“Good luck!” he called to her as he was adjusting his timer, for his turn would come soon.  “Remember what I told you about the spark,” for he had given her a few lessons.

“If I win it will be due to you,” she called brightly.

She did win, coming in ahead of several confident lads who had better boats.  But Miss Nestor handled the Dot to perfection and crossed the line a boat’s length ahead of her nearest competitor.

“Fine!” cried Tom, and then came the warning gun that told him to get ready for his trial.

This was a five-mile race and had several entrants.  The affair was a handicap one and Tom had no reason to complain of the rating allowed him.

“Crack!” went the starting pistol and away went Tom and one or two others who had the same allowance as did he.  A little later the others started and finally the last class, including Andy Foger.  The red streak shot ahead and was soon in the lead, for Andy and Sam had learned better how to handle their craft.  Tom and Mr. Sharp were worried, but they stuck grimly to the race and when the turning stake was reached Tom’s motor had so warmed up and was running so well that he crept up on Andy.  A mile from the final mark Andy and Tom were on even terms, and though the red-haired lad tried to shake off his rival he could not.  Andy’s ignition system failed him several times and he changed from batteries to magneto and back again in the hope of getting a little more speed out of the motor.

But it was not to be.  A half-mile away from the finish Tom, who had fallen behind a little, crept up on even terms.  Then he slowly forged ahead, and, a hundred rods from the stake, the young inventor knew that the race was his.  He clinched it a few minutes later, crossing the line amid a burst of cheers.  The arrow had beaten several boats out of her own class and Tom was very proud and happy.

“My, but we certainly did scoot along some!” cried Mr. Sharp.  “But that’s nothing to how we’ll go when we build our airship, eh, Tom?” and he looked at the flushed face of the lad.

“No, indeed,” agreed the young inventor.  “But I don’t know that we’ll take part in any races in it.  We’ll build it, however, as soon as we can solve that one difficulty.”

They did solve it, as will be told in the next book of this series, to be called “Tom Swift and His Airship; or, The Stirring Cruise of the red cloud.”  They had some remarkable adventures in the wonderful craft, and solved the mystery of a great bank robbery.

This ended the contests of the motor-boats and the little fleet crowded up to the floats and docks, where the prizes were to be awarded.  Tom received a handsome silver cup and Miss Nestor a gold bracelet.

“Now I want all the contestants, winners and losers, to come up to my house and have lunch,” invited Mr. Hastings.

As Tom and the balloonist strolled up the walk to the handsome house Andy Foger passed them.