I changed my pinion to a larger one and went to the flying field for some flights to try it out as I was getting too much bogging on the previous one. I kept the Spirit Gov max rpm settings the same and nothing else was touched.
The first flight was fine but on the second flight I decided to tune the gov settings. I had the Gov response at 6 and holding at 3. I dropped the response to 5 and holding to 1 so I could begin tuning per the Spirit manual.
Spooled up and my top 3100 headspeed was no longer being achieved. was maxing out around 2750. Changing between all 3 Idle Up settings had no effect on the headspeed. Each IU was the same ~2750rpm. Confused, I began checking to see if my pack had blown a cell, nope. So I decided to return the settings to 6 & 3 as they once were. Turns out that dropping the Holding from 3 to 1 was the reason the governing stopped working as expected. Going back to 3 returned the gov to the 3100 I was expecting. It was around 0ºC today, but am really confused by this behaviour. Any explanation for it?
[SOLVED] Odd Spirit behaviour today
When changing pinion you have to change Gear Ratio respectively.
Otherwise the headspeed will be calculated incorrectly. Then it will also hold at a wrong RPM.
Otherwise the headspeed will be calculated incorrectly. Then it will also hold at a wrong RPM.
Spirit System developer
Doh! Yep, definitely forgot to change that.ZeXx86 wrote:When changing pinion you have to change Gear Ratio respectively.
Otherwise the headspeed will be calculated incorrectly. Then it will also hold at a wrong RPM.
Wonder why it provided me with expected varying rpm's on each IU with the holding set at 3, but then the same exact rpm on each IU once I dropped the holding to value to 1 though. Would have expected different values still (but incorrect) without changing the gear ratio.