Do blimps show up on radar? And if so, could somebody explain why? Is it the material they are made from (mylar/nylon)? Is it that their low density somehow gives an odd reflection?
What's the bet that blimps are similarly equipped?
would also depend on what else on the blimp was made of metal.... the cockpit, passenger area, the engines etc....
There's sure to be some reflections, but they wouldnt really give a good indication of the full size.
On another thought train tho .....
rain ... which is of course not metallic, reflects radar quiet easily. Us amateur radio operators use a number of microwave radio frequencies to do what is called rainscatter communications.
One wonders if a rain wet blimp would reflect radar easier/more efficiently than a dry one ?