DCS: F-15C

[Minoslas]

F-15 AFM update:

Noticias del AFM del F-15C

http://forums.eagle.ru/showthread.php?t=117395

A little F-15C AFM update - 7 December 2013

We've been hard at work on the new advanced flight model for the F-15C and each day we are getting a little closer. Unlike past AFM projects, this one has been a little different because of the characteristics of the Control Augmentation System (CAS). In particular how yaw, pitch and roll are blended under different flight conditions. In fact, to better help debug the system, we now have the ability to manually toggle each of the three CAS channels off and on (as indicated on the caution and warning panel). The flight characteristic differences are quite dramatic! Before this could happen though, there was a lot of tuning of the center of gravity of the aircraft. This has a huge affect on pitch and takeoff/landing performance. We are now at the stage of tuning the CAS blending to give the DCS Eagle its unique feel based on feedback from our Eagle driver SME and a large number of performance benchmarks. In fact, our F-15 SME had commented that the DCS F-15C has superior flight modeling in many ways to the 3 million dollar trainer. I think many of you will be quite surprised how maneuverable the Eagle can be at slow speeds and high angles of attacks. With the huge rudders, it can perform all sorts of awesome at slow speeds using a lot of rudder input. We've also added separate wheel brake axis this week for the Eagle.

In several ways, this work will act as a foundation for future DCS aircraft AFMs.

As mentioned in an earlier message though, this work has equated to more time and this project will not be ready in time to be released with the 1.2.7 update. However, we think the additional work / time will be well worth the wait.

In regards to AFM, this is how we generally define it:

The aircraft's dynamics are always calculated on the basis of the same physics equations describing translational and rotational motion of a solid body under the influence of external forces and moments disregarding the nature of their origin.

The center-of-gravity can change its location within the speed axis system.

When calculating aerodynamics characteristics, the plane is represented as a combination of airframe components (fuselage, outer wing panel, stabilizer, etc). Separate calculations of aerodynamics characteristics are performed for each of the above named components in the entire range of local angles of attack and sliding (including super-critical), local dynamic pressure and Mach number taking into consideration deviation and grade of destruction of control instruments and some airframe components.

This is the basic definition, but not limited to, what we use to define a DCS aircraft with an AFM. Further detail can be added to include dynamic engine operation, sub-system modeling, fluid dynamics, and damage modeling. None of this must equate to a mouse-clickable cockpit. As such, the definition of an AFM can be a bit broad and encompass products ranging from the the Su-25T to the A-10C.


Matt

[Minoslas]

Belsimtek F-15C AFM

http://www.belsimtek.com/news/1459/

BelSimTek Nearing Completion of F-15C Advanced Flight and Engine Models
The original F-15C flight model currently featured in DCS was developed over a decade ago and represents an earlier generation of simulation technology. Despite demonstrating generally correct aerodynamic performance under normal flight conditions and providing great gameplay, current user expectations, available computer power, and developer expertise demand a higher level of fidelity. As a result, a comprehensive advanced flight model of the primary U.S. jet fighter, the F-15C Eagle, has been under development for DCS.

The complete aerodynamics model accounts for mass, force, and moment interactions of the aircraft’s elements as subjected to airflow. Unlike the previous model, which regarded the aircraft as a single point of focus, the new flight model consists of individual aircraft elements carefully tuned to reflect their unique aerodynamic characteristics and joined together to determine the sum vector of the airframe’s momentum.

Over a year a hard work has gone into the development of this model and now it is finally ready for initial external testing. The primary element of the new model is accurate aerodynamic performance that closely matches the characteristics of the real F-15C Eagle throughout the flight envelope, including in critical angles of attack, stalls, and spins. Maneuverability characteristics are also correctly modeled throughout the flight envelope, providing accurate performance in acceleration, available sustained G, maximum airspeeds, maximum altitudes and other characteristics.

Of course even real aircraft differ somewhat from their documented performance characteristics due to slight individual variability, but we have made every effort to ensure you are truly immersed in the experience of driving – without a doubt – one of the best fighters of the 20th century.

In addition to the aerodynamics model, the flight model includes a new engine model, based on the F100-PW-220 engine with increased dry and afterburner thrust. The model accounts for inverted and negative G flight effects and features a special afterburner component model. The flight model also includes a new fuel system model as well as nosewheel steering and wheel brake component models.

Special attention was paid to accurately recreate the design of the F-15C flight control system, including Pitch Ratio control adjusted for airspeed and altitude, Aileron/Rudder Interconnect (ARI), Control Augmentation System (CAS), Attitude and Altitude autopilots, and the Pitch Trim Compensator (PTC).

The new model significantly improves the entire flying experience, making special flight conditions like air to air refueling, landing, and edge of the envelope flying far more dynamic, exciting, and even more challenging. Straight and level flight no longer feels like “flying on rails” while maneuvering flight provides a sensation of the power and control in your hands.

At this stage of development, we can confidently provide a highly accurate aerodynamics model of the F-15C accompanied by a partly reproduced systems model.

The estimated release date of the new flight model for F-15C Eagle DCS module is late March, 2014.

[Minoslas]

ED join DCS: F-15C Eagle to your product list.
http://www.digitalcombatsimulator.co...roducts/eagle/

[Minoslas]

FC-3 F-15C segregate module available:
http://www.digitalcombatsimulator.co...roducts/eagle/