"All right, we'll enter all our machines," said Roy; "let us go into the writing room and we'll sign the entry blanks."

"Good for you," cried the mayor delightedly; "you'll be a big drawing card, especially the young ladies. I never heard of gals flyin', although, come to think of it, why shouldn't they?"

In the writing room they concluded the business. When it was done all the machines had been entered in every contest, including an altitude one.

"We start at ten sharp, so be there," admonished the mayor as he departed, highly pleased at having secured quite a flock of young aviators at no cost at all.

It was as his figure vanished, that Lish Kelly crossed the writing room. He had been sitting in a telephone booth, and leaving the door a crack open had heard every word that had passed.

He greeted the boys with an angry scowl.

"So you ain't going to stay out?" he said gruffly, as he passed. "All right; look out for squalls!"

[!-- CH17 --]

CHAPTER XVII.

THE TWISTED SPARK PLUG.