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  1. #1
    Usuario Foroaviones
    29 jun, 13
    Arafo, Tenerife, Canary Islands, Spain

    DCS: W L-39 Albatros Team

    L-39 update

    ED Forums - View Single Post - Virtual Patriots - L-39 Project
    *Quick Update*

    A lot of work has been going on lately, but I don't always find the time to update this thread with everything I would want to say.

    Collision Model

    The collision model was recreated from scratch with animation and visibility arguments and was tied to the damage list.

    Each section you see here will affect the flight model should damage or loss occur to the piece. If the right wing is lost, a quick left roll will begin due to asymmetric lift. If the horizontal tail is lost, pitch control will be lost and the aircraft may pitch violently up or down. If the vertical tail lost, directional control is lost. Each piece, even individual gear or wingtip tanks, cause their own drag. Losing a canopy will affect flight control and cause massive drag increases.

    Random Failures

    Work has begun on simulating random failures. While I have an idea how I want these to work, I won't go into details, yet. However, I know that I would like you guys to have more control over which types of failures you are likely to see during your training or combat flights. Because the L-39 is a trainer aircraft, it seemed fitting to allow more control of these settings. While the instructor pilot in the rear seat will be able to fail instruments and electrical systems manually, some things like mechanical, hydraulic, and engine failures cannot be simulated.

    Failures only occur when the Random System Failures option is set on in the MISC options menu. While each individual pilot sets these options for their own flights, they are also saved to tracks and missions and forced on clients to ensure fair play and robust tracks.

    Sliders for failure rates will operate as follows:

    0% = No chance of occurring
    1% = (1/100)X of Normal Rate
    50% = Normal Rate
    100% = 100X Normal Rate

    Here is a snapshot of the current options menu:

    As you can see, you can choose whether to include a rear seat pilot or not. While this will show a physical model of the rear pilot, it will also add 80kg to your weight. This option may go away when multi-seat capability is possible in multiplayer.

    New Wingtip Options and Other Visual Options

    Let's face it! Not every L-39 is created equal. There are so many variations even within the C civilian model, with some owners modifying their aircraft to reduce their weight by that last ounce, or squeeze a little more top speed out of the jet by changing wingtip types.

    We have new wingtip types that can be set by the skin creator in the description lua file through arguments. These changes are not only visual, but also affect the weight and drag of the aircraft, even improving roll rate in some cases.

    Options the skin creator has available:
    L-39 Variant (C or ZA) This option is included in the skin creation as our C and ZA model share the same model and certain features are activated by this argument
    Civilian Variant (Civilian, Aerobatic, Racer) C model can choose performance with this argument
    Wingtip Type: Tanks, Sculpted, Curved Winglet, Double Winglet (Changing to another wingtip type will improve speed by about 25 km/h and lowers weight on the tips of the wing by 32 kg)
    Rear Seat (Turning off the rear seat will make it visually disappear, but it will also save 85kg of weight)

    Currently, we are only showing the sculpted wingtips:

    There is a lot more development not mentioned here, but I thought this would keep you guys up to date.

  2. #2
    Usuario Foroaviones
    29 jun, 13
    Arafo, Tenerife, Canary Islands, Spain
    Interesante update del L-39 y lo que ellos llamas Advanced Turbofan Engine Model (ATEM).

    ED Forums - View Single Post - Virtual Patriots - L-39 Project
    Time for a new year's update on the L-39. Work has been continuing, even without status updates to this topic, so no need to worry about this project being on hold.

    Hydraulic System Implemented
    Main and Emergency Hydraulic Circuits
    Main Hydraulic Pump Pressurization from engine bleed air
    Interconnect Valving and logic
    Hydraulic pressure consumers: Gear, Gear Doors, Flaps, Ram Air Turbine, Wheel brakes, Speed brakes (main system only)
    Emergency Extension Levers for Gear, Flaps, and Ram Air Turbine
    Emergency Brake Lever

    Random failures code was started, but has been put on hold for now
    Fixed several major bugs (for ex: Engine would shut off during air starts)

    Advanced Flight Model
    Tweaks to Yaw Stability and Rudder Effectiveness

    Advanced Turbofan Engine Model
    I began work on this new fully dynamic engine model back in October, but it has not been implemented into the simulator at this point, so many things are still subject to change. However, I thought I would pass along some details about the planned features of this new turbofan engine model for the L-39. So far, I have written the entire engine model into a standalone program that runs at the same frequency as the DCS flight model and reads my throttle inputs in real time to simulate realistic dynamic conditions. I also view the output of the engine conditions in real time in several performance graphs.
    Improved Thermodynamic Model that accounts for enthalpy changes across each subsection of the engine given inefficiencies and current dynamic conditions
    Inertial Twin Spool Rotor Modeling
    Aerodynamic blade drag for each compressor/turbine stage
    Fuel Governor with a simple control algorithm to maintain sufficient fuel pressure at varying altitudes and airspeeds
    Compressor/Turbine Efficiency Curves based on airflow and rotor speed
    Two Anti-Surge Bleed Valves affect performance of the engine in the specified ranges for the L-39
    Combustion efficiency dependent on Fuel/Air ratio
    Air-starter Modeling of initial engine spool up
    Light-off produces correct RPM acceleration and combustion allows for self-sustaining idle conditions

    An example output from a slam acceleration/deceleration test in an early version of engine and fuel controller.
    Un ejemplo del ATEM

  3. #3
    Usuario Foroaviones
    29 jun, 13
    Arafo, Tenerife, Canary Islands, Spain
    Nuevas imagenes del L-39 sobre EDGE

    EDGE model test.



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