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If the Dragon is a perfect cylinder, and 120' long (about 40m), if the 50 ton mass (50,000,000g) would give a linear weight requirement of 50,000,000g/4,000cm, or 12,500g/cm.
If we assign dragon and arbitrary density of water, this would give each 1cm thick dragon slice a mass of 12.5kg - which would equate to a cross sectional area of 12,500cm^2.
Using simple geometry, we know that area of a circle is pi*r^2, so r^2=a/pi. r^2 = 3979cm^2, so r = 63cm.
Somehow, I don't think "lifting gas" is the answer.
Maybe they're like helicopters? They're just so damned ugly that the ground repels them.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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