Lauri Tarkkonen wrote:

There are several systems and it was very common before they came up
with the servo pendulum. If you have read Peter Förthmanns books, then
you should have noticed him explaining such things on pages 46-47 and
there are pictures of two on page 46.

I think you should take Peter's book seriously, he knows what he is
talking about. I studied this topic about 5 years before I decided on
the system and now my vife says: Why did you not buy this earlier.

- Lauri Tarkkonen

Are you refering to the auxillary rudder approach on pager 46?