Only the bare machinery was in her, as yet, and the gas bag had not been inflated as Tom wanted to try the plane feature first. But the vapor machine was all ready to start generating the gas whenever it was needed. Nor was the Black Hawk painted and decorated as she would be when ready to be sent to Africa. On the whole, she looked rather crude as she rested there on the bicycle wheels, awaiting the starting of the big propellers. As the stores and supplies were not yet in, Tom took aboard, in addition to Mr. Damon, Ned, his father, Mr. Jackson and Mr. Durban, some bags of sand to represent the extra weight that would have to be carried. "If she'll rise with this load she'll do," announced the young inventor, as he went carefully over the craft, looking to see that everything was in shape. "If she does rise it will be a new experience for me," spoke the old elephant hunter. "I've never been in an airship before. It doesn't seem possible that we can get up in the air with this machine." "Maybe we won't," spoke Tom, who was always a little diffident about a new piece of machinery. "Well, if it doesn't do it the first time, it will the second, or the fifty-second," declared Ned Newton. "Tom Swift doesn't give up until he succeeds." "Stop it! You'll make me blush!" cried the Black Hawk's owner as he tried the different gages and levers to see that they were all right. After what seemed like a long time he gave the word for those who were to make the trial trip to take their places. They did so, and then, with Mr. Jackson, Tom went to the engine room. There was a little delay, due to the fact that some adjustment was necessary on the main motor. But at last it was fixed. "Are you all ready?" called Tom. "All ready," answered Mr. Damon. The old elephant hunter sat in a chair, nervously gripping the arms, and with a grim look on his tanned face. Mr. Swift was cool, as Ned, for they had made many trips in the air. Outside were Eradicate Sampson and Mrs. Baggert. "Here we go!" suddenly cried Tom, and he yanked over the lever that started the main motor and propellers. The Black Hawk trembled throughout her entire length. She shivered and shook. Faster and faster whirled the great wooden screws. The motor hummed and throbbed. Slowly the Black Hawk moved across the ground. Then she gathered speed. Now she was fairly rushing over the level space. Tom Swift tilted the elevation rudder, and with a suddenness that was startling, at least to the old elephant hunter, the new airship shot upward on a steep slant. "The Black Hawk flies!" yelled Ned Newton. "Now for elephant land and the big tusks!" "Yes, and perhaps for the red pygmies, too," added Tom in a low voice. Then he gave his whole attention to the management of his new machine, which was rapidly mounting upward, with a speed rivalling that of his former big craft. CHAPTER VIII OFF FOR AFRICA