I had an issue with my RPM fluctuating on my flight this past weekend. The aircraft was at 12000 feet, 20 MAP(WOT), at 2300 rpm. The rpm was slowing surging back and from from 2280 to 2340. The oil pressure was remaining steady at 89 psi. I reduced the propeller rpm to 2200 and then slowly raised it back to 2300. This seemed to help and the variation in the rpm went down to 2290 to 2310.
Another piece of information is that since new, the engine had to be at at least 1900 rpm to be able to cycle the prop as part of the preflight checklist. At 1800 rpm, moving the governor control would not change the pitch of the prop. Don't know if these are related but wanted to raise this issue. Spoke to Hartzell awhile back and they said that this is normal. This is my first constant speed prop so I did not have any personal background. Everyone else that I spoke with stated their prop would cycle a much lower rpms.
My engine is a Lyc 360 with the Hartzell governor (PROP GOV HZ 320/360) and prop (PROP C2YR-1BFP/F7497) bought from Vans.
I would appreciate any advice. Don't know if I have an issue with my governor or propeller.
Another piece of information is that since new, the engine had to be at at least 1900 rpm to be able to cycle the prop as part of the preflight checklist. At 1800 rpm, moving the governor control would not change the pitch of the prop. Don't know if these are related but wanted to raise this issue. Spoke to Hartzell awhile back and they said that this is normal. This is my first constant speed prop so I did not have any personal background. Everyone else that I spoke with stated their prop would cycle a much lower rpms.
My engine is a Lyc 360 with the Hartzell governor (PROP GOV HZ 320/360) and prop (PROP C2YR-1BFP/F7497) bought from Vans.
I would appreciate any advice. Don't know if I have an issue with my governor or propeller.