On Sunday, June 23, 2013 10:40:15 AM UTC-7, Soartech wrote:
Wondering if anyone here has experience with a mercury auto-balancing accessory for prop vibration reduction on their self-launcher, ultralight, etc..

www.balancemasters.com/ultralights

I don't know how or if the "self-adjusting" centrifugal balancers work. It defies whatever logic I might have, as I'd think the weight would migrate to the heavy side (g).

Dynamic computer balancers work very well and are pretty much the industry standard for prop, turbine, and rotor blade balancing. They have the advantage of balancing the entire rotating mass at speed.

Static balancers usually require prop removal, but they do okay for blade imbalance. I think they'd have a harder time correcting for an imbalance at 90 degrees to the blade axis. My 26E had such a lateral imbalance when delivered and it took a fair amount of weight to correct (partly because the weights had to go on the prop mounting bolts).

"Double straight edge" I believe refers to setting up two lever straight edges. A close fitting bushing is used through the prop hub and to mount the prop with a small diameter center pin that spans between the two straight edges. When mounted such, the prop should stay horizontal, as a heavy blade will rotate downward. Works similar to a motorcycle wheel balancer.

bumper