Denarq Twin Beech - Beech 18 improvements mod. New small Update 1.5.1 is out

Guys, you are very kind with your words. It means a lot that you are enjoying my mod.

I never did. I was happy with fuel consumption and never feel the need for any change.
But with this late discussion and the issue with full rich fuel consumption and with these new tools there is no reason for not to improve the fuel behaviour.
So today I started working with some new tools and It seems I already have good results.
The new “use_volumetric_fuel_flow” is very good and now fuel consumption is based on the current mass air flow through the engine multiplied by the mixture ratio. This gives us a much more real fluel flow that increases with mixture at all ratios.
And there are other tools that allow a more refined finetune of numbers.
I already made some changes and tunning and initial tests at 5000 ft gave me very good numbers, from manual lean to full rich.
I have to do more tests but for now I’m very optimistic.
Understand that fuel consumption will not change on majority os settings. It is only to fix incorrect fuel flow at full rich vs rich of peak.

I already have a new patch in beta testing. This patch isn’t as relevant as previous ones but this new fuel changes should already be in.

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I realize it’s a lot of work to learn each thing, but it sounds like the new mixture related tools have been a long time coming. And though it may not seem “important to you”, IOW, it may seem like “well, if you fly the plane properly it hit the numbers, and this only affects when you do things wrong”, this kind of thing is super important, and has been noted by so many before me here, it’s such a relief to know that you actually have to fly this plane, and if and when you fly it right, it’s very satisfying knowing you learned something and did it, if you know what I mean. Thank you so much for looking into it and doing all this work!

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Hi, just start to fly with beech18 and discover your mod today ! It looks incredible, but I think I’m missing something with the installation. The panel is still the vanilla one ( no fuel pumps switch) . The original booster button still work, but I can’t switch off the pumps

Thanks for your awesome work

Hi Alex - Thanks for the timely and detailed response. I will start with my disclaimer that I am certainly not an expert either, whether in the sim or in real life, so I mainly offer observations and questions.

I took you up on your challenge. I repeated your test at 5000 ft, 30.5 in Hg MP and 2000 rpm with various mixture settings. I report my results below in a format similar to yours:

TEST 1
RPM: 2000, MP:30.5, alt:5000ft
POH (manual lean): 53 GPH (Fig. A-7 p. 88 of C-45H manual)
-My (MeyerFlyer99) tests-
Manual Lean Procedure (p. 63 of C-45H manual: EGT (L/R) 1327/1337: 49.0 gph
Max EGT: EGT =1462/1459: 63.3 GPH
50 F LOP: EGT = 1410/1409: 59.8 GPH
100 F LOP: EGT = 1361/1360: 54.0 GPH
50 F ROP: EGT = 1415/1408: 66.7 GPH
Manual Lean Procedure (p. 2-12 in Expeditor manual): EGT = 1374/1407: 67.9

Note the following:
All EGT’s are in deg F. “fuel_flow_scalar” = 1.03. For both manual lean procedures, I ignored the EGT gauge until I had completed leaning. For the C-45H procedure, the first time I did it and saw a 25 rpm drop (per the procedure), one of the engines quit and I couldn’t get it started again. I did it again, but more cautiously to not lean too much.

For the C-45H procedure, I ended up at about 120-140 deg F lean of peak. For the Expeditor procedure, I ended up at 50-90 deg F rich of peak.

So it appears I am closer to your numbers - even matched it closely with the C-45H manual lean procedure. I’m maybe a couple gph higher (~4-5%) than you at other conditions. I would also note that with variable pitch props, it is hard to lean manually using rpm drop. If you lean slowly, you may miss rpm drop as the rpm is controlled. By the time you see an rpm drop, you may be way too lean. Using the prop sync indicator with quick short changes in mixture lever as suggested in the Expeditor manual seems a more precise method of manual leaning. Of course, using EGT is even better.

I see from a later post that you are using some improvements in mixture control in the sim to make some changes in the mod to more realistically model the effect of mixture changes. Thanks for this - we appreciate all you do on this mod.

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The installation of this mod is quite simple and straightforward.
You just have to put mod folder in comunity folder. Assuming that you have done this, my advise is to remove mod and Beech 18 original plane; close and restart Msfs; install Beech 18 again from scratch and then install Denarq mod.

This is the WIP v1.4 log.

New features:

-Introduction of “Aircraft identity”:
Planes of the same model are generally manufactured to meet certain specifications and standards, so they should behave very similarly. However, there can be some variation due to factors like manufacturing tolerances, materials, and individual components that can contribute to little differences in behavior. So, while they’re designed to be consistent, you might still find some subtle variations between planes of the same model making each plane to have its own identity.
With v1.4, this “Aircraft identity” will focus mainly on engine performance and fuel quantity indicator error.

In reality, there are no two identical engines, especially when we talk about these older engines. Each engine has its own personality with slight variations in power, temperatures, etc.
Now, every time we perform a “reset” on the engine, a random value is generated that will influence many engine parameters, including power, temperatures, oil consumption, etc. This value will stay with the engine throughout its life until a new engine reset is performed and it will stay constant. The introduced variation can range from 0% to a maximum of 2%, so although the differences between engines will be marginal each one will behave slightly different from each other.
All the remaining variables that already existed will continue to coexist with this new engine variation concept.
-Fuel quantity needle. Every real pilot knows that fuel endicator needles give us good estimations, but aren´t to be totally thrusted. They all have small errors. In Denarq mod, on your first flight, a deviation error is created for each fuel tank measure instrument. This error will stay the same during all aircraft life until state settings file is deleted. Than a new deviation error will be generated.
This error is small but sufficient to give us slightly inaccurate indications of the fuel quantity, either more or less.

-Fuel pressures drops gradually when active fuel tanks are near empty. This will trigger fuel pressure warning lights around 1 minute prior to min. usage fuel for that tank. This is your best and thrusted method on knowing when to change fuel tanks (see item above).

-Completely new scratch made propeller feather and propeller feather buttons behaviour according to real Beech POH. (See manual)

-Engine prime now requires aux fuel pumps to be ON. Engine prime knob will move nonetheless but it will not prime without fuel pumps.

-Fuel selector and crossfeed valve knob are now persistent beetween flights.

-Update Denarq Mod manual.

Improvements:
-Improved ground handling with free castering tail wheel.
-Improvement of fuel flow/mixture using new options added in SU13. This should fix Msfs core limitations on fuel consumption.
-Fuel tank quantity needle animation adjusted.
-Adjusted RPM/manifold pressure ratio calculation on detonation to allow a wider range os settings covered in real POH.

Fixes:
-when engine was outputing less than 117HP, oil consumption was negative. FIXED.
-Fuel detonation wasn’t affecting engine power when engine wear is above 95%. FIXED.
-In some very rare ocasions, during startup, aircraft starts to spin in the air. This is due a MSFS glich during flight loading where some hardcoded variables can reach super high values for a fraction of time. POSSIBLE FIXED.
-Batteries persistent voltage levels not saving. FIXED.
-AP not following HSI heading but real heading. FIXED

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Guys, Flightsim.to is promoting the mod of the year Awards.

To those who apreciate my mod, I would be very grateful to have your vote in the category “Best Aircraft Modification”.
This would be a great help in promoting my work.

Thanks alot for your suport.

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On it! Your mod is just fantastic and I appreciate every bit of work you’ve done to improve the Beech 18

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Being yourself with your early mods of flightmodels my biggest inspiration to start modding, is a great honor to have your vote.

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Oh my!! If I’m running my tanks to the point I’m getting fuel pressure warning lights, I might as well give up! lol!!

Awesome, awesome work, though, LOVE IT!

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Vote in! Great work!

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Would it be possible to link this new identity feature to a livery? I’m using your mod as freight dog in Alaska and at the same time, flying different world tours. Each one with a different livery. I would love these two Beech behaving differently. And the failures of one not to affect the other.

And of course, count on my vote!

Regards.

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This is by far my most wanted “to do” feature for my mod, but unfortunatly I don’t know how to do it.
I’ve spent many many hours searching for this. I’ve seen files from many planes featuring this but I couldn’t find anything.
I think this is done via WASM but I’m a completly ignorant over WASM.
If someone knows how to do it or could point me a direction I would be very grateful.

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You could check with the Got Friends devs on their discord server.

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Happy to help and well deserved.

Voted just now.

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Voted.

10 chars

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For me this mod is now one of the best engine simulations in the sim. Not something to just jump in and hop into the air. No, it’s serious. And that’s great fun.

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where is the knob to adjust for Compass Gyro drift
I checked with Manuel but I can’t find it?
mike

Carenado shipped this plane without one, unfortunately. But that’s how I learned about the D-key shortcut.

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I just found out that in the JPL152 the state is saved per livery. Maybe in their discord can help you.