Tom Swift and His Air Glider

Well, Ned, are you ready? "Oh, I suppose so, Tom. As ready as I ever shall be." "Why, Ned Newton, you're not getting afraid; are you? And after you've been on so many trips with me?" "No, it isn't exactly that, Tom. I'd go in a minute if you didn't have this new fangled thing on your airship. But how do you know how it's going to work—or whether it will work at all? We may come a cropper."