In article , Stormin' Norman says...

On 2 Jun 2018 06:29:31 -0700, Miloch
wrote:


One of my all time favorite aircraft!

I was fascinated by this part of the design history:

"In this arrangement both propellers would turn upward as they
approached the center wing, which in theory would have allowed better
single-engine control. This proved not to be the case when the
aircraft refused to become airborne during its first flight attempt.
After a month of work North American engineers finally discovered that
rotating the propellers to meet in the center on their upward turn
created sufficient drag to cancel out all lift from the center wing
section, one quarter of the aircraft's total wing surface area. The
engines and propellers were then exchanged, with their rotation
meeting on the downward turn, and the problem was fully solved."

The engineers responsible must have all breathed a giant sigh of
relief!



I posted 18 images but only show 3 on my side...hope all 18 made it up.

I'll repost them all if the consensus is no one got more than 3



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