Conversation so far:
What is the H-4 hercules?
HK-1 Hercules flying boat.
What was the use of the flying boat?
use during World War II to transport troops and equipment across the Atlantic as an alternative to seagoing troop transport ships that were vulnerable.
How much did the hercules cost to make?
CANNOTANSWER.
Was the hercules used for many missions?
The Hercules flew only once for one mile (1.6 km), and 70 feet (21 m) above the water, with Hughes at the controls, on November 2, 1947.

Question: Did the boat have many critics?
Self-contained rewrite: Did Howard Hughes' H-4 Hercules boat have many critics?