Denarq Twin Beech - Beech 18 improvements mod. New Update 1.5 is out

This is a mod to enhance the Local Legend V: Beechcraft Model 18.

Very important:
This mod has some advanced systems like oil system and others that require very precise knowledge. You have to read the manual in order to flight with this mod. Give special attention to oil system and startup procedures.

Also Important:
It is recommended that you delete state.cfg file before mod instalation.
STEAM: C:\Users\AppData\Roaming\Microsoft Flight

Denarq enhancement Beech D18S
Log V1.5

-New interior red flood light.
-Landing lighs brighter and with increased range.
-reduced dark tint on windshield. It’s now more transparent.

New features:

-New dynamic calculated failures: pumps, generators and fuel gauge.
Factors like turbulence, ambient temperature, time of use and wear are all take in consideration when calculating failure propability af many systems.

-New custom Fuel-flow variable. Wear and identity have now more impact on fuel consumption. Carburetor temperature also affect fuel efficiency and mixture has a new calculation on how to affect fuel-flow much more real.

-Completely overhoul of miniflow_L fuel management system with all real instrument functions and alerts moddeled.

-Miniflow_L instrument with axpanded functions with 2 modes:
1-Maintenance mode: Interface with aircraft systems and its states like engine wear, system
failures and time of use.
2-Debug mode:A tool where you can review after each flight some of the engine parameters
achieved during flight like detonation, max manifold pressure, time above overboost, oil leaks
and its causes aswell an option to trigger an oil leak for training purposes.

-New flight model.
Aircraft is now more stable in flight and landings and takeoffs are smoother.
Adjusted elevator trim to allow finer adjustments.
During takeoff run, tail lifts at slower speeds.

-Adjusted engine and propeller performance.
Top speeds much closer to real POH numbers.
Reduced climb performance.
Less glide speed.

-A bit less Fuel consumption but with much more factor affecting fuel.

-Many adjustments on electrical systems amperage.

-Update Denarq Mod manual with new chapters:
Mixture and Miniflow_L.

-Mod creator: Alexandre Baptista
-Original sound packs:
"Single Engine Pratt & Whitney R-985 Wasp Junior Radial Engine " by Skyhigh Audio Simulations.
“FSX Pratt & Whitney Wasp Junior R-985 Radial dual engine sound set” created by ElmoSlack
(According to these sound packs creators, these sounds are freeware and must remain so.)
-Help on compass light: katIX3647 from
-Help on many many subjects regarding real life aviation: Donovan, aka donovankoch from
-Help on many many subjects regarding real life aviation: Karl, aka kaha300d from

-Beta testing and feedback:
Isidro Magalhães
Pedro Costa
Pedro Trindade
Donovan, aka donovankoch from
Alexandre Baptista
Martin “CommanderTin” from
Jason “CFJDH” from
-Karl, aka kaha300d from

The objective of this mod is to provide a more realistic experience of this fantastic aircraft.

The main aspects that are already implemented in this mod are:

*New oil system with persistent oil quantity, oil tanks, oil leaks, oil consumption and new oil instruments.

*New modern propeller model.

*New advanced [FUEL SYSTEM] with increased functionality like cross-feed valve.

  • Persistent engine wear afecting engine performance and fuel and oil consumption with the ability to view and reset it in the cockpit.

  • New flight model with both air and ground handling.

  • Aircraft performance tuned to much more realistic numbers

  • Underthehood engine code with damage and wear associated.

  • New systems modeled like oil shutters, oil bypass, cabin heat, etc.

Detail log:

Flight model:
-Much more progressive yoke response.
-Takeoffs: More stable behaviour during the runway roll. The tail wheel, if locked, holds the aircraft heading much better. While the tale is on the ground, it requires the use of differential brakes or
differential throttle as described in the real manual and as reported by real Beech pilots.The tail lifts at around 40 kn as real plane and in a much more gentle way. Once tail is up, rudders get much more authority, like real plane.
-Gliding speeds and stall speeds adjusted to real values according to Beech18 Flight Handbook.
-Tuned stall behaviour that is very well described in Beech18 Flight Handbook.
-Many other small details that make each aircraft unique, such as “spongy” controls at low speed or adverse yaw.
-The landing gear behaviour has been completely revised, eliminating the bouncy characteristic.
-Cowl flaps and landing lights have drag. Cowl flaps open reduces IAS by 5 to 8 kn according to pilot reports. Landing lights is much less, probably less than 1 kn but drag is there nevertheless.
-Gliding performance adjusted to match Beech18 Flight Handbook data.

-Where default plane engine power is off sometimes by more than 100 HP to real values depending on situation, my engine is always within 10 to 15 HP to real engine data. This is at all manifold and RPMs combinations and all altitudes.
-Landing and takeoff distances also much closer to real performance charts. Tested at different altitudes.
-Engine overboost at low altitudes modeled. Despite this engine being rated for 36.6 manifold pressure, in reality, it is capable of delivering more than 40 at sea level. This is modeled in this mod.
-Propeller friction and thrust adjusted to match real world behaviour.
-Carburetor heat sensitivity and delta temperature adjusted to reflect real plane icing conditions. “Carb Mixt Temp” gauge in Cº (celcius).
-Oil and Cylinder temperatures adjusted.

Engine custom code:
(All new local variables associated with engine damage are not absolute but proportional to its operating regime.)

-Overboosting engine to more than 36.5 rated MP would lead engine wear and eventually engine damage with possible catastrophic event on that engine (kill the engine). It also rapidly increase cylinders temperatures.
-According to real plane, operating the engine at more then 1000RPMs with oil temperatures less than 40º will make the engine run rought, lead to engine wear and increase cylinders temperatures because of less efficient lubrication.
-Operating the engine with oil temperatures above 90º would lead to engine wear and at higher temperatures to engine damage with possible catastrophic event on that engine (kill the engine).
-Engine 1 minute full power and 30 minutes power is also modelled. Operating the engine above these settings for more than expected time will lead to engine wear. The counter would move backwards once we ease engine effort. Like real plane manual, 30 minutes power setting is altitude dependent.
Sea level: 34.5MP / 2200RPM
5000ft: 33.5MP / 2200RPM
-Operating the engine at high cylinders temperatures will lead to engine wear and if too high will give catastrophic or partial engine event.

New modeled systems:
-Oil shutters. In default plane the animation don’t have any real effect associated and has a dummy oil temperature gauge associated. In my mod I removed this dummy gauge animation. Because MSFS SDK don’t have oil cooling flaps independent for each engine, right now both levers open or close these flaps independent of the engine. But it will give proper oil temperatures changes.
-Oil bypass modelled and independent to each engine modeled. (custom code).
-Cabin heat: In real plane, cabin heat is used not only for passengers and pilot confort but also do deice windshield. In my mod, right lever is used to switch on/off wind shield deice. Left lever is used in conjunction with the engine selector switch to resel left/right engine wear and damage.
-Persistent engine wear. There are many factors that contribute to engine wear. This engine wear can be viewed using “Gal.Reserve” and “Gal.toDestination” positions of FF gauge knob to watch engine 1 and 2 wear. This wear is persistent between flights and it can be saved when on ground and batteries are turned off. Not only bad engine use contributes to wear but there is always a constant value that represent natural engine wear independent of how we use the engine. This constant is such that engine wears 10% each 100 hours of combustion time. Linked to this wear is a lack of engine performance that starts at 95% and is obviously proportional to wear percent.
-Propeller deice has real propeller deice associated and not only a dummy animation.
-Engine now requires prime and starter boost to startup.

Electric systems.
-Engine generators are offline bellow 1100RPM according to Beach handbook.
-DME and ADF now use electric energy and being on or of reflects actual power suply.
(Right now I’m starting to model new electric systems so it is at a very early stage of development.)

Installation :
Copy or extract the content of the archive to your community folder.

Special note about throttles and 3rd party software like
If you use these softwares to config your throttle axis, you have to set them to control localvars:
and their value range from 0 to 1.
In assign a Custom axis and use a rescale value.
VERY IMPORTANT: There is also a simvar THROTTLE1_SET but from simconnect. Don’t use this. Use (LVAR).


You just made my day! Downloading it now.

Oo nice! Thanks for this!

Can you do whatever you did to make it less bouncy on landing to the other Carenado taildraggers too?

My main issue with the Beech 18 has always been the preposterous trim behavior in flight, does this do anything to address that?


Thanks again for this mod!

yes,that is most need for this plane,

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thank´s for the Mod!
engine failture work but no reset ?
and yes i read wat to use to reset…
after test to damage engines i need to restart flight.
were nice to have option not to use engine wear and damage?

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My first flight with this was not successful. I started up, taxied to the runway, lined up and locked the tailwheel. Mixtures and RPM to max and then slowly increased throttle to max.

The plane started rolling, and almost immediately the MP needle started swinging around wildly, but I kept on rolling, and trying to takeoff. Shortly after that engines failed completely.

At this time the MP needles seemed to have given up altogether and remained stuck in the 34” (thereabouts) position, despite the engines being off.

I’m sure it’s all my fault, but found it hard to determine what was going on, or what I might have done wrong

you guys really need to read the notes that accompany this wonderful mod. :rofl:

can he make the plane less bouncy on landing? yes. he did and it’s right in the notes.

why does my plane stop functioning a short time after I go ham and throw the throttles all the way forward? that’s in the notes too. you overstressed the engines and they gave up on you.

the needles bouncing is normal and realistic too for these types of engines as well and it’s a beautiful addition.

edit: engines can be reset by pushing the start selector switch to either the right or left engine and then pulling up on the cabin air lever. I did this for both engines and it works as published in the accompanying notes.


Guys, I understand that without a manual, some systems may be difficult to understand without any additional information and I’m sorry for that.
Some kind of manual is in my to do list for next weeks but for know I’ll update today first post with some aditional information to help you.


You need to let oil temperatures to rise above 40º before using more than 1000 RPM. MP needle started swinging around due to low lubrication of engine. Operating engine at more than 1000 rpm without oil temps not only increase wear but make your cylinders temps to rise very fast. That is why your engine gave up and stuck around 34". You broke something inside due to very high cylinders temps.


ok,get it…
but if you load to runway ready for take off temps should be ok for take off?

that´s i most do,but if you need to wait for temps you spam on runway for to long now

That was my intention. I wrote a template to put oil temps at 50º if a flight on runway was loaded but sometimes it doesn’t work and honestly I really don’t know why. As a rule, always check your oil temps before rpms go above 1100.


yes,my was to cold,and before take off…bäng
so may ad a way to set ready to fly after loading to runway?

if temps ok,i take off and after 34miles all engines show 100% :+1:

that sometimes stuff not work is the Sim i think,get also some planes i need to reload flight to get them work

They were requesting he do the same thing to other taildraggers, not this one. They liked what he did to this one (though, I have to admit, I haven’t experienced the bouncy landings myself).

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You really need to read the posts that you reply to. :rofl:

I asked if it was possible to use the same technique on other taildraggers by Carenado, since they are all extremely bouncy on landing.

@AlexBap8588 Maybe you can shed some light on what you did to address this issue?

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well, i was trying to help but this is gettiing a little chippy. there was a post below yours that i was specifically addressing but that’s fine. i messed up by not quoting the person to begin with. my mistake and i will certainly try to make sure not to do that again.

I might be wrong here, but since the D18’s config files are encrypted (Carenado), he likely made the flight model config from scratch and doesn’t actually know precisely how he made the plane less bouncy than the stock addon. That being said, at least part of it likely has to do with the CG. Carenado taildraggers seem (again, I could be wrong) to have a CG that is too far aft. When the wheels touch, the tail immediately drops, AOA increases, lift increases, and you’re airborne again. Combined with an overly springy landing gear, the result is a bounce fest.

This mod looks amazing BTW; can’t wait to try it out. AlexBap8588, looking at the files, it’s obvious you put a lot of work into this.


I would think working from scratch would mean you’re more likely to know how to achieve each aspect of what you want. From the notes, reducing the bounce certainly seems like it was a goal, not an accident.

Yeah but think about it. He creates a flight model config, it doesn’t bounce, but without the stock config file to compare to, he still may be in the dark about what systemically is causing Carenado taildraggers to bounce.

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