Back Boeing-Vertol 347

Experimental advanced-technology helicopter with stretched CH-47A fuselage, four-blade rotors, taller aft pylon, retractable u/c and lift wing mounted above centre fuselage. Prot. FF 27 May 1970.

R.Simpson "Airlife's Helicopter and Rotorcraft", 1998

Boeing-Vertol 347

This is Boeing Vertol's 347, built to test HLH systems and concepts. A retractable cargo-operator's cockpit facing rearwards was fitted just in front of the forward landing gear.

Richard Pozzi, e-mail, 21.06.2017

Frank DeFelice
Are you still around? If so email me.

graeme mcnay, e-mail, 19.10.2016

Why wasn't it pursued further?

Allan, e-mail, 23.02.2016

Anyone know what the wingspan on the 347 is/ was?


Antonio Mariscal, e-mail, 17.11.2015


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polo, e-mail, 14.06.2011

It brought back a great memory and that means a lot to me. I will send this to my dad now!

Harry Licht, e-mail, 12.04.2010

I attended the factory course for the CH47 at the Boeing Vertol plant, and watched some of the test flights for this aircraft. The wing had already been removed, but they had the 110" cabin extention and were still testing the new blades and the L11 engines. It was quite a site to see I would have loved to have seen it with the wings still attached.

Jimmy Deals, e-mail, 26.09.2008

This airctaft is on display at the Ft. Rucker Aviation Museum.

Jon Good, e-mail, 09.08.2008

I can't belive I finally found a photo of this awesome helicopter! I was there with my step-dad on 27 May 1970, to see it's firat flight: (he was a Boeing-Vertol blade bondsman back then). I was pretty young, but I remember it being quite spectacular! Frank is right; it was quieter than a standard Chinook. If I'm not mistaken, the test pilot even barrel-rolled the enormous machine, which was probably possible because of the added stability of the wings; I'm guessing. I had hoped to see a model 347 again, but I guess it was not to be. Thanks for this site and especially this photo. It brought back a great memory and that means a lot to me. I will send this to my dad now!

Frank DeFelice, e-mail, 07.10.2007

Yep; I was on the Developmental Flight Test crew that built this aircraft (as well as many other Boeing -Vertol products). This ship had it all - four AGB blades on each hub (which became the forerunner of the later std honeycomb Droop Snoot blades); extended fuselage and aft pylon (which greatly reduced the noise signature by separating front and rear blades so they no longer intermeshed); retractable landing gear AND a computer controlled variable angle of attack wing which tested the concepted of "unloading" the rotor blades and high speed engines and drive train. This ship was extremely fast and quiet compared to a standard Chinook and was eons ahead of it's time.

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