what is the computer stabilizing technology for F-117? is it possible to make small computer for craft toy plane ?


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Grathio7 years ago
No, the stabilization for a f-117 is not available for hobby use.

There are computerized autopilots that you can build and modify yourself. example.
zmei4o (author) 6 years ago
if my model is 3-4meters is that hobby model ? :))))
and if you are noticed the shape ot F-117 is not common :P
that`s why i need better stabilization for non common models ;)
seandogue7 years ago
The algorithms used to stabilize the F117 are far beyond hobby use.
zmei4o (author)  seandogue7 years ago
i need reasonable answers ;)
Nyxius zmei4o7 years ago
I am the hardware team leader for the OSU aerial robotics club. If you are looking to stabilize a hobby scale plane try the GumStix computing platform.  Very small computer, but more than enough for what you need.   As far as control algorithms go...  That depends very heavily on the type of plane you are trying to fly.  There is a lot of math that goes into a flight model, but if is definitely within the reach of hobbyists (dedicated hobbyists).

Suggestions: a multichannel neural feedback loop is probably this simplest way to stabilize it.  Downside: possibility of several crashes before getting it right.  There are a lot of publicly available papers on the subject.  There is also a lot of hobby groups dedicated to just this sort of thing.  i.e. DIYdrones.com

These guys can help you out with more questions.
Well, fortunately for you, someone ele posted what you *wanted.
Far beyond hobby use? Perhaps. I think it all depends on one's dedication to the hobby.
;-)




lol... Building a scale model of a plane doesn't mean it uses military algorithms, regardless of how much cash someone throws at it.

(and btw, that's not an F117, that's a model of one of 60 or so SR-71 Blackbirds, which is now an obsolete reconnaissance plane ... and has been for a decade or more)

And for the record, the real SR-71 did not use anywhere near the level of sophistication in internal coding as is required to fly an F117 or it's big brother bomber (or the latest generation fighters)...or any number of other SOA military systems.

far far far beyond hobbyists. At the point which someone is employing that level of sophistication, they are not just pouring the money into a hobby but are looking for a mercantile return thru contracts with the military or some other space/aviation concern.

JFYI
The SR-71 was one of the first aircraft to use computer control of anysort. The engine, at full speed relied on a shock wave being presented just so at the engine inlet - boy it was REALLY fantastically clever engineering. Unfortunately sometimes the wave would blow out. Skunkworks engineers devised an analogue computer that would handle keeping the special shockwave spike in the right position. I think it became digital in the end.

As far as we know, SR-71 is the fastest aircraft to ever fly.
.  I had a roommate who was an Avionics Tech on SR-71's. Every time I'd ask him a question about the bird, he'd reply "If I tell ya, I'll have to kill ya." heehee
Last time I was in Tucson, we did the Pima air museum, where they have THE most beautiful aircraft ever built on display, with its start-cart and other accessories. The bookstore there had some great books, and I have Ben E. Rich, the chief engineers book too - that's where the tale of the shockwave came from.

Amazing aircraft, unbeaten, untouchable. Unflyable :-((

Steve
CameronSS7 years ago
You likely won't find the stabilization computers for an F-117 scaled down for an R/C model, but electronic stabilization is cheaper than you might think. Some R/C trainers have an autopilot that is always on, but slaved to the remote, so that if you simply release the controls, it will return to straight-and-level flight. More commonly, R/C helicopters generally have a piezoelectric gyroscope coupled to the tail rotor, which prevents unwanted yaw motion, and takes care of one of the many motions a beginning pilot has to learn to correct for. There is a nice FAQ page about R/C gyros on the Futaba web site.
Tell me, what is a "military algorithm", and how is it different from the algorithms used by civilian programmers and engineers?  Are the computers or microcontrollers that the military uses fundamentally different than those used in civilian applications;  e.g controlling the spark-timing and fuel-metering in a mini-van, or color balance in a digital camera?    Is the language in which the programs are written different:  a super-language for military applications, and ordinary, ho-hum, boring computer languages for civilian apps?

All I'm saying is that control systems for hobby applications may not be as difficult, inaccessible, or impossible, as you think.

BTW, the video link was intended simply as evidence that people are willing to pour money and time into the hobby of RC planes.  I do not claim that the pictured model aircraft has any of the hypothetical control systems I describe.  Supposedly it wouldn't need them, because the shape of the SR-71 is/was one that is aerodynamically stable already. Blah. Blah. Blah. I think you get the idea. Maybe...
The problem of stabilizing the F-117 is one of many from the field of control theory, which is the engineering solution to the science of dynamics. Some links:
http://en.wikipedia.org/wiki/Control_theory
http://en.wikipedia.org/wiki/Dynamical_system
http://en.wikipedia.org/wiki/Dynamics

The trick to this is of course, feedback, based on outputs from your sensors, and a mathematical model of the dynamics of the system you are trying to control.

500px-Feedback_loop_with_descriptions.svg.png
Re-design7 years ago
There are now available to just plug into the receiver and autopilot for r/c planes.  I don't know if it would fly a model F-117 or not though.