If you are located at a high altitude, your "Alien Wizard" may not float...
Our airships are designed for operation at moderate elevations. If you are located at a high altitude then it is possible that the balloon of the airship may not be generating enough lift due to the lower density of the surrounding air - this is occassionally an issue with the 'Alien Wizard' saucer-shaped balloon, but not with the other, larger blimps. Click here for more info

If it still doesn't float...
As a last ditch attempt, you can remove some of the plastic from the gondola. Click here for a diagram.

Underinflation or too much ballast...
Try removing the ballast in small increments until you get a positive bouyancy. Don't overdo it though as you will waste battery power forcing the airship down with the altitude control thruster. The airship should be neutrally buoyant or perhaps a very slight tendency to rise.

If adding Helium to the balloon, be careful not to overinflate it as this could cause it to burst. Also, be gentle when inserting the fill hose into the airship's valve - do not insert it too far because you may damage the self-closing seal.

Airship deflating and sinking...
The airships should stay inflated for two weeks or more, before needing to be recharged with Helium. If your airship is deflating too quickly you can try rolling up the valve and taping it with a piece of Scotch-tape to hold it in this furled position. This should minimize any leakage through the valve.

Airship deflating (going flat) but not sinking...
If your airship floats properly but has merely lost a bit of it's blimp-like shape, you can easily fix this without adding more Helium. Simply insert a drinking straw into the inflation valve and gently blow into it. This will pressurize the interior of the blimp without affecting its buoyancy. Again, be careful not to damage the self-sealing valve.