Somian,
I have tried the hanging weight, I found that it holds the RPM but hunts to much during load changes.
I would imagine that if the weight was immersed in thick oil or gel or somehow dampened RPM would be slow to change but accurate. Other concerns would be cable breakage, pulley seizing, outside interference falling onto snagging on the weight (runaway).
The best luck I've had is with this size of spring found at Home Depot.( 0.041" Dia. wire X 0.438"O.D. X 2.5" Long, plus eye at both ends with a total length of 3.2" Spring to be trimmed to length as necessary.
My governor response was increased greatly with some simple modes explained in a rar file I've uploaded to these two sites. (
http://www.badongo.com/file/8842449 or
http://rapidshare.com/files/373321998/Governor.rar.html )
Also another mode that controls RPM changes under load is mounting a heavy flywheel on the generator shaft same as the Start O Matics. I mounted a 110 lb. flywheel to my unit to get rid of the flicker (worked great) and found that it helps to minimize RPM drop during loading or surging when load is dropped. Flywheel was a piece of 2" plate turned down to approximately 16" dia. bored to fit a Browning Q bushing, Its nice to have a machinist for a brother
Bottom line for me is to stick with a spring, Cheap, easy, simple.
Regards
RF