Purito ARTF 2m Gliders/Electric RES
Description
The Purito is probably the best regarded and best performing 2m RES model currently available. Although the design is a few years old now none of the more recent contenders (e.g. the Encanto, the Vinceres or the Eli) have been shown to perform any better in contests worldwide.
These models have been built and covered with Oralight to the highest standards by a professional builder. It is very hard for an amateur builder to achieve this quality.
The Purito is a direct descendant of the Pures and the Slight, and Stefan Schweiger has optimised the design as far as possible with current CNC technology. The main design change is to a lower aspect ratio wing to increase the Reynolds Number and give better overall performance and particularly nice handling. Despite the larger wing the weight has been kept the same, resulting in a lower wing loading and excellent performance in weak conditions.
The Purito flies like a homesick angel and despite its light weight the model has a surprisingly good speed range. As Greg wrote in the RCGroups thread "The big wing bestows a good launch, even when the wind is light; the airplane itself has little drag, so displays very good legs; handling is easy, allowing the pilot to concentrate on thermalling; and finally, the spoilers really make spot landings quite easy."
The amazing wing is the major improvement of this design. The main spar is a substantial carbon tube which gives the structure excellent rigidity. A multitude of ribs are threaded over this tube to give the airfoil shape. This is even better maintained over the critical front portion by utilising two sub-ribs between each full rib, almost eliminating covering sag, and reducing drag appreciably. Becuse the tubular spar is inset below the covering surface there isn't a discontinuity at the spar line which is great feature - this usually trips the boundary layer and causes extra drag.
The kit is beatifully made up with excellently CNC cut balsa and ply parts. The wing is built over/in a 3D jig which ensures all the ribs are perfectly placed and aligned. This can be seen in the clear photos in the English build manual. In addition to the manual, full size plans are povided for the tail surfaces. Also see the RCGroups Purito thread for detailed build info. Also use Google Translate on this very useful RC-Network.de Purito thread. Before building please checkout this link to the latest manuals and translations.
See the Purito and Purito Electric product pages for more info and photos of the kit.
| Purito ARTF Electric Specifications | ||
|---|---|---|
| Wing span | 2.0 m | 78 in |
| Wing area | 39.7 dm2 | 615 sq in |
| Length | 119 cm | 46.9 in |
| Flying weight from | 463 g | 16.3 oz |
| Wing loading | 11.7 g/dm2 | 3.8 oz/sq ft |
| Aspect ratio | 10.0 | |
| Wing airfoil | AG35-38 modified | |
| Dihedral (EDA) | 12.0º | |
| Spinner Diameter | 30 mm | |
| Centre of Gravity | 75-80 mm from wing leading edge | |
| Controls | Rudder, elevator, spoilers, throttle | |
| Recommended RC | |
|---|---|
| Rudder & elevator servos | Blue Bird BMS-101DMG, Blue Bird BMS-101HV, Blue Bird BMS-A10H, CHA DS06, CHA LV06, CHA HV06, KST X06, Graupner DES 427, ES08 |
| Spoiler servos (2) | Blue Bird BMS-101DMG, Blue Bird BMS-101HV, KST X06H, CHA DS06, CHA LV06H, CHA HV06H, Graupner DES 427, ES08 |
| Receiver | 4 or 5 channel receiver to match your transmitter |
| Battery | 2S 400-600mAh LiPo, 3S 400-600mAh LiPo |
| ESC | Dualsky SUMMIT 30 SLIM 6V, Dualsky SUMMIT 30 SLIM 8V |
| Control Throws | |
|---|---|
| Rudder | 20 mm each way |
| Elevator | 10 mm up & down |
| Spoilers | 80º - 90º up |
| Electric Powertrain Recommendations | |
|---|---|
| Hacker A10-7L 4.4:1 | 3S 450mAh LiPo, 12x8, 13x8 |
| Purito ARTF Electric Typical Weights | ||
|---|---|---|
| Wing centre panel | 102 g | 3.6 oz |
| Wing tip panels | 109 g | 3.8 oz |
| Fuselage | 94 g | 3.3 oz |
| Fin | 7 g | 0.2 oz |
| Tailplane | 11 g | 0.4 oz |
| Accessories | 10 g | 0.4 oz |
| Total structure | 333 g | 11.7 oz |
| Receiver | 6 g | 0.2 oz |
| Rudder servo | 5 g | 0.2 oz |
| Elevator servo | 5 g | 0.2 oz |
| Spoiler servos | 10 g | 0.4 oz |
| Motor | 40 g | 1.4 oz |
| Prop & spinner | 17 g | 0.6 oz |
| ESC | 7 g | 0.2 oz |
| Battery | 40 g | 1.4 oz |
| Flying weight | 463 g | 16.3 oz |
Reviews 2
The plane launches higher than other F3L planes I have. Workman ship was great. On the pre build plane I purchased. The spoiler position allows for great landing and control. I have ordered another purito. I would recommend the purchase of the Purito F3L sailplane,, it’s great to fly!
As a glider the Purito lives up to its excellent reputation. I've only had a handful of flying sessions since fitting it out, but everything so far has been extremely encouraging. Launches are very good, float in light conditions goes on and on, yet it is more than responsive enough on 1s voltage.
I needed a fast replacement for the unexpected loss of my previous F3L glider, so purchased this ARTF version rather than the kit. The quality of making and covering is superb, all I had to do was fit my Rx and servos and install the pushrods for the tail parts etc.
I originally fitted a small 2s 350mAh lipo but found the servo speed and torque unnecessarily high which upset my flying style, and the capacity drainage too fast. So I returned to a 1s 750mAh which I'd always used on my past F3L gliders, now the Purito flies much better (for me) and the capacity is more than enough for a long half-day's flying.
Bare weight was 415g, plus 15g in the nose (for a 73mm CG) gives 430g flying.
Made ballast for the wing-spar which increases this by 40g, 70g or 100g (each incl 10g spacer set) but not yet needed to use this.
Very pleased.
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