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I had this question: Could this helicopter's body be a flying wing? and this picture came up.

What kind of helicopter is this? What is the extra wing for?

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    $\begingroup$ That's just Boeing trying to decide whether to build a plane or a chopper next. $\endgroup$ – Mast Jul 7 at 18:29
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    $\begingroup$ @Mast The project was abandoned because the marketing department just couldn't do anything with "plopper". $\endgroup$ – David Richerby Jul 7 at 19:34
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    $\begingroup$ @DavidRicherby ... thanks now I have Arnie yelling "Get to the plopper!" stuck in my head. $\endgroup$ – Jon P Jul 8 at 1:04
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It‘s a BV-347 technology demonstrator:

In 1969, the Army and then-Boeing Vertol entered into a partnership to improve upon their cargo helicopter fleet, and thus the BV-347 was borne from a CH-47A Chinook that was provided by the Army as a technology demonstrator, according to retired CW5 Jim Kale, who now serves as a tour guide for the U.S. Army Aviation Museum.

Primary objectives as found in above article:

The BV-347 was tested for more than two years and flew about 350 hours with the intention to meet five primary goals: improve flying qualities with external loads and instrument flight; im-prove stability, control and maneuverability in hover flight and forward flight with high gross weight; reduce rotor noise; reduce vibration stress; and create a modern cockpit environment with improved instrument and navigation displays.

The wing was intended to provide extra lift (works in forward flight only, of course), but apparently didn’t add net benefit:

The wings were added as a means to improve lift, and although the addition served its purpose, the added weight canceled out any positive effects it provided [...].

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