hazek

Thanks Rick, that was very good to see and learn from! Anyone else willing to share?

Thanks for the input so far. But would be cool to see some of your flights’ data and compare. Yesterday my plane was looked at and an induction leak was confirmed on nr5 cylinder. Something that Savvy predicted based on my data. The gasket was completely destroyed and the induction manifold was covered in telltale blue stains. (see pic) The flight I shared was prior to that being fixed. Since Savvy saw a problem I’m just curious how my data compares to everyone else. Perhaps that leak was not the only problem. Perhaps how my EGTs behave during various phases of flight might show something else. But I’m also getting the “too much data for such a crude machine” line, and that I can’t expect temps to behave exactly to expectations. Well, one the hand I agree and entirely see the point but on the other hand seems like data can indeed show a problem and it’s not just variability. So again, would be really cool if we could compare a bit. Especially those of you who have a very nicely tuned Bravo, something that’s very hard to get to over here in Europe with so little expertise available. Don’t be shy, you can share also just in a private message, I will not abuse your privacy. Just really am looking for more data and trying to establish a baseline expectation for my plane.

Could some Bravo driver please share their engine data for a flight or two recently flown. Especially if when you set descent power you reduce MAP and then set 2000RPM and lean to peak(or rather your TIT limit). And then go rich only shortly before landing. My EGTs behave strangely and I’m investing it. Example: https://apps.savvyaviation.com/flights/shared/flight/9918044/7b2f4c42-0682-4108-bc82-6710a969fd1a See at 00:29:45 timestamp, EGT3 stops being hottest and moves to middle of the pack just as I reduce RPM to 2000 for the descent. Then as I go mixture rich the order switches again and EGT3 is hottest again. My main question is if this is normal behavior, i.e. do other Bravo drivers see the same?

Did you ever get the results? What was the conclusion to this story? Thanks!

For propeller blades relative wind is not from head on though? It’s at an angle due to the spinning of the propeller. It’s the sum vector of the forward speed of the plane and the rotational speed of the propeller. It’s head on only if the plane is moving forward and the propeller is stopped.

So, do we now agree that my original questions were valid?

If you run your tank dry and the engine stumbles and you switch tanks throttle is open though?

Got it. Makes sense now.

Would you mind explaining how this happens? I didn’t realize I didn’t understand backfire correctly.

But when the fuel is reintroduced while the spark is on, does it start to burn immediately and none of it is too lean to burn and therefore fills the exhaust? Again, I have no clue, just thinking this through.

I have no clue. I’m just asking questions. But I do believe I heard Martin the Bonanza youtuber say this in his in-flight mag check video. Not sure though.

When you re-introduce fuel of course. If you do so reflexively without first reducing power and mixture to idle. The startle effect could easily cause one to do so.

I was always wondering how does one preserve the most fuel on the fullest tank for that landing but I thought running a tank dry is extra wear if not actually harmful for the fuel pump? Plus a backfire might happen which harmful for the exhaust. Do people really do this routinely?

I wish I could have four point modern seatbelts in my plane. Even the 3 point seat belts that I have feel inadequate.

Yes. And I ate a humble pie myself recently. I tended to judge these accidents harshly since "pilots should have known better not to do X". Typically the accidents that happen are repeats of the same old mistakes. But I made one of such mistakes recently. Despite being aware not to make it. Despite having SOPs so I wouldn't make it. Despite being well aware of the grave consequences possible if one makes it. Despite thinking about it and briefing it moments before takeoff not to make it. And I did it anyways. I don't understand why I made it. I have explanations but ultimately I don't know. This bothers me. Our fable mind is not a machine, it short-circuits and does stupid shit all the time. The more accidents I see the more I'm asking myself when will I make a fateful mistake. Sometimes the thought does cross my mind that this isn't worth it. But then I have a flight on a perfect VFR day through the Alps and I want more of it!