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Supra Expert Electric F5J 3.4m

Product Code: SUPRA-EXPERT-E

Supra Expert Electric F5J 3.4m

The Vladimir's Models Supra Expert Electric is the latest version of the electric Supra F5J. Despite its strong spar the spread carbon version can be built down to 1.35Kg, making it a great F5J thermal soarer. Its light weight has been made possible by a very light spread carbon fabric perfected by Vladimir Gavrilko, or by a tough but light Glass layup on the Glass Ultralight version. The wing is a monocoque structure with a skin of a double layer of spread carbon/glass strengthened with a strong spar made with a multi-ply 45º balsa and carbon shear web between substantial IMS 65 carbon spar caps. The fin and rudder are all molded in the latest versions.

The benefits of this version are:

IDS servo mount and LDS connecting rod

  • New pylon mounted tailplane reduces drag and improves pitch control.
  • Fuselage pod designed for geared electric motors with a removable canopy hatch for easy access to a lightweight powertrain.
  • Ultralight molded fin and rudder for increased strength and resistance to transport damage.
  • New Ultralight molded tailplane (horizontal stabiliser). This is lighter and slightly larger, improving stability and reducing inertia.
  • Supplied with a lightweight wiring loom for the fuselage and wing connections.

These improvements make it the best sub 3.5m plane for the UK's eSoaring and the FAI F5J class. This version will also be attractive to all pilots who prefer a lower weight model that excels in typical weak lift conditions, yet has the speed range to cope with 25 mph winds with ease.

Supra Glass molded wing construction

Our thanks to Rok and Jure Korber for use of their excellent photos. Note some of the images show previous Supra versions, with a V mounted tailplane.

Supra Expert Electric Specifications
Wing span 3.4 m 134 in
Wing area 66.7 dm2 1034 sq in
Length 170 cm 66.9 in
Flying weight from 1615 g 57.0 oz
Wing loading 24.2 g/dm2 7.9 oz/sq ft
Aspect ratio 17.3
Wing airfoil AG 40/ AG 41/ AG 42/ AG 43
Dihedral (EDA) 6.0º
Spinner Diameter 38mm or 32 mm (Pro pod)
Centre of Gravity 95-112 mm from wing leading edge
Controls Rudder, elevator, ailerons, flaps

Supra Expert Electric Glass Layup Typical Weights
Pod 145 g 5.1 oz
Boom 55 g 1.9 oz
Wing c/s 523 g 18.4 oz
Wing tips 365 g 12.9 oz
Tailplane 26 g 0.9 oz
Fin 34 g 1.2 oz
Accessories & wiring 97 g 3.4 oz
Total structure 1245 g 43.9 oz
Receiver 12 g 0.4 oz
Tail servos 13 g 0.5 oz
Wing servos 60 g 2.1 oz
Speed control 35 g 1.2 oz
Motor 110 g 3.9 oz
Prop & spinner 30 g 1.1 oz
Battery 110 g 3.9 oz
Flying weight 1615 g 57.0 oz

The Supra Expert Light SC Layup is approx 200 g lighter, and has been built down to approx 1350 g using a 75 g motor and very small batteries.

Recommended Servos
Elevator & rudder MKS DS6100, KST X08, Corona DS843MG, Hyperion DS09-AMD
Aileron Corona DS843MG, Hyperion DS09-AMD, MKS DS6100, KST X08
Flap MKS DS6125 Mini, MKS DS6125, MKS HBL6625, MKS DS6100, KST DS135MG

Supra-e Powertrain Recommendations
Powerline Micro 1015/F5J 3S 1.0Ah LiPo, 16x8 RF or GM prop (1750 fpm, 38A)
Powerline Micro 1025/F5J 3S 1.3Ah LiPo, 16x8 RF or GM prop (1950 fpm, 43A)
Leomotion L3007-5000 3S 1.3Ah LiPo, 14x8 prop (1700 fpm, 39A)
Hacker A20-6XL geared 4.4:1 3S 1.3Ah LiPo, 16x9 Aeronaut prop (1900 fpm, 46A)
Mega 16/15/4 direct drive 3S 1.0Ah LiPo, 8x4 prop (1200 fpm, 50A) - reputed to work, seems risky!
Mega 16/25/4E direct drive 3S 1.3Ah LiPo, 12x6 prop ( 1800 fpm, 59A)
Mega 16/5/3 Maxon 4.4:1 gearbox, 3S 1.0Ah LiPo, 14x9 prop

In order to avoid tail ballast the motor must weigh no more than 100g and the ESC and battery weight must be kept to a minimum.

Supra Nomenclature - these are the various terms used to describe the different versions
Classic The original fatter pod, with a removable nose cone.
Pro The new longer, slimmer drooped pod - used on all glider Supras. Now suplied on most electric models. Only very small (Speed 400 size/25mm diameter) geared motors can be fitted.
Competition The model is fitted with a built-up tailplane (horizontal stabiliser) and rudder. This results in a slight reduction in tail weight, reducing the model's total weight and inertia.
Expert The model is fitted with lightweight spread carbon molded tailplane (horizontal stabiliser) on a short tail pylon. This reduces drag and improves the model's stability and pitch response.
Ulralite The wing has a reduced strength spar and glass wing skins - lightest, but suitable for low energy electric flight only.
Spread Carbon The SC (also called ST for Spread Tow) wing has a full strength F3J spar and spread carbon wing skins - very light and very strong.
Glass The wing has a full strength F3J spar and all glass wing skins - light.
Carbon/Glass The wing has a full strength F3J spar and carbon skins on the centre panel, and glass wing skins on the tip panel - medium weight.
Carbon The wing has a full strength F3J spar and all carbon wing skins - heavier, but very strong.

Supra E-Competition by rok_korber

Supra Expert Electric F5J 3.4m

 (3 reviews)
Price: $1,549.92
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