"Hmnnn ...... not a bad idea at all. A double ended paddle sitting on top of the oil with an axle through the middle. Coupling electronically to the axle's position relative to the glass would be simple."
Hi ADI,
Thanks for the compliment.
Went round and round with that last night. Seems, simplistically, that the DF must tilt FIRST to accelerate. If the initiation of that tilt can be terminated, instantly, by sensors, back to level...there would be no acceleration. Viscosity, physical sensor design, and sensor output handling would dictate the hunting frequency.
In a real helicopter, you can hover motionless while somewhat aggressively "stirring" the cyclic. While the control inputs, and results, are quite huge, you go absolutly nowhere, as they cancel out....if you do it correctly.
In the case of a desired acceleration...in an upright flying craft as the DF
(sorry Clam..
working on stability here,...not loops) 
the sensor would reestablish gravity relationship quite quickly, as prolonged acceleration isn't an issue. Also, rotorcraft can't pull "holeshots" so the tilt/acceleration argument should be quite minuscule.
What I thought might be quite peachy[sm=idea.gif] would be mounting the tilt sensors on servos....and having the tilt sensors directly command the ESCs. One problem there...throttle...haven't quite mentally gotten around that issue yet, but I see it possible, just need an overall modifier.
The reason for the servo/sensor thought was to easily overcome the arguments between the pilot and stability sensors. Also, Tx trim function could be utilized to zero out attitude, and help counter drift in a wind. It also seems a sensor commanded ESC is easier than one signaled by the Rx??
Did you get a good look at the glass vial sensors at:
http://www.frederickscom.com/product..._overview.html
The circular one looked real interesting???
The have a diagrams showing how they are constructed. No big deal, but they require AC supply current and the two signal legs appear to divide the input proportioned to tilt. I assume it's a restive function between the fluid and the electrodes.
BTW, How do they count posts here...and what is that contributor rank system ?? I show 16 for the last three at least.[sm=frown.gif][sm=frown.gif][sm=frown.gif]
Cheers,
John
"Box?......what box?"[sm=idea.gif]