“Call Koku!” gasped Tom.  “If anybody can budge it the giant can!”

Meanwhile the airship was being carried onward in the grip of a mighty wind, so strong that its pressure on the surface of the deflecting rudder prevented it from being shifted.

CHAPTER XV — SNAPPING AN AVALANCHE

“Bless my thermometer!” gasped Mr. Damon.  “This is terrible!” The airship was plunging and swaying about in the awful gale.  “Can’t something be done, Tom?”

“What has happened?” cried Mr. Nestor.  “We were on a level keel before.  What is it?”

“It’s the automatic balancing rudder!” answered Tom.  “Something has happened to it.  The wind may have broken it!  Come on, Ned!” and he led the way to the engine room.

“What are you going to do?  Don’t you want Koku to shift the deflecting rudder?  Here he is,” Ned added, as the giant came forward, in response to a signal bell that Tom’s chum had rung.

“It’s too late to try the deflecting rudder!” tried Tom.  “I must see what is the matter with our balancer.”  As he spoke the ship gave a terrific plunge, and the occupants were thrown sideways.  The next moment it was on a level keel again, scudding along with the gale, but there was no telling when the craft would again nearly capsize.

Tom looked at the mechanism controlling the equalizing and equilibrium rudder.  It was out of order, and he guessed that the terrific wind was responsible for it.

“What can we do?” cried Ned, as the airship nearly rolled over.  “Can’t we do anything, Tom?”

“Yes.  I’m going to try.  Keep calm now.  We may come out all right.  This is the worst blow we’ve been in since we were in Russia.  Start the gas machine full blast.  I want all the vapor I can get.”

As I have explained the Flyer was a combined dirigible balloon and aeroplane.  It could be used as either, or both, in combination.  At present the gas bag was not fully inflated, and Tom had been sending his craft along as an aeroplane.

“What are you going to do?” cried Ned, as he pulled over the lever that set the gas generating machine in operation.

“I’m going up as high as I can go!” cried Tom.  “If we can’t go down we must go up.  I’ll get above the hurricane instead of below it.  Give me all the gas you can, Ned!”

The vapor hissed as it rushed into the big bag overhead.  Tom carried aboard his craft the chemicals needed to generate the powerful lifting gas, of which he alone had the secret.  It was more powerful than hydrogen, and simple to make.  The balloon of the Flyer was now being distended.

Meanwhile Tom, with Koku, Mr. Damon and Mr. Nestor to help him, worked over the deflecting rudder, and also on the equilibrium mechanism.  But they could not get either to operate.

Ned stood by the gas machine, and worked it to the limit.  But even with all that energy, so powerful was the wind, that the Flyer rose slowly, the gale actually holding her down as a water-logged craft is held below the waves.  Ordinarily, with the gas machine set at its limit the craft would have shot up rapidly.