Thank you Black Square for making this excellent addon!
I was able to reproduce the correct scenarios, and it looks like the ones I tried in my previous post were the expected outcomes.
I really enjoy the plane, and only see people praising it too!
I'll start with some additional questions, and then I'll write down what I did in this particular case and how they worked.
Is that ok that for flooded engine I was able to start the engine without leaning the mixture, and varying only the throttle?
Not related to this issue: I read somewhere you're working on a similar tablet that Duke currently have:
https://community.justflight.com/post/25841 . Is that really true?
Not related: I've read in some places that the state saving has bugs, and that currently you're working on a fix? Is that also true? (I've created a ticket for that very recently.)
About the engine start. It looks like it works as in the manuals. (The environment: normally aspirated Bonanza, EHRD airport, 15 C outside temperature, at mean sea level, standard air pressure, "Clear Skies" weather in July. Propeller high RPM in all cases.)
(1),(2) The cold start and engine flooding case can be handled together. If the auxiliary fuel pump was running high, with full throttle and full mixture with 5, 15, 30, 60 seconds, then the correct throttle starting positions (with full mixture) were 5, 30, 50, 75 % respectively. (The percentages can be seen if the INSTRUMENT DESCRIPTION TOOLTIPS are turned on.) In these cases, it is not possible to start the engine with any other combinations that are listed here: so for example, it's not possible to start the engine if the auxiliary fuel pump was running for 15 seconds, and the throttle (after the fuel pump was turned off) are 5 % or 50 %. So it's pretty good, and very interesting that yes, you have to be careful with the engine.
(3) I was running the engine with 22 IN HG manifold pressure for 4 minutes, the cylinder head temperature went to around 210 C, with cowl flaps open. Then, I turned off the engine for 12 minutes (mixture cut-off, throttle fully closed). And as the documentation says, I was unable to start the engine with the normal cold procedures, but I was able to start it with the hot procedures. Works as expected too. On the other hand, I tried with different combinations, and I was able to start the engine sometimes easily.
Thanks, it really looks like I just didn't understand how the engine works, but I learned a lot.