Aerodynamics is one of many reasons why we all love X-Plane. That’s also why, just like with the engine, aerodynamics on the TorqueSim SR22 have been designed to take full advantage of the simulator’s capabilities and get as close as possible to the real world equivalent. Therefore a professional flight model of the SR22 was created by X-Aerodynamics in 2018 – over many months of work using all available resources and documents. It is up to the most recent standards and greatly benefits of the flight model improvements introduced with version 11.41 of the simulator and is ready for 11.50.
Highly accurate cruise speeds and rates of climb
Precise matching of stall speeds and glide ratio
Correct take-off and landing distances
Spot-on shape of the aircraft body to supply the most accurate input for X-Plane´s flight model effects
Accurate control surface areas and deflections for realistic turn rates
A stack of custom airfoils ships with the flight model to resemble the scimitar-shaped propeller as well as the Roncz wing profile introduced with G3 of the SR22 which has some interesting characteristics:
Cuffed Wing Design
This term refers to the non-continuous leading edge with its characteristic droop on about the outboard half. Thus the outboard section features a lower angle of incidence than the inboard section and is still flying while the inboard part is already stalled.
The real wing offers stall strips to complete the cuff effect, and our airfoil polars contain modifications in the places where these are located to accurately account for their effect. Stall strips are small attachments mounted at the leading edge located on the wing´s root, triangular in shape. At high angles of attack, they trip the laminar boundary layer at a location where stall is most favorable to onset, causing earlier flow separation and consequently a sooner stall than on the outer wing portions.
Together with the cuffed wing design, the SR22 wing is engineered to stall from inboard to outboard, allowing for maximum roll control and spin prevention way into the stall.
We would like to take a moment to share our well wishes to everyone during this unprecedented COVID-19 pandemic. Currently, all members of our team are healthy, and as we work remotely already, work is progressing normally. As always, safety and health remain paramount to us.
Steaven McKenzie and Cooper LeComp
Managing Partners, TorqueSim Aircraft Development
The TorqueSim Pocket Rocket is on the final day of its sale (45% off), returning to normal pricing on Sunday, March 22 at midnight eastern time. If you want a fun aircraft to add to your fleet when you are stuck at home, we’ve got you covered! You can get it here.
A fully custom engine model:
Enhanced or custom engine and failure models are becoming increasingly established in flight simulation, but are usually not able to trace the characteristics, peculiarities and limits of an aviation internal combustion engine back to a well-founded model, because there is a lack of physical basis and often simple, schematic relationships are used. Unfortunately, this often leads to confusion and resentment even among real pilots, including myself.
Our SR22 and SR22TN will therefore be the first aircraft to be equipped with a technology I have been working on for the past two years which is fundamentally new in X-Plane – as the aircraft nears completion, I have the honor of introducing you to the results of this work in the coming weeks, which will also cover flight model, TKS and oxygen systems, but this week we will start with the engine – the Continental IO-550-N, delivering 310 hp at 2,700 RPM.
Why go beyond X-Plane’s engine model at all?
X-Plane’s piston engine model is great in being generic and it provides a good approximation of all relevant performance parameters for a wide range of different engines. However, at its core it is configured by only a handful of parameters and can therefore be quite unprecise in individual cases, sometimes large discrepancies in the combinations of power parameters can be found and the power curve does not fit every concrete model. It also does not reflect the dynamics and inertia of an internal combustion engine very well, and those of turbochargers practically not at all.
Based on scientific literature, I have succeeded in integrating an approach to simulate an aircraft piston engine in X-Plane, which maps the mass flows of air and fuel in each part of the engine in real time. Air enters through the air filter, flows through ducts, passes obstacles like the throttle plate, burns the fuel and leaves the engine as exhaust gas. Pressures and temperatures are calculated in each section, the system is modular and can map even complex induction systems like the one on the SR22TN. With the Tornado Alley turbo-normalizing system installed, the full performance capability of the engine model comes into play, as compressors, intercoolers, wastegate and turbines also have their places in the calculation of air flows and pressures.
The output is not simply made to fit, it requires many real input parameters such as the shape of the throttle plate or ducts or a turbocharger map for the TN, all of which have been carefully researched and integrated in months of work – but everything else just falls into place, finely tuned to match the documentation of the real aircraft within a few percent across the entire normal flight envelope. We have made no compromises here! Also regarding your framerate, the architecture is heavily multithreaded and has virtually no performance impact on X-Plane.
Does it have other advantages as well?
The biggest advantage of this approach is the fact that the masses of air and fuel are available at hand and therefore the air-fuel ratio in each individual cylinder. So it is known at all times whether fuel is able to burn at all and how efficiently. You will notice this when priming and starting, when flooding the engine or when leaning – the EGT of the cylinder with the first peak will decrease while all others are still increasing!
You will even have the possibility to turn some engine set screws which a mechanic in reality also has to adjust for example maximum fuel flow or manifold pressure target on the turbo-normalized.
Inertia and dynamics are directly visible in the evolutions of fuel flow and manifold pressure when moving the power lever, especially in the TN. Turbocharger speeds are calculated and they need time to accelerate – just like the wastegate does to compensate for you advancing that power a bit to quickly on takeoff and the resulting overboost by allowing parts of the exhaust to bypass the turbine!
The fuel system has been treated in the same way as the air system, from tanks to the injector nozzles. You will notice fuel sensors and strainers that are sensitive to bank. Fuel lines which take time to empty and fill, engine-driven and boost pumps with fuel pressures following real evolutions.
Since the model simulates the engine down to its smallest components, it offers the optimal conditions for a very fine wear and failure system. Just imagine, on a hot day with warm fuel, to quickly climb up to the flight levels and forget about the boost pump – vapor lock will certainly be waiting for you! Or think of an induction system leakage at FL250 which makes you lose all your manifold pressure, followed by a steep descent cooling down the engine and wearing out the cylinders – but thankfully the SR22’s propeller control is connected to the throttle lever, which limits engine speed to 1,900 RPM at low power settings.
There are so many more advantages to this you will still be able to discover yourself.
It has been a few weeks since the last update and we are excited to share all the progress we have made!
First off, we now have the SR22 3D model integrated and flying in-sim! This is a huge milestone for us, as this means we will soon be entering our closed beta stage.
We are also excited to announce that another developer has joined our team, Marius Bohn! Marius has been working on an engine model for the IO-550 for over a year, and we are in the process of integrating the custom engine model, custom oxygen system, custom anti-ice system, and more.
We have put together a preview of our current progress on the FMOD sound pack here:
This week, we will show previews of the interior and demonstrate the many features of the electrical system that is being simulated, even beyond the individual circuit breakers.
The electrical system is complex, but important to be accurate. We have simulated many different aspects of the system:
Battery 1 and 2
Alternator 1 and 2
Electrical Distribution Busses
Main Distribution Bus 1/2
Essential Distribution Bus
Main Bus 1/2/3
Essential Bus 1/2
A/C Bus 1/2
With the accurate representation of these many different busses (and associated circuit breakers), we can ensure a proper simulation of the avionics/systems in all the many different potential configurations imposed by mismanagement or failures – providing a robust platform to train upon.
Here is a diagram we are using in the system’s development, where the connections between distribution busses and general busses are shown in different colors.
After another week of hard work, we are excited to show some new screenshots and provide some more information regarding our development progress of the SR22 G3 GTS.
First off, we are excited to announce that the SR22TN G3 will come bundled with the SR22! The turbocharged variant of the SR22 will allow the option for faster cruise speeds and higher cruising altitudes.
TorqueSim and RealSimGear are excited to announce our next aircraft for X-Plane 11 – the SR22 G3 GTS!
The SR22 will be entering internal testing in the coming weeks, with a release to follow currently forecasted to be in late Q1 2020. The SR22 is the culmination of months of work to revamp all our development practices to ensure the highest level of fidelity and accuracy!
We will be posting more information about the SR22 weekly until release, make sure to follow our website to stay up to date!
G1000 Perspective customizations to the Laminar X1000
Synthetic Vision (using Saso Kiselkov’s Synthetic Vision, as implemented in HotStart’s TBM900 and TorqueSim’s Pocket Rocket)
Custom engine page and engine sidebar
Top-bar customizations (% Power, Distance, etc)
Custom boot sequence including “Know Your Limits” and fuel adjustments