The OS 140RX no longer appears in the Tower catalog (2010 issue). I'm assuming the OS has finally ceased production of the engine [&o], but it has had a great run. As is typical in pattern, the aircraft designs eventually outgrow available engine power. My solution is simple: build smaller. Unfortunately it requires scratch building (which I enjoy), but it means that aircraft choice for the 140 is limited to what I want to hack out of a balsa log. I like the OS 140 too much to stop using it.
The next question might be... 'How long until pattern is an electric propulsion event?' The only viable glow power plant currently is the YS 170DZ (sadly, the OS 200 seems to have been a disappointment at least power-wise). Hopefully, YS will continue development of the 4-stroke powerplant. Maybe OS or Webra will produce a viable 2-stroke alternative, but I'm not holding my breath - the market just isn't very big.
-Will B.