"Wonder who that man is who is monkeying with the Red Dragon?" said Peggy, the next instant. "I mean that horrid looking man in the check suit."
"I don't know. See, he has a monkey wrench in his hand, too," exclaimed Bess.
Almost simultaneously the boys looked round from their work on the biplane and saw the man. It was Lish Kelly. He was bending over the engine and doing something to it with his wrench.
"Hey! What are you doing there?" yelled Roy.
"Just looking at your machine. No harm in that, is there?" demanded Kelly, with a red face.
"None at all, except that we don't want our machines touched. How comes it you have that monkey wrench in your hands if you weren't tampering with the machinery?"
Jimsy spoke in a voice that fairly bubbled over with indignation.
"Don't get sore, kid; I wouldn't harm your old mowing machine. There isn't one of mine but could beat it the fastest day it ever flew."
As he spoke Kelly slouched off. They saw him go up to a group of his aviators and begin talking earnestly to them. Once or twice he motioned with his head in their direction.
"So he does mean mischief, after all," said Roy; "let's take a good look at the Dragon's engine. He may have injured it, although I don't think he'd have had time to hurt it seriously."