CGY750 Governor Expert Setting question

[mike4406]

Just wondering if anyone can tell me what the difference is between the Low Limit at Hovering setting and the Low Limit at Idle Up on page 116?

While the manual gives you the default settings, I would like to know what exactly each of these settings actually do and which one(s) to adjust, and why? What does increasing or decreasing the % actually do?

For example, with the good ole GV-1 on a gasser helicopter, we would go into the hidden menu and adjust the LMHV default setting from 20% to zero, allowing the GV-1 to pull the throttle linkage back to the actual idle point to further prevent over speeding when unloading the disk. Curious to know if the Low Limit Hover or Low Limit at Idle up would be similiar? For example, if I'm in Idle up 2 and I am still over speeding when unloading the disk, which one would I adjust, or both?

[Steve Evans]

One of the mysteries of that section of the manual... along with what StartDly actually does and what it's unit of "St" means. Also the Rv.UpDly and Rv.DnDly have units of Frm (frame?) which are also not explained.

I'm still not sure what the difference is between THR.Mode of Fixed and Tx.Curve is, when the latter is used with a 100% flat curve. Tx.Curve with 100% flat is much more stable. Using Tx.Curve with a curve results in the regulated speed wandering; I expected it would be a programmable feed-forward, but it's much too sensitive. As for what Opimize does, that's anybody's guess!

Steve

[Eppler]

They set the min % of throttle that the 750 will travel to reduce the RPM. They are direct % of throttle so if you set it for 20% it will not travel past 20% throttle to lower RPM. I have a gasser and mine would not reduce HS below 1900 so I lowered llmt_hov from 25% to 21% and llmtidup from 40% to 25% now I can run below 1600 HS If needed. I set the llmt_hov to 21% because my gov turns on at 20% that way it will not turn off the gov.