Drill holes and add weights to the spinner bulkhead.
Hmm, would it make sense to drill a series of evenly spaced holes near the perimeter in during construction to provide for this? Maybe Van's should add this to their design?
Turbines do that but you would need to account for the loss of material as most of the holes would remain empty.
As long as the holes are symeterical, it should make zero dfference.
I actually prefer drilling them myself. Using pre-drilled holes often requires splitting weights, whereas drilling the hole allows precise location of a single weight.
Use a #13 drill, and then a 3/16" ream to ensure a close tolerance fit for an AN3 bolt. Works well.
99% of the time I split weights so that you can tweak the solution, it's difficult/almost impossible to precisely nail the exact angle with a single hole. The ease of splitting weights with some machines is much easier than with some more basic units.
If I could do it over again, I would have pre-drilled eight to ten holes in the bulkhead before assembly and prop installation. That way I could have precisely measured their location. I could have specified these locations in the Dynavibe and saved a step or two in the balancing process.
Randy, I?d check with Van?s to make sure there are no structural issues, don?t think there would be. Also, I?d deburr and chamfer the holes thoroughly to avoid cracking.
Scott,
When placing the temporary weights on the outside of the spinner, what moment arm, specific distance, do you use?