BlenderPilot
Not sure when the Bell 230 was cleared for single pilot Ops, but myself and 5 colleagues were the first cleared in the UK for single pilot IFR in the Bell 212 in Jan 1980. Can't say whether the 230 is more stable than the 212 as I've never experienced the 230
For those interested in more reading on Gurney Flaps. The following URL's to articles in Rotor and Wing might be enlightening.
http://www.aviationtoday.com/reports...0/02rwaero.htm
http://www.aviationtoday.com/reports...0/03rwaero.htm
Apologies here to FlightSafety as I noted later that he has already included these links, slightly in disguise......