Originally Posted by
Cat 1
I suspected its was a HELI governor but have played with them a bit and was wondering how you "tricked" it..
"Theoretical Idea Moment" - What if we built a "carb" with two throttle elements with and spray bar in between - No venturi per say . If we controlled both inlet and outlet with fixed curves and delays we should be able to control both the flow (speed) and the mixture profile.. Not an improvement on the solenoid in my opinion but a different method of control.
For certain applications, that would most definitely work, although I would place the spraybar in the 2nd throttle barrel just to keep a good atomisation (turbulent flow at the point of fuel supply).
Such a set-up can even be done as a strictly mechanical thing, varying the bias by means of the lever geometry.
I see that as absolutely viable, but very limited in application. It could be an ida for helicopters though, because my .50 gasser heli also was impossible to tune properly, and relied in essence on the governor FORCING the RPM to be constant. A second throttle in front of the carb, even simply mechanically actuated, might have proven very benificial to the point where a governor would become obsolete. A "no governor situation" would have in turn allowed for the solenoid and TX-based fuel curve to function properly (although dialling in the curve would have been a real challenge.
But although the solenoid and electronics are the subject of this thread, it sometimes is good to at least explore analog ways for mixture control, even if for no other reason than to learn about mixture requirements, and the physical conditions that influence mixture and in what way they do that.
Learning is the essence, the results of the knowledge gained is the goal.