Question for the experts.
I have 115 hours on my RV10. Hartzell Governor, stock IO540, Hartzel prop, and mags, all new when I installed them. Today I had prop set at 2300, 13 Inches MAP, 3000 feet level flight (~90 knots) just burning fuel for a while practising some stuff. Pushed MAP up to 20, climbed 500 feet or so. As I pushed to level off and accellerate, RPM jumped. The Dynon voice said, "over-speed." By the time I looked it was falling back through 2400 back to the set point of 2300. It happened again while I watched. It jumped to ~2600. Then back down. It settled back with another jump or two. I noticed nothing unusual with the engine or sounds or feel, so it might be just a wire. I've got Dynon hooked to the P-leads. Early test flights had RPM jumpy so I increased the resistance in the lines back then. Never had any issues in the last 100 hours.
Back to today's flight. I pulled power back to 15" to be safe and turned for home. No more troubles. Near the airport I moved some knobs around and in and out and things seemed to behave normally.
Some time back I know there were troubles with another governor where props suddenly went fine pitch and caused troubles. What I don't know is if there were symptoms leading to those events. I'll be pulling the cowl this week to look over the wires and cables and all. Hoping to get some advice from the experts here on what not-so-obvious thing I might be interested in looking for. Or any theories on what might have happened today.
Thanks,
I have 115 hours on my RV10. Hartzell Governor, stock IO540, Hartzel prop, and mags, all new when I installed them. Today I had prop set at 2300, 13 Inches MAP, 3000 feet level flight (~90 knots) just burning fuel for a while practising some stuff. Pushed MAP up to 20, climbed 500 feet or so. As I pushed to level off and accellerate, RPM jumped. The Dynon voice said, "over-speed." By the time I looked it was falling back through 2400 back to the set point of 2300. It happened again while I watched. It jumped to ~2600. Then back down. It settled back with another jump or two. I noticed nothing unusual with the engine or sounds or feel, so it might be just a wire. I've got Dynon hooked to the P-leads. Early test flights had RPM jumpy so I increased the resistance in the lines back then. Never had any issues in the last 100 hours.
Back to today's flight. I pulled power back to 15" to be safe and turned for home. No more troubles. Near the airport I moved some knobs around and in and out and things seemed to behave normally.
Some time back I know there were troubles with another governor where props suddenly went fine pitch and caused troubles. What I don't know is if there were symptoms leading to those events. I'll be pulling the cowl this week to look over the wires and cables and all. Hoping to get some advice from the experts here on what not-so-obvious thing I might be interested in looking for. Or any theories on what might have happened today.
Thanks,