Purito ARTF 2m Gliders/Electric RES

These almost ready to fly Purito ARTF models save hundreds of hours of laborious construction and are a godsend to all those who want to fly top level competitive F3L and F5L contests but do not have the time and patience necessary to build one from a kit. These wonderful models are available in glider (F3L) and electric (F5L) versions.

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.

Some of the models have our Compression Contact Wing Connectors ready installed on the wing underside and the fuselage so the spoiler servos' electrical connection is made automatically when assembling the wing onto the fuselage. Use good quality 2.5cm (1") wide clear sticky tape to hinge the control surfaces.

The Purito is a direct descendant of the Pures and the Slight the Schweiger family concern have optimised the design as far as possible with current (2020) 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, KST X06, Blue Bird BMS-125WV
Spoiler servos (2)	Blue Bird BMS-101DMG, Blue Bird BMS-101HV, CHA DS06, KST X06H, Graupner DES 427, ES08
Receiver	4 or 5 channel receiver to match your transmitter
Battery	2S 400-600mAh LiPo, 3S 400-600mAh LiPo
ESC	Hyperflight 28A BLHELI-32, Hyperflight 30A BLHELI-32, Hyperflight 40A BLHELI-32

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
DYS D2225-19	2S 450mAh LiPo, 9x6, 10x5
DYS D2225-19	3S 450mAh LiPo, 7x3.5, 7x4, 8x4
Dualsky XM2225EG-23	3S 450 mAh LiPo: 7x4, 8x4, 8x5
Dualsky XM2230EG-16	3S 450mAh LiPo, 9x5
Dualsky XM2230EG-9	2S 450 mAh LiPo: 8x4, 8x5, 8x6

** All motors apart from the geared Hacker will need a little force applied between the fuselage sides (to widen them) when installing the motor. If you are not confident please select the Hacker A10-7L option.

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

The above weights are for the electric version. The glider version will be a bit lighter due to its longer fuselage and thus longer nose moment.