Orval Fairbairn wrote:

...

The original Baughman Brigadier had conventional wings, with two O-435s
in a pusher arrangement. Custer modified one into his Channel Wing. The
problem, of course was, "What happens if you are in such a slow flight
and an engine quits?"

The VF-173 had a worse potential problem, at any speed. The solution
was to mechanically couple the enginesso that iff one quit whatever
power
remained was still evenly divided bewteen the propellers. I'm not
clear
on why you'd want to engines, unless there were no enignes large
engough to drive both props.

There was also a single engine-prop-channel design.

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FF