We used stabilators on the F-15. It gave roll control at supersonic conditions when flexibility got to the ailerons and added roll control subsonically. There were schedules of control deflection with angle of attack and elevator input of course. With the stabilator, when the airplane is at large angle of attack, you can still retain control effectiveness. Think of an angle of attack of 25 degrees. Say it requires a pitch control input from the stabilator of 30 degrees leading edge down. That puts the stabilator at aabout a negative 5 degrees relative to the actual flow field (of course this is modified by the downwash term). The roll control available is maintained even at the large deflections.

For use in a fun fly it would work well if you get the mechanism worked out OK and if you can separate the two surfaces like the F-15 so that you have some good moment arms to work with. On a skinny fuselage there would be less rolling moment but it still would work. With one servo on each surface and transmitter mixing you could make it work fine.

hmmm.

A control surface on a 3-D or fun fly must work at 0 mph. It must be a propblast deflector. Hinged surfaces are more effective at this.

I am grateful also,
We, England and USA, won for allot of reasons and a full flying stab was not one of them
just to name a few, English Radar, Merlin engines, production germany could not touch, fuel, Russian winter, ball bearings, it's all ball bearings you know
Einstein was a German defector, so were major players in the Manhattan Project.
Thank goodness Hitler was such a tyrant that they left Germany, all kidding aside
Both of my grandfathers served and i'm proud of them
I'm not trying to insult anybody and i dont want to start WW3
Back on topic
more on what Ben is talking about, lots of radios have this feature, on my 8uaf its called ALVATR it mixes ailerons and indipendant elevator servos together i used it once on a PQHOR SPAD that i wanted to roll faster, it worked well. and would be great on a 3D ship, but it doesnt have to be full flying

Paul - The CLdeltaflap has to approach the CLdeltastabilator as the flap chord goes to 100 percent. Between 0 and 100% flap chord isn't it going to be some non-linear curve with the max value at 100% chord? If so I can't follow/don't understand your comment.

this might be a little off topic sorry but I couldn't resist. the very first full size plane to use these stabilators (SP?) was the X-I can't remember the number in the late 40's early 50's to break the sounds barrier. when they used conventional control surfaces and reach 600 mph they almost broke the sound barrier but it buffeted the plane horribly because the plane was flying just under the speed of sound. this screwed up airflow really badly so they used stabilators to increase the the ammount of control they had on the elevators since these were the most important when flying straight at the ground.

You need to go do your research. The advantage of the stab for supersonic flight was discovered on the X-1, although it used a hinged elevator. The stab was not invented for the X-1. The whole stab moved only as part of the trim system, as on other planes. When going supersonic, Yeager discovered that the trim system provided control when the elevator didn't.

THe Wright Flyer used an all-flying canard, so the concept wasn't really new. It became standard on the F-86 and other fighters because of the X-1 experiences.

Ben, a flapped surface reaches a higher Cl before stall than an unflapped surface. It develops more lift before it quits.
Then, it behaves like a compressor/turbine vane, turning the prop blast more effectively than a single surface can.
At zero airspeed, the turning vane effect is what permits hovering and torque rolls.

Muhahahahah Naiveness is bliss!!! sorry for the misinformed post I should have re-worded it. I'll make sure I'm entirely sure of what I'm talking about next time I post in reference to history

Tall Paul, is that a Quique ARF Yak54 that you have on your Avitar? i was checking them out at toledo, they looked great how do your like it?

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That's probably the last flying GP CAP 232 EX ARF.. The CAP and its companion Extra had a brief career of popularity locally a few years back.
Extras flew well, CAPs, well they flew like CAPs. The "CAP snap" was their speciality. Mine survived a few years longer than most, mostly by not flying.
OS 70 Surpass.. I got interested into seeing if the snap problem was curable... Played with the horizontal.
Tried removing it altogether.. the plane nosed over on takeoff a couple times because there wasn't sufficient elevon surface in the prop slipstream at low speeds to keep the tail down.
Replaced the horizontal in line with the wing, and it was flying OK, but the receiver battery died... and so did the plane.
I'd like to try it again with another ARF, if I could find one.
Flying AND photographing a twitchy manverer can get "interesting"

On buffetting control surfaces, when the local shock gets on the hinge line, the surface will buffet. I've seen this on Tristar spoilers a lot.. about .85 Mach, the local shock wanders around on top of the wing where the spoilers hinge, and these do a little dance.
With the X-1, the elevators lost effectiveness when the local shock was on the hinge line. Moving the whole horizontal was found to permit control. This was a SECRET for a long time, publicly debuting on the F-100 and then the MiG-19, the C-model of which showed up with a flying slab after the conventional version proved poor to lethal.

WoW, that covering fooled me looks like a yak from a distance, too bad about the crash

The scale color scheme was SO BAD! I had to add color just to see the silly thing!