As I recall from some reading, back in time there was certain lower RPMS that were prohibited from continuous use, and I think that was the old time yellow arc. Something changed, and that prohibition is no longer in effect. That may have been my caution arc. I have no idea then why my range is like that for top RPM. In my limited flying so far I was never able to get it there with the cruise prop anyway. Maybe if I pointed it down hill. Then again, maybe I have one of those rare "racing engines" that has a higher green arc so I can outrun the "normal" coupes!
--- In [email protected], John Cooper <j...@...> wrote: > > On 3/9/2010 12:35 PM, Donald wrote: > > mine came to me wth arcs marked as follows: > > 600-1900 Amber-yellow > > 1900 to 2625 Green > > 2625 to 3050 Red > > > OK, not a C85 tach. All C85s are limited to 2575 RPM. > > I've seen many tachs with amber arcs at lower RPM's. Apparently this > was the range where carb heat is recommended. Present day marking > convention calls for a green arc anywhere that continuous operation is > permitted. On the C85 that is from idle to redline. > > -- > John > Skyport East > www.skyportservices.net >
