takair

Never thought to check there….sure enough….https://www.mcmaster.com/products/barrel-nuts/dowel-nuts-2~/

…..also…have you ever noticed….when there is an audience….you yell “CLEAR” very loud so that everybody knows you read the AIM. However, yelling “clear” too loud can scare the engine into having performance anxiety and leads to that awkward silence at the end of a few turns of the prop. You will notice that with each subsequent attempt, you say “clear” more quietly until the engine finally determines that all conditions for it to run are met.

It’s interesting how many variations there are to start techniques. I will say mine has evolved over the years and the equipment installed. In its latest and most reliable iteration for my configuration (SureFly mag), I have been using the same technique hot, warm, and cold (gasp). Throttle about 1/4” open, pump on, mixture rich of slow count to 5, mixture closed, starter until it catches, mixture rich assuming solid catch, RPm to 1000. Occasionally on a warm start it will have to try twice. Warm start always seems to be the odd man out. I suspect this consistent starting as attributed to the SureFly and starting rich. Your mileage may and likely will vary. Some choice language may or may not help too….

OP is right, crazy expensive. I’ve made my own as well. I’m surprised nobody has these as a PMA part….hmmm?

It was earlier mentioned about adding matched recess for the other controls and then screening it. That’s a good idea. Another, less elegant, would be to cut a thin overlay that goes across all three. Pick up the existing hardware to hold it and maybe some 3m double sided tape. Recess the throttle as required. Have it painted a nice contrasting paint, and silkscreen or laser engrave. You can have them outline the edges. Local trophy shop can do it for next to nothing. It could look quite nice and intentional. Before the advent of quick CNC cut panels we had to do this kind of stuff a lot when doing avionics mods. Many of the factory overlays were done to hide tooling holes or hardware. I know it’s not the question here but perhaps it helps resolve the issue.

That’s very interesting. That my just work. Would need to see the install manual or pin out to be sure.

Was curious if oil pressure was fluctuating when the RPM varies. That might indicate air….but usually the RPM would tend to go high. Regarding MAP, unrelated to the oil pressure, was wondering if that might surge with the RPM shift. In the plot, both seem to be going down? What do these look like over your original plots? Were you reducing power? Is red oil pressure? Wonder why that is drifting down?

Do you have a plot of MP and oil pressure? May or may not present some hints.

Cliff, if I understand correctly it will do LPV approaches if one has a navigator, correct? Is it also true that it will not do an ILS approach?

I wonder if this STC possibly missed some harmonic resonance of this combination airframe (Porsche legacy) , engine, prop? Is this exact combination on many other airframes? I would be curious to hear from a metallurgist if and how calendar time in service can play into this type of fatigue failure. I don’t believe it does. Formal NDT may have caught it, but it seems to me that flight time in service is a better indicator of cycle related stress than calendar time. Even then it seems like there is a missing link to this failure. I also have a theory that the annual lube interval and amount adds up to an overfilled and leaking hub in about 12 years. I would again be curious how many, if any, leaking props come back underlubricated. Hard to say what the alternative is since it is hard to determine that there is adequate grease through the hub, but I am coming to my own conclusion that the leakage and 12 year interval may not be entirely coincidental and may not be purely due to the orings. I wish there was a better way to asses grease condition and dispersal than to just add grease as the various iterations of the service manual have suggested. Edit: I am venting my frustrations of my Hartzell props with regard to the grease. Likely not appropriate for this thread…apologies.

@Jerry Pressley just advertised a field of Mooney parts…

Based on Byron’s description I start to wonder if something is not right in the governor. It seems like something happens at the end of travel where it has a non linear response. I wonder if some break in debris may have gotten into the mechanism or internal valves and prevents it from going back to 2700 once it’s running. If I have my governor theory right, you are looking to reduce oil pressure to get flat pitch. Maybe the “valve” is held open allowing oils pressure to regulate high. I will say, I had an issue years ago where FOD damaged my governor. In that case it would behave differently with different oil and even the age of the oil. Not sure how one would diagnose. Good prop shop can put it on the bench and test it.

While I’ve never heard of it, is it possible the prop itself is sticky and not going to lower pitch? It does seem more like a governor problem though…

Just add water and fertilizer and they grow into Ovations.

I think you can only search the trailing numbers. Alternately, you can plug in numbers here. https://aircraft.faa.gov/e.gov/NN/reserve.aspx