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REFLEX XTR2 Simulator by Stefan Kunde


REFLEX XTR2 is my favorite simulator because it's realistic but not 'cluttered'. I'm an airplane guy and not especially helicopter savvy. So even though REFLEX is a top-notch helicopter simulator in the first place, I'll mention only its perhaps less noticed airplane capabilities, which are even top-notch as well.

The physics of a model are well rendered and it's easy to experiment with the parameters. I cope well with the kind of parameters, obviously unlike others. However, I have some tools to calculate the 'true' parameter values (see the pages on Brummi). With the REFLEX model construction program RMK we are able to render the appearance of a model very authentically (photo-realistic). Besides, there are also photo-realistic sceneries, made with the REFLEX scenery construction program RSK, in addition to the formerly customary scenery, created by the simulator, that still has some advantages and is shown here first:

customary scenery with airplane

This simple-looking REFLEX scenery is yet adjustable by parameter, for instance shape of terrain, covering by trees, clouds, and so on. Of course, weather and camera settings are also adjustable, but the default settings fit well. Maybe the most noteable feature is the changeable pilot's position including a mode 'following the model'. (Good it's only in the simulator.) That's not (technically) possible in the new, photo-realistic sceneries, though, because they are based upon a panorama picture shot from a fixed position:

MFG Klagenfurt - St. Johann im Rosental, Austria

This is St. Johann in Austria, the field of the MFG Klagenfurt. It's said the famous Hanno Prettner once practised here flying his aerobatic models. The scenery has been made by Horst Lenkeit, an independent author who unfortunately died too young. He also made the MFC Coesfeld scenery of a rural field with grass runways, well suited to thermalling:

MFC Coesfeld, Germany

The Mill Hill near Shoreham in England is a REFLEX stock scenery, one of those that are perfectly made to show a famous place to fly as well as the great features of REFLEX. As in reality, all aspects of slope soaring may be experienced, including downwash behind bushes, dynamic soaring in different wind speeds, and forced landings far below the pilot's position:

Mill Hill (Shoreham), United Kingdom

The same holds for the Hörnle (Teck) scenery, made by an independent author (Markus Vogt). It very well renders the location of the famous Teck slope soaring competitions in Germany, even though it's technically not quite as perfect as a stock scenery:

Hörnle (Teck), Germany

It has been even managed to create a water look-alike in REFLEX. So it's now possible to experience float and boat planes, as well as such helicopters, in their natural surroundings. The behavior on the 'water' is not quite realistic, yet shows the essence of water flying, for instance on a gravel pit lake in northern Germany:

A gravel pit lake in Germany

This scenery has been made by Harald Bendschneider, another independent author, who is expert in making sceneries for all of the 'big' simulators. He has a workshop and even offers help at his website www.Szenerien.de (well worth a visit). The sceneries made by Horst Lenkeit and other independent authors are ready for download at the RC-Sim website in the 'Download - Reflex - Scenes' section. There are more famous places in other sceneries, both by REFLEX and independent authors, for instance the summit of mount Gerlitzen in Austria, 6250 ft above sea level, the field of the TOC competitions near Las Vegas, or the AMA flying field in Muncie.

the pits in Muncie

This is the pits area in Muncie, with a model taxying in the forbidden zone. Most stock sceneries and even some sceneries made by independent authors have such forbidden zones. As shown in the picture, they are marked by red and white stripes if and when they are violated. If the model is below 20 feet altitude the simulation even stops. In the latest REFLEX version, these zones can be switched off because some people dreadfully complained about them. Don't be mislead, these zones are no problem at all because you won't even notice them once you mastered keeping orientation in the simulator and in the respective scenery. After all, you would not fly over the pits or other no-go zones in reality, either. Unfortunately, there was some campaigning against REFLEX using these zones as a pretense.

The scenery pictures also show examples of how realistic the models look in REFLEX by now. That holds not only for REFLEX stock models but also for those made by independent authors (like me, but others as well). Importance is attached not only to photo-realistic appearance but of course to realistic flight behaviour, too. Especially some models are so well behaved that they are suitable for beginners, so these might learn to fly in the simulator.

Some models are even delivered with their genuine sound. Often we're in the dark about the authors of the sound files since there is still no 'market' especially for model sounds. Besides, the latest REFLEX version has really improved sound including wind noise in the sceneries and the whistling noise of vortices on models. There are only standard sounds for different model classes so far, but there is still no program for creating more of the new quality sounds.

Stefan Kunde, author of REFLEX, once wrote for the FAQ of RC-Sim: »Flight behaviour is essentially determined by the .par file. It contains all model and physical parameters. The .mod file actually determines only the appearance. Experience shows that, despite an objectively identical flight behaviour, on account of a different model appearance a subjectively different flight behaviour will be perceived. Besides, only the positions of rotors, propellers and landing gears (at ground contact) influence flight behaviour.« (translated literally) I could only emphasize this statement.

That's just why I'm aiming not only at a correct rendering of my models' flight behaviour. Little by little I also copied their appearance as detailed and realistic as possible, as far as that is practicable in RMK and noticeable in REFLEX. I'm still amazed again and again at how far even the drive sound influences the perception of a model's flight behaviour. So for building a REFLEX model are needed 1) measurement and calculation of parameters, 2) reproducing the appearance of the model in RMK and 3) recording the drive's sound. Finally it's again stunning how realistic the flight experience is in REFLEX.

Brummi Miss 2 Super Miss
threedee400 Pedro Thermik-Star

My first two models, Pedro by Graupner and Brummi by Multiplex, are described at some length on special pages (in German) (Pedro, Brummi, see also the menu on the left side, topic 'Model Aircraft...'). The threedee400 has a special page (in German) as well (threedee400). That was my first model for REFLEX with ribs-and-spars structure and textures. Quite a lot of work and time is needed till rendering is really good. Super Miss (like Miss 2) is simply derived from Brummi so there is only a description of the REFLEX model (see also the menu on the left margin, topic 'Simulators...'). Like my other real models, also Thermik-Star is described on a special page in German (Thermik-Star). Its flight behaviour is very pleasant and very well rendered in REFLEX.

You may notice that I'm offering parkflyers und gliders in the first place, all having an electric drive. They are well suited to learn flying, from the beginning (Slow Stick, Miss 2, Brummi, Pedro) to aileron usage (Super Miss, Thermik-Star) and to aerobatics (threedee400, Jitterbug) and thermalling (Pedro, Thermik-Star). The individual descriptions (see also the menu on the left margin, topic 'Simulators...', subtopic 'REFLEX') and the demo flights should be an inspiration. Explicit questions on that topic I would answer by e-mail (please click on my name on the left side). Please read the text file belonging to each model (ModelName.txt)!

Of course, my REFLEX models render 'only' special real models in a special configuration (trim, drive). Rendering is very realistic, though, and they are each very 'typical' of a certain class of models. Eventually they are very well suited to learn model flying exclusively in the simulator. It's not absolutely necessary to use certain other, own models for that purpose. You even should learn using several different models. Once you are really able to fly at all, you may get yourself your favorite model. You will then be able to control it also in reality, without previously practising with exactly this model in the simulator. Only a 'professional' would possibly need exactly 'his' model in REFLEX e.g. to practise difficult patterns. But even then one would mostly do with a 'standard' model.

On this subject, "Learn model flying with a simulator and especially with REFLEX XTR", I have compiled frequently asked questions and my answers on them in a quite long text. If you are interested look here to read or download it.

VEBF with rudder and throttle only VEBF also with elevator VEBF also with ailerons/flaperons

Additionally, in REFLEX I recreated a very simple model which I used to learn flying in the 1960s. Nowadays and in the simulator you would of course use the aileron version to begin with. You might be surprised how calm the model will stay even in wind and gusts and how unhurried but directly it responds to control inputs. The versions without ailerons or even with only rudder and throttle not only show how it was in the old days but also how a model will respond to subtle trim changes. An interesting learning example! You may download the installer for this model, named VEBF, here. A comprehensive description will be found in the menu 'Program Files-REFLEX-models'. Demo flights (hit F9 in REFLEX) will show typical flight behavior of the three versions.

Jitterbug Slow Stick Vought V-173
Das Ugly Stik Kwik-Fli Mk III Brushfire

Several models followed that I don't have in reality. They have been built using only information from the Internet and sometimes plans and articles kindly sent to me by fellow modelers. I built the Jitterbug just because I like her so much and because she's flying so well. There was a request for the GWS Slow Stick by a fellow modeler, and the model is fascinating due to its simplistic and effective design. V-173 was a project in the RC Groups Simulator forum (here). We tried out how realistic the rendering of such an unusual configuration could be in REFLEX (result: quite good). Das Ugly Stik is a great classic brought out 1966. I wanted to see how flying was in those old days (nearly as today, classics are just ageless). The same holds for Kwik-Fli Mark III, 1967 pattern world-champion model. Brushfire has been designed in 1978 and is simply a very good classic 'ballistic' pattern model.

Senior Telemaster Giant Telemaster Kazmirski Simla

Senior Telemaster is just another classic, brought out 1968 and well-known world-wide. Giant Telemaster is a modern - well, giant version having interesting flight characteristics. Eventually, a hardly known design of the all the more known Ed Kazmirski was reconstructed: Simla (for an RC Universe thread, here).

Blkow Bo 208 'Junior' Bergfalke II/55 MDM-1 Fox

By now I'm interested also in scale models if the originals are an interesting design. That's true for the Bölkow Junior and the Bergfalke, both vintage airplanes today, but also for the Fox as a modern aerobatic glider.

M.F.I. MFI-9 'Junior' M.F.I. MFI-9 'Junior' M.F.I. MFI-9 'Junior'
Senior Telemaster Giant Telemaster Middle Stick

Finally I badly wanted to have the Junior on floats, what even worked. After that, both Telemasters and the Middle Stick have been put on floats as well, followed by even more models. The Junior has been even put on skis for winter sceneries.

The definition files of most of my REFLEX models are each packaged in an own installer program. Most of them are quite big, but after downloading one of them you can simply run it and select models to install. My download page (see menu on the left side) presents all these files and some more, including RMK objects, sounds, and parameter calculations.

Of course, you will find the greatest number of models, both airplanes and helicopters, at the RC-Sim website. There is a vast variety of model types, including most of my models, even though the latest version is always at my download page. Not at RC-Sim, though, you'll find some of the finest airplane models for REFLEX, so you absolutely should visit the W3 Group website. The following pictures give an overview of even more interesting models for REFLEX:

KYOSHO Concept 30 Jet Ranger on floats (Eric Fague) Graupner Taxi (Bo Strömberg) Graupner Taxi on floats (Bo Strömberg)
Great Planes® Ultra Sport 40 (W3 Group) ZNLINE Intégral (Vichineu) Goldberg® Piper Cub (W3 Group)
Bf 109 G 1:5 (W3 Group) Pilatus PC-6 Turbo Porter (Ingo Fischer, Torsten Wolf) Robin DR 400 (Urs Stocker)
Bellanca Super Decathlon (Ingo Fischer) Zlin Z-526AFS (Janning Quint) Zlin Z-50LS (Gerd Gunzenhauser)
Sukhoi Su-26M (Gerd Gunzenhauser) Zivko EDGE 540 (Gerd Gunzenhauser) Extra EA-300S (Gerd Gunzenhauser)
AT-6 Texan (Janning Quint) Fouga CM.170 Magister (Jürgen Dreyer) AERO L-39 (Gerd Gunzenhauser)
BAe Hawk T.1 (Eric Fague) Junkers Ju 52/3m (Jürgen Dreyer) Douglas DC-3 (Vichineu)
Lockheed C-130 Hercules (Jürgen Dreyer) Douglas DC-9 (Jürgen Dreyer) Airbus A318 (Jürgen Dreyer)

By the way, REFLEX is able to do 3D, not only flying, but also display rendering. It calculates not only two coordinates for the screen picture, but creates the third, the 'Z coordinate', too. If the PC has a modern graphics adapter with 256 MB or even better 512 MB dedicated (not mapped) video RAM, REFLEX is 3D capable. Using appropriate 3D glasses can give a real spatial impression when flying in REFLEX. The glasses may be annoying and the eyes are stressed, but it may be useful, especially when flying close by, for instance flying 3D with a helicopter or airplane, or when slope soaring.

3D mode (red-cyan)

So far only the customary scenery, shown first above, was 3D capable, but the photo-realistic sceneries are now 3D capable as well. Most of the stock sceneries have been even improved especially for 3D. An appropriate graphics driver, together with simple red-cyan (or red-green) glasses, even allows 3D display using any type of monitor (that means also the usual TFT flat screens). That's far better than a few years ago since the picture is no longer tinged with some color. The display looks really three-dimensional, but it's rather dark and all colors become grey. Besides, your eyes will be stressed so for instance nVidia always recommended it only for trying, to spark interest in the 'real' thing.

Indeed, 3D display may be more useful with an expensive conventional (CRT) monitor or one of the new fast flat (TFT) displays. The graphics adapter should be twice as fast as normal for the 3D shutter glasses, which are plugged into an USB port. They alternately shut the glass for the left and right eye. Using a usual TFT monitor or a notebook PC, 3D with shutter glasses is still impossible because they are too 'slow'. The PC's graphics performance should be really high since the amount of 3D effect also depends on screen resolution. And the monitor has to achieve at least 120 Hz refresh rate at the desired resolution (60 Hz for each eye), or the picture will flicker too much. And it's still a bit darker.

Considering the expensive display and the still annoying shutter glasses, an autostereo display (no glasses needed) seems to be a better alternative (see Stereo3D). These devices are getting comparable in price to the expensive CRT monitors. Even though red-blue (anaglyph) glasses are much cheaper, I'm in doubt if 3D in REFLEX is actually worth the effort. Personally, I find 3D 'cool' but too stressful for my old eyes. I'm flying airplanes but no 3D and thus prefer the bright and brilliant 'flat' display to the darker and dull 3D one. And 3D has been just a periodical 'hype' for quite a while now. But to each his own!


2011-03-01  © Burkhard Erdlenbruch

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