heard why. Planes don't do things like that without there being a reason, Louis. Maybe she needs a bit of fixing that she has never had. It would be fun if we could rig her up so that she would fly properly, wouldn't it?

The fight is going badly for the bold fighting machine, when suddenly like a hawk, Tam o' the Scoots sweeps upon his prey. One of the enemy side-slips, dives and streaks to the earth, leaving a cloud of smoke to mark his unsubstantial path. As for the others, they bank over and go home. One falls in spirals within the enemy's lines. Rescuer and rescued land together.