Soviet X14 Ultralight

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GlassVampire

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Came across this "vintage" ultralight today. Anyone else ever heard of it? Seems like an interesting design, thought at first glance I'd say the wings are WAYYYYYYYYYYY to small to actually fly supporting a person. Though with a big enough engine and going fast enough I suppose it may be possible.

Some Basic Specs:
Engine 42 hp Propeller 2-blade wooden fixed 3,3 ft dia Landing gear trigear Length 10,76 ft Wing Span 17,2 ft Wing Area 21,1 sq.ftEmpty Weight 100 lb Gross Weight 277 lb Wing Loading 13,2 lb / sq.ft Power Loading 6,59 lb / hp Fuel Capacity n.a. Top Speed 80 mph Stall Speed 26 mphBldg. Materials Wing: wood, fabric, composite
Tail: wood, fabric, composite
Fuselage: tubing




x14_ultralight_aircraft.jpg x143dview.jpg

Source link: X-14 - Soviet Homebuilt Ultralight & Aircraft directory

Thoughts?? :lick:
 

PTAirco

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I have seen stories about this one a long time ago. I seem to remember the whole thing folded up into two suitcases.

The wings I remember seemed to look like a double or even triple slotted flaps and they would have to be, to work with such a minute wing area. 13 lb/sf wingloading?

And the pilot seems to block most of the air flowing into the propeller, yet I heard this thing actually flew, though I have sen no picture of it.
 

GlassVampire

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Ah thanks for the link Orion. That be sweet to have a plane that could fold into two suitcases...talk about a bond gadget. Not even "Little Nellie" could do that (Though I'd love to have a gyrocopter ) :p
 

Robby

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Um, I'm not real sure but does that guy in the first picture look like he's holding up
100 lbs ??? !!!! ( the empty weight of the 'aircraft' ) Look at the posture.

Not to me.

And, according to the specs on the link, a 42 HP engine about the size of a basketball ?? !!

I swear, if this was a bit older, and, since it IS coming out of the Soviet Union, I'd call it another piece of one of their MANY mis-information campaigns !!!!! :ban:

In any case, if it exists or existed, it's never going to flown or even attempt to be flown using my alabaster body !!!!!! ( I don't bounce and heal as well as I used to !! ) :ponder:
 

Topaz

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As I understand it, it did break ground, but really couldn't get much out of ground-effect. If you search for "X14" or "X-14" here, you'll find a thread where Orion discusses some of the shortcomings. Apparently he was contacted by someone wanting to bring the design here to the USA.

>>> Edit. Sorry, Orion already referenced that thread above. Here's the permalink to his post: https://www.homebuiltairplanes.com/forums/light-stuff-area/455-small-portable-plane.html#post1876 <<<
 

Bart

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What ~13 lb./SF loaded airfoil starts flying at ~26 mph?

As for the airflow to the prop being buggered by the pilot's draggy shape, maybe some sorta inflatable fairing could be made, which would serve simultaneously as an airbag to protect the pilot in crashes, a very handy feature for such a design.
 

orion

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One of the problems this plane had was its use of a fairly complicated system of flaps (double slotted), drooping ailerons and leading edge slats, much of which was partially deployed on takeoff. I think I recall someone saying that the 26 mph was optimistic but it did fly (although only a couple of times and hardly out of ground effect). No one knew however whether flights were that limited due to the pilot's caution (fear?) or they simply didn't want to get shot at by the Russian authorities (fear again?).
 

GlassVampire

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Some of the above comments were pretty humorous. I've always been interested in a minimum-size, capable ultralight. Kind of like the Cri-Cri, I'd build one of those except it wouldn't fall into the UL catagory.
 

Bart

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There may be other ways to skin the cat and still have a plane of that weight and basic dimensions, which would still dis-assemble and fit into the same size containers.

Maybe increase wing cord somewhat for lower wing loading/SF, with wing and tail feather panels that nestle together in the bag like Russian dolls? Telescoping centerline keel and basic planform like Strojnik S2? Inflatable cockpit pod? Centerline bicycle landing gear? Telescoping wing struts rather than drag wires? Shrouded prop?

Going a different route, what if Gtex09's lifting body ideas could be scaled down and combined with semi-rigid skin and inflation stiffening?
 

J.L. Frusha

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Another member on here has it and the rights. It's a back-burner project, while he works on a design he wants to sell commercially...
 

aerogant

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I think that development is still continuing on these planes. I found two stories that seem a bit more up to date.

Russia-InfoCentre :: Very Light Aircraft – Almost Like a Feather :: Sounds Like A Breakthrough :: Education & Science

Google Translate

One thing that has always puzzled me has been the claims of high lift. It was my understanding that short chord, low RN airfoils could not produce the kind of lift that this plane would need. I would greatly welcome any insight along those lines.
 

autoreply

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One thing that has always puzzled me has been the claims of high lift. It was my understanding that short chord, low RN airfoils could not produce the kind of lift that this plane would need. I would greatly welcome any insight along those lines.
Marketing, like those "STOL-aircraft", they claimed to stall at 20 mph (with a CLmax of 12 or so)
onzin.jpg
2 for such a tiny wing is achievable. 3 is about the highest you will ever get, maybe a tad more in ground effect (where VSo isn't defined). 40 mph would be believable. 26 mph? Not for me.
 

lurker

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J.L. Frusha

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He sold his x-14 to an American, along with the rights. The American is a member of this forum and is working on another project, before he can get to the x-14.
 
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