Bulls or sheep? Ok... Bulls issue. Sky Country Discovery-2
It has been a long time since we were thinking of a test fly of this glider. At first we didn't have it, then we had it but we were too busy with other test flights. And then the weather was bad. Then we had good weather, but we wanted to fly ourselves and we flew other gliders. Then we were lazy, yet we had couple test rides on it anyway. Then we were not lazy anymore, but we have lost some test results which were done before already.
SC Discovery-2, 30 m2, 100-120kg weight range. We were using our harnesses AVAsport Sprinter and Edel RX2000. Wing loading was from one third to two thirds of weight range.
D_I_M: The design is simple with some innovations. The risers look handmade and feel unpleasant in the hands. Fat aramide lines are мейд in Feodosia, Ukraine. There are big carabiners on the line attachments, but that's all for negative impressions. The glider is мейд from a good very durable material that isn't too heavy. The internal design is well done, and in some places even smarter than the same level gliders of well-known companies. The speed bar system is not too simple and it has quite a short travel.
Theoretic: Interesting combination of reasoning and good quality. You can see right away that this glider is not Western maid. The canopy looks modern and sporty and has a closed section somewhere in the middle of each side of the wings; it makes you think about a guinea-pig's advanced flight characteristics. There are many sections for this level of a glider, but there aren't too many lines. Its wing surface is quite smooth, but there are some little wrinkles on it. The sewing and cutting looks like it was мейд well. The colour of the wing itself looks pleasant, but reminds me of some MAC ParaTechnology gliders.
Theoretic: D2 paraglider behavior depends on material and size. Sizes x27,28 and 30 (governor) comes up easier than size 29. Size 29 comes up good, but a little bit sluggish and it has some tendency to not come all the way up. Small sizes (24) мейд for governor, also might come up relatively sluggish.
D_I_M: Big sizes do not have any problem. They come up smooth and solid with no 'dead points' on the way, but there is another opinion about the small sizes. They have a tendency do not come up all of the way. This is not my opinion because I am too heavy for flying small sizes. Ground handling would not tell me much too because it feels like kite to me.
Theoretic: Once again, the glider behavior definitely depends on its size. Big sizes (27 m2 and bigger) are easy to launch, even too easy. They quickly take load, accept different launching techniques and are quite forgivable of pilot mistakes, but size 24 (governor) sometimes needs a special launching technique and if pilot doesn't pull hard enough, the wing comes up slow and has a tendency to fall down again. The behavior of D2 with its large size is great in strong wind conditions: it doesn't attempt to pull a pilot out from the ground, but works gusts out smoothly. D2 could be easily put on one 'ear' and brought back up again.
D_I_M: There is a slight tendency towards an unstable direction, but not crucial for the safety. The wing steers well with its breaks and weight, and works out cable-yanking well.
Theoretic: Comfortable. While towing D2-30 comes back gently and flies fast. A little bit more than average for intermediate glider, and there is no aggressiveness at all. The glider behaves calm and with dignity. Steering with weight is normal. Steering with breaks is also normal; a little bit lower than average, but it's quite enough for fixing direction fast. After releasing, the surge is long, yet not significant. I flew this one, yet only on a plain using winches.
D_I_M: We used different harnesses with this wing. Sprinter is a спорт harness which is more sensitive than other harnesses; its weight-shift steering ability is better than average.
Theoretic: D2 utterly polite and precautionary, even in dangerous situations. Flying D2-30 with normal wing loading doesn't feels like it has much feedback at first, but after flying for a while, you start feeling it. In turbulence, the canopy does not jump from side to side above the head; all movements are insignificant. This wing makes you fly smooth and easy; you have to just to find a rhythm of the dialog.
Alaska: my general impression. The break travel is all the way through the хэнд movement range and their effectiveness stays almost the same at any position. Maneuverability is one of the best for this class, which allows you turn as sharp as you want without sliding or jumping. It is very easy to change the turn radius. Feedback is just super without aggressiveness and not too slow. The canopy very gently informs you about all air instabilities. For some people the glider could seem to have little of feedback, but for me personally, flying in strong thermals is pleasant (the glider doesn't shakes too much) just as flying in the weak weather is too; there is enough of feedback to not miss weak thermals.
D_I_M: D2 does not have plenty of maneuverability, but at the same time its controls easily and solidly. Its turn behavior is balanced and not complicated. There are not many of the same class of gliders that can compete in maneuverability with it. Controllability of the D2 stays the same all the way through the break travel. Applying the breaks often does not make the glider sink too much, which is good for flying slowly in weak thermals. High speed thermaling is not as good as slow speed for this glider, but it is still alright. A D2 cool trick is to spin the glider when you enter the thermal, but this is for special lovers.
Flying with accelerator.
D_I_M: The accelerator is very effective. Speed increase is more than 15km/h. Not every high performance glider has such an accelerator. The stability remains good if you fold a little ear and it opens by itself. The sink rate increases of course, but the glider doesn't seem to go down too much.
Theoretic: it's very good. The sink rate is about -3.5. And the leading edge looks solid.
Небезопасные режимы полёта
D_I_M: One of the things I like this wing for is its asymmetrical deflation. All previous sweets you can find on any other gliders. Flying my old Revolution and using the accelerator is at least a little better. My Proksy is more maneuverable and has much more feedback. The Ozone Vibe is simpler when it turns, but not on any other wing except the D2 because I could collapse half of the wing, hold onto it for two seconds while flying straight at the same time, and then make a sharp turn opposite into deflation, and without stalling the flying side. If I say I was surprised, it means to say nothing. Even school gliders do not forgive such things. What else can I say? If you do nothing during deflation, the wing will open by itself with a slight pitch.
Theoretic: it's excellent! The most important thing is that the glider has basically the same behavior from 45-50 to 65-70% deflation, and that is rare. Anyway, the glider is very predictable and quite calm. If the pilot does nothing during the exit from deflation, the glider will make a 90 to 180 degree turn, and then open smoothly without jumping all over your head. The break and weight compensation is better than average. It is easy to keep straight flight even with 50% deflation. The descent before deflation is about average or lower.
Alaska: When 50-60% of canopy is deflated, the wing gives you about one second for thinking, then it gently dives in a spiral while opening smoothly. It comes out in one turn. If you start compensating during deflation, the wing will start turning out of deflation.
D_I_M: Massive deflation, instant inflation, height loss is insignificant.
Theoretic: no problem; classic. There is an obvious breaking phase as the glider surges back at 30 degrees. Inflation starts when the canopy has not returned to the overhead position. The inflation is fast yet smooth, and the surge is less than average (about 30 degrees). Height loss is minimal.
Imitation of asymmetric stall while thermaling, without letting the spin to develop.
D_I_M: One more peculiarity. The stall is just perfect! We have special methods to make such stalls very nasty, but the glider comes out with an almost straight surge. Even if the canopy dives too fast, and pilot cannot not stop it at the right time, it folds its leading edge a little bit and then stops on the horizon and opens softly; very nice. The stall develops slowly and softly with lots of ear deformation. To miss this moment is almost impossible. The loss of loading on the break is not sporadic, but continuous.
Theoretic: Perfect! I'd say the D2-30's behavior in such situation is the best from all the gliders I have ever tried. The inside break load is a little bit lighter than average, but still not comfortable, even warning. The entrance into the stall is followed by a well-marked inside break loading loss, smooth turn acceleration and very noticeable canopy deformation. At the same time, the glider lets you keep the stall for about half of the turn without difficulties, while recovering. Even after half of the turn exit, it remains smooth, comfortable and predictable. The surge was usually not more than 30-35 degrees, and the glider was not loosing the thermal.
Alaska: In order to cause a spin, you must try hard as the wing resists for a long time, even if one of the sides is all wry, but glider still flying. You can release the break at any moment, my wing wasn't able to surge lower then horizon not even a single time. At first glider jumps out from the developed spin pretty fast, but then follows straight smooth surge. Considering the way this wing acts in spin, it belongs to the calmest gliders (first SC Discovery2 no one gets even close, then Aeros Style, Aeros Select but entering the spin, Airea Rebel)
Theoretic: Easy and comfortable to do.Glider starts to dive at medium speed and behave smooth and predictable, the usage of inside brake is slightly more then usual. Glider keeps sufficient maneuverability with sink rate more then -10m/s, tendency to spiral stability wasn't found. Exit is not very fast, but smooth and solid,takes about half a turn.Surge and then following pitch needs minimal compensation.
D_I_M: Very effective, sinking at 8.5 m/s could be reached without a problem. Canopy keeps stable. Exit is fast and simple. Parachutal stall found by Theoretic was not found by me, despite the fact that I tried to find it. May be, my 8 kilos more weight was the reason. But also, maybe I wasn't releasing B risers slow enough. Anyway, parashutal stall was found by Theoretic's, and my recommendation is very simple release B risers very quickly, and be ready to use a speed bar in order to avoid parachutal stall.
Theoretic: The entrance is fast, the canopy more energetically then average going back and stay there, at the same time transferring from gliding to almost vertical descending, after that follows two-three small pitches and B-stall becomes stable. B-stall is very effective; sink rate for D-2 was more then -8m/s. At such sinking glider was very stable, and kept shape well. B-risers resistance is noticeably lower than average, it is not hard to hold them at beginning and during B-stall.
Theoretic: Very good. Easy to perform, glider is stable. Effectiveness is medium sinking is about -2...2,5 m/s. Ears opens without additional actions, at the same time glider stays very stable. Pilot can help canopy to recover by brakes if he wants.
D_I_M: Discovery 2 is a perfect glider. Only for its friendly behavior in asymmetric collapse and asymmetric stall, it's deserve the best rates, despite of the class. However, combination of the best safety with excellent performance makes this glider absolute leader of my personal preferences in Advance Intermediate class. Maximum speed is practically unreachable for other gliders in the same class. And the price! What a nice surprise!
Theoretic: D2-is a very good glider for most pilots. I mean for pilots who already finished the school, flies on weekends, does not have too much of total air time and have some спорт ambitions. Wonderful flight characteristics in combination with good maneuverability and forgiveness make this glider perfect for incredible XC flights and some acro, in the mountains with its strong weather as well as on the plain with its complicated weak thermals. Everywhere D2 will show it self nicely.
Alaska: Soft feedback, perfect control and flight characteristics, very safe. D2 is one of the best universal gliders for any flyable weather for pilot with 10 to 150-200 hours of air time.
Special thanks to Alex Martynov aka Ilich 2-nd the owner of tested wing.
Special thanks to Denis and Tonya Roumiansevi (firstname.lastname@example.org) for translation with David Fletcher as consultant.
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