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The dynamic balance of the two rotor engine is the opposing rotor. The counter weights only take out a longitudinal imbalance caused by the rotors being offset from each other. True dynamic balance of a single rotor would require the same weight as the rotor in opposition, at the same moment arm length. Anyone with a balance machine could spin up the assembly and tell you how much weight to add to the counter weights. Just put a rotor on the crank and the counter weights and spin it up. Plus, there is the oil weight trapped inside the rotor. So you might want to deduce how much weight that is.
The total weight of both counter weights is not close to 10 pounds, so I am thinking quite a bit of weight must be added.
Richard Sohn as done some remarkable work on his engine. Note how thin his end plates are. The whole thing is under 100 pounds now and even done with 13B parts would not weigh much more. That should be less than one pound per HP. Very Impressive.
I have no use for a single rotor. I am interested in any form of the engine. A turbo single rotor could be 150 HP and weigh less than 150 pounds. Very interesting. I do have plans and the book for the BD-4 and have collected some pieces. So maybe some day. I thought that once I had retired there would be so much time for all of this kind of thing, but I am now a one armed paper hanger, with less spare time than when I worked. Any airplane engine I do would be a Periphery Port with Tracy's controller and reduction. It will run real well. Once the bugs are out, it would get a turbo.
Lynn E. Hanover
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