Is there a need to add a counter balance to a single rotor? I want
to have a go at the exact same thing. 150 HP from such a unit would
be SOOO useful in the 600 kg MTO weight class in oztraylia too.

Richard Sugden

Absolutely. It must be dynamically balanced.

Paul Lamar


What a great article on dynamic balance. Thanks. L F Wings.


We should remember that the coupling will have to be balanced too,
statically and dynamically, including the elastomeric pieces, which
makes me start thinking of a single mold or pattern from which each
elastomeric piece is fabricated, to help keep them very uniform.

If the elastomer manufacturing process is not really uniform, might
have to balance the metal components with the elastomeric units
positioned and marked.

For the metal components, perhaps drill EACH vane edgewise
near the periphery and then tap for set screws.
To balance, place lead shot as needed.  This could allow for static
and also dynamic balancing:  you could first place spacer material
into the hole, then lead shot, then finally more spacer material. The
static balancing aspect would be from how much lead shot is placed in the
holes.  The dynamic balancing aspect would be from how far down
the hole the lead shot goes by varying the spacer material before and
after the lead shot.  For the other holes, fill up with only spacer material.

Gene Kahn

Paul, it was a pleasure to have spent a little time with you at Santa
Paula airport.  Hope to see you again some time soon.


I hope you slipped a bit :)

Paul Lamar

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