Thank you, Sinco.
Besides the novel control wheel, there was an issue with the fin and rudder, which I discovered during my research:
The large cabin, around which the aircraft had largely been designed, created turbulent airflow which tended to blanket the tail surfaces at low speeds. Test pilot Rex Stedman had considerable difficulty making turns during early flights.
Within three weeks of its first flight the Ace had been fitted with twin fins and rudders and the dihedral of the wings had been reduced.
Nothing immediately available so Open House