Alan Maurer Posted August 23, 2023 Report Share Posted August 23, 2023 Hello Mooney People, Who can tell me what actually gets done with the prop gov to switch 2500 to 2700 max RPM in the Ovation? Thanks Alan Quote Link to comment Share on other sites More sharing options...
Frank B. Posted August 23, 2023 Report Share Posted August 23, 2023 7 hours ago, Alan Maurer said: Hello Mooney People, Who can tell me what actually gets done with the prop gov to switch 2500 to 2700 max RPM in the Ovation? Thanks Alan It’s just an adjustment made by backing the screw out. You will get approximately 200 additional RPM FOR EVERY 360° revolution of the screw, assuming that the governor is controlling your max / takeoff RPM. But, the propeller governor should NOT be what’s controlling your maximum RPM at take off. If your low pitch stop is set correctly then WOT you will make just under full RPM. Then as you start your roll down the runway the RPM will come to the 2700. When the pitch stop is properly set the adjustment screw will be just barely touching, but not regulating the RPM at WOT, take off power setting. 1 Quote Link to comment Share on other sites More sharing options...
LANCECASPER Posted August 23, 2023 Report Share Posted August 23, 2023 10 hours ago, Alan Maurer said: Hello Mooney People, Who can tell me what actually gets done with the prop gov to switch 2500 to 2700 max RPM in the Ovation? Thanks Alan The overhauler does what they call a C290D3 T20 upgrade which changes out the spring in the prop governor, which allows it to go to 2700rpm. It may be a good time to do an IRAN on the governor to look for any other items to replace while it is opened up. I had one done in November 2014 on an Ovation. Back then the shop charged me around $900. 1 Quote Link to comment Share on other sites More sharing options...
Frank B. Posted August 23, 2023 Report Share Posted August 23, 2023 2 minutes ago, LANCECASPER said: The overhauler does what they call a C290D3 T20 upgrade which changes out the spring in the prop governor, which allows it to go to 2700rpm. It may be a good time to do an IRAN on the governor to look for any other items to replace while it is opened up. I had one done in November 2014 on an Ovation. Back then the shop charged me around $900. I guess I totally missed what his question was! Quote Link to comment Share on other sites More sharing options...
LANCECASPER Posted August 23, 2023 Report Share Posted August 23, 2023 Just now, Frank B. said: I guess I totally missed what his question was! Alan has been asking about the 310hp STC upgrade to his Ovation for awhile. You would have had no way of knowing that from the first post on this thread. Quote Link to comment Share on other sites More sharing options...
Alan Maurer Posted August 23, 2023 Author Report Share Posted August 23, 2023 Thanks to Frank B and Lancecasper for these answers. Sounds like the answer to crank the prop gov for 310 hp is either a screw adjustment or changing the spring inside the Governor. Whichever it is, Sarasota Avionics bought the STC from Mooney and is planning to do the work and paperwork on Monday Aug 28 . I have been curious to know exactly what work has to be done to accomplish this and if it is actually difficult. I plan to hang out there on Monday and then, of course, there is always the test flight Thanks Guys Alan N913ND Quote Link to comment Share on other sites More sharing options...
LANCECASPER Posted August 23, 2023 Report Share Posted August 23, 2023 3 hours ago, Alan Maurer said: Thanks to Frank B and Lancecasper for these answers. Sounds like the answer to crank the prop gov for 310 hp is either a screw adjustment or changing the spring inside the Governor. Whichever it is, Sarasota Avionics bought the STC from Mooney and is planning to do the work and paperwork on Monday Aug 28 . I have been curious to know exactly what work has to be done to accomplish this and if it is actually difficult. I plan to hang out there on Monday and then, of course, there is always the test flight Thanks Guys Alan N913ND The vast majority of the questions asked on here I don't know the answer to. On this one I do. I've done the 310hp STC on an Ovation. It's not a screw adjustment. It's the C290D3 T20 upgrade which changes out the spring in the prop governor, which allows it to go to 2700 rpm. I enjoy @Frank B.'s comments but he flies a Bonanza 1 1 Quote Link to comment Share on other sites More sharing options...
Alan Maurer Posted August 24, 2023 Author Report Share Posted August 24, 2023 Sounds like the answer from Lancecasper is the answer. Hopefully Sarasota Avionics has the new spring for the prop governor. Thanks everyone Alan Quote Link to comment Share on other sites More sharing options...
PT20J Posted August 24, 2023 Report Share Posted August 24, 2023 What does the STC say about the prop? As @Frank B. said, it shouldn’t turn 2700 rpm static without changing the low pitch stops. Quote Link to comment Share on other sites More sharing options...
Alan Maurer Posted August 24, 2023 Author Report Share Posted August 24, 2023 YUP, I AM SURE TAHT ISPART OF THE PROCRDURE Quote Link to comment Share on other sites More sharing options...
Frank B. Posted October 15, 2023 Report Share Posted October 15, 2023 On 8/23/2023 at 3:11 PM, LANCECASPER said: The vast majority of the questions asked on here I don't know the answer to. On this one I do. I've done the 310hp STC on an Ovation. It's not a screw adjustment. It's the C290D3 T20 upgrade which changes out the spring in the prop governor, which allows it to go to 2700 rpm. I enjoy @Frank B.'s comments but he flies a Bonanza But how many Mooneys has Frank B. Owned and flown in the past. I still love a Mooney. You should see the M20J project we have going on in my hangar right now. It’s no longer mine, but belongs to another member here. Post some photos Dustin Payne. 1 Quote Link to comment Share on other sites More sharing options...
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