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- Jan 1, 2008
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I began flying the BF9-2 in late August 2020. Right from the start I had rpm problems, that is the governor wasn't maintaining constant engine speed. At first it was masked by erroneous tachometer readings. There would be sudden jumps in indicated rpm by as much as 1,000rpm, but with no sound or apparent prop pitch changes. The solution was disconnecting the cannon plug and spraying both sides with contact cleaner. After that rpm readings maintained steady readings. However, during those overspeed indications, when I pulled the prop control full-aft, there would be no response to the prop.
On later flights the prop would respond appropriately on ground run-up, but in the air it would sometimes seem to not respond. On my last flight a few weeks ago, all was normal on run-up, but when I took off the rpm went up to 3,200. I was too far down the runway to land again, so I throttle back as far as I could and still maintain flying speed. I was back to 15"MP and the rpm was at 3,150, and I was at minimum speed of 80MPH. I flew a short pattern 300 feet below pattern altitude and made a safe landing.
The prop is a 98" MTV-9 with 28 hrs since new. The governor has been sent to West Coast Governor. They said it was normal on the test stand; they replaced the spring and have shipped it back to me (arriving next week). I am just wondering if anyone has experience with this condition: full-aft prop control and zero response to the pitch.
Thanks,
Danny
On later flights the prop would respond appropriately on ground run-up, but in the air it would sometimes seem to not respond. On my last flight a few weeks ago, all was normal on run-up, but when I took off the rpm went up to 3,200. I was too far down the runway to land again, so I throttle back as far as I could and still maintain flying speed. I was back to 15"MP and the rpm was at 3,150, and I was at minimum speed of 80MPH. I flew a short pattern 300 feet below pattern altitude and made a safe landing.
The prop is a 98" MTV-9 with 28 hrs since new. The governor has been sent to West Coast Governor. They said it was normal on the test stand; they replaced the spring and have shipped it back to me (arriving next week). I am just wondering if anyone has experience with this condition: full-aft prop control and zero response to the pitch.
Thanks,
Danny
