What a sensation of relief that hum of the faithful little Kincaid engine brought in its train, as it once more took up the burden of its busy song. Why, it seemed to Andy as though he could almost shout in sudden relief, when he heard it first, and saw the water flying from the partly submerged propeller.
But Frank was wise enough not to turn on full speed, knowing what a terrific strain this condition of affairs must be upon the entire fabric, flimsy at best; and if anything gave way it was all over with them; for if a chain is only as strong as its weakest link, a heavier-than-air flying machine certainly comes under the same category.
"We're going it, Frank!" shouted Andy, when he saw that their speed had increased several hundred per cent, and that they were now heading straight for the partly submerged air navigators.
It never occurred to Andy that either of the men might offer the slightest objection to being rescued. Frank looked a little further ahead; but even he could hardly believe that Casper Blue would prefer to drown rather than be saved.
What Frank was really concerning himself about more than anything else was how he could stow away the two fellows, once they found a chance to climb aboard the hydroplane; and whether he could get enough impetus from the engine with such an unusual load, to rise from the water, once he elevated his planes.
"Hurry! oh! Hurry! I'm going down!" cried the larger man.
Casper never said a word. Possibly, being a swimmer, he did not feel the same degree of terror that his companion experienced. Then again, he may have been coolly figuring on how he might turn the rescue to his own advantage in some way; for he seemed to have that little black box slung over his back by means of the strap; and it was easy to understand that it must, as Andy had guessed, contain something of considerable more value than a mere camera.
Now they were closing in. The hydroplane round-up was being carried out in what seemed to be a successful manner; and if all went well during the next few minutes the drifting fugitives would be hauled aboard by Andy, who stood ready to act the part of gallant rescuer to the king's taste.
It happened by mere accident that they were on that side of the sinking wreck where the larger man clung; and this was just as it should have been, since he seemed more in need of help, at least in far greater distress of mind, than the smaller man.
"Get ready, Andy!" warned the pilot; "I'll shut off the power if it seems best; but it may keep us on a more even keel if we move along."