Models 145 and 146
with the speed and bombload of the B-10,
Air Corps procurement officials now wanted
longer range. Two competitions were held
in 1934-35: one for several hundred fast
bombers capable of flying 2,200 miles, and
a second for the experimental prototype
of a 5,000-mile bomber.
Martin 146 was built for the first competition.
As the photos show, it bore a striking resemblance
to a B-10, with the same bumpy outline of
turret and cockpits and even the same two
Wright Cyclone engines - hardly positive
selling points for a customer looking for
the latest technology.
Boeing also outclassed Martin in the design
competition for the 5,000-mile bomber.
This time Martin's designers were more adventurous.
The final design for Model 145 had six Allison V-1710's, two tractors and
two pushers, and two more tractor radial
engines, built into a giant 173-foot "flying wing,".