Will the Japanese make drone fire engines to cool the reactors?

Question:

Surely with all the robot know how they have it couldn't be that difficult..

Answer:

You have a good point, as the pilots of crew of the helicopters dropping water onto the exposed rods are putting their lives at risk from radiation poisoning. By definition, they have to be directly above them to release the water in the right place.
With this emergency, we have all learnt of the Milli-Sieverts index of radiation. From Chernobyl, I remember Bequerel being the unit.