"Little more speed, Frank," called Jack.
The hydroplane skimmed through the air faster than before and the next German craft did not overtake it so easily; but at length it passed, as did a third and a fourth.
"Here's a good place for us to fall in line," Jack instructed.
Again Frank increased the speed of the hydroplane and it moved swiftly in the wake of the fourth German craft. After that no enemy air plane passed them.
"Any idea where we are?" asked Frank of his chum.
"We're not far off the Belgian coast, but how far west I can't say," returned Jack. "Don't suppose it makes any particular difference, though."
"I guess not."
Frank became silent and gave his undivided attention to keeping the
German plane ahead of him in sight.
And in this manner they proceeded for perhaps another half hour.
Then the machine ahead of Frank veered sharply to the south. Frank brought the head of his own craft in the same direction and the flight continued.