U shaped wings

In article
,
Dave wrote:

On Jan 5, 10:49*pm, bildan wrote:
On Jan 5, 8:26*pm, "Æslop" wrote:





"Jim Logajan" wrote in message

. ..

Dan wrote:
Hul Tytus wrote:
rec.aviation.homebuilt
U shaped wings

* *Some time ago there was a magazine cover showing a twin engine
* *aircraft
with a U shape in each wing. The U's curved downward then up again
with engines and props within the U.
* *When did that occur and what magazine was that; anyone know? A
* *vague memory
points to popular mechanics or popular science.

Hul

* * Custer channel wing?

My thought also. Here are some links:

http://www.custerchannelwing.com/

http://www.youtube.com/watch?v=-Sn5JL9t_C4

I would think that an engine out on takeoff would be about 100% fatal.
Such
a huge difference in lift would cause an immediate wing over and spin.

It's essentially a "blown wing" or "powered lift" aircraft. *The only
way it would be even remotely safe is to link the props with a cross
shaft with Sprague clutches somewhat like the V-22 Osprey. *That way
if one engine failed, both props continue to be powered. *Even then it
could only be justified for special missions that needed the STOL
capability badly.

However, a single engine channel wing is possible.

Not exactly a Channel Wing, but this plane is a fully ducted wing
single: http://www.optica.co.uk/

Dave

I don't think that it got the blown lift effect that the Custer did. The
problems with the Custer arose with low speed controllability and
asymmetric lift at very low speeds if an engine failed on the twin.

Even the single would have similar problems if the engine fails at very
low speed, as the plane would now be well below stall speed.

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