I asked one of my "Dark Arts" e-flier friends about trying to get the equivlent of a 4-2-4 break in an electric. He speculated linking the throttle input to a gyro...
Yes, it will work, angular speed equal to lap speed can be base for speed regulaton, but it needs to solve two things.
1/ you must separate yawing (from presecssion, wind, line swinging) from lap time, it needs to make som low-pass filter .. it will be critical point of the system, because speed changes in corners are sometimes quicker then yawing. I do not say it is impossible, just I think it will need lot os time and effirt to make that software. On opposite side, that other componet (blocked yawing) can be used for rudder inputs to damp yawing. That is also possible. I had gyro on my model (look picture), I did some tests and may be later I will continue, for present time I think system on base air speed is better than speed constant to groung. But I am not very sure what we really want - constant speed to ground or cosnatnt speed to air.
2/ the sensitivity of actual gyro units is ot very stable. It will probably need to change gain very often, may be I had very simple unit, but it really needed to change it permanently and biggest problem is, that you must do a test flight, because you do not see its effect on groung (like RPM which you can measure by tacho)