Marshall
You wrote:
>>Several people suggested placing small cavities in the rotor design or
drilling holes in the rotor to reduce the overall density. I think that
approach is needlessly complicated and defeats the purpose of
prototyping the actual desired geometry.<<
In reality this is one of the most common ways of achieving neutral
buoyancy. Unless you are able to find a material that has the exact
density you want. The trick will be to get system so it is staticly
balanced so it will not have a prefered orientation.
If you are doing multiple copies you will most likely core out sections
of the part and plug them to provide the correct bulk density.
Niel Leon - CDS,inc.
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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