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Grumman G-674 "Nutcracker" folding-fuselage VTOL fighter concept

flateric

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PopSci cover
 

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flateric

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finally Grumman Nutcracker 3-view
second image from Air Pictorial via 'Barrington Bond'
 

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chuck4

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What is the point? Why not pivot the whole airplane and save the weight of the hinges?
 

Madurai

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chuck4 said:
What is the point? Why not pivot the whole airplane and save the weight of the hinges?
A wealth of bad experience from all the tailsitter VTOL prototypes, presumably.
 

Triton

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Aviation Week & Space Technology September 20, 1976 pp. 16-17
Aviation Week & Space Technology September 20, 1976 pp. 18-19
Aviation Week & Space Technology September 20, 1976 p. 15
Aviation Week & Space Technology March 01, 1976 p. 12
 

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Foo Fighter

I came, I saw, I drank some tea (and had a bun).
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Bear with me for a moment but, how on earth can that ever work? Can anyone demonstrate the process? Not wanting to be funny or nasty but I cannot see that system ever working.
 

allysonca

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Awwwww, it's so silly that it's cool and makes for a great model.
 

Sundog

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Bear with me for a moment but, how on earth can that ever work? Can anyone demonstrate the process? Not wanting to be funny or nasty but I cannot see that system ever working.
It works by maintaining the thrust vector through the center of mass.
 

Foo Fighter

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How can the thing take off and land vertically with a bendy fuselage and the undercarriage where it is in those pictures? I cannot see it being a starter even. Sorry.
 

Richard N

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During the JSF competition, a lot of people outside of Lockheed Martin said the lift fan/gimbaled nozzle VTOL system would never work (before it did).

The sky is falling types always come out of the woodwork when someone is trying to do something new. Opinions from those outside the programs are usually just wrong.
 

TomcatViP

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I think you land the front oleo on the reduced size platform and while the rear fuselage unfold and you transit forward, you apply the brake once the landing gear is firmly on the ground until the rear fuselage as leveled out.

That's not the most simple landing to describe but it looks as fairly in on single move.
 

Tailspin Turtle

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The airplane hooks into the probe first. Then the landing platform is raised up so the nose landing gear rests on it. Note that its aft section is initially hinged downward like the aft fuselage so the main landing gear can touch it. The aft section of the platform is then pivoted to horizontal as the aft fuselage pivots up to horizontal. Presumably the main landing gear wheels are somehow restrained to the hinged platform when it is vertical so the engines can be shut down while it is raised (the patent application was a little vague in that regard).

Nutcracker Landing.png

Also see https://patents.google.com/patent/US3966142A/en
 
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