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Supra Expert Electric F5J 3.4m

Product Code: SUPRA-EXPERT-E
 (3 reviews)

Price: $1,574.33

Out of stock, notify me when back in stock


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

Reviews 3  

 Review by:

Spring an many flying hours on . . .

OK . . . its spring, my flying review. I was not to impressed with the Supras fusalarge arangement cockpit size etc, I made a number of mods including a replacement AVA pod/boom. At the end of the day I have finished up with the original fusalarge modified with a second cockpit cut between the original and the wing mount pylon, not priety but functional.

So how does Supra perform. I love the wing servo arangement, servoes can be replaced in just a few minuets, on the field if necisary! The 6100 servoes are a little delicate and vunerable on landing if you dont get the flaps up in time, I have done two since January!

Despite my inadequacies what about the flying ability of Supra. Frankly it is briliant, as I get used to it and adjusted the trim more to my liking, I prefer the CG a few more mm further forward than that recomended, a personal preferance.

The speed range is remarkably wide. Into wind, she can be held as though she were a bigger span, lighter loaded machine, that extra few mm of CG is helpfull.

Low level thermal sniffing is excelent, get the wing tip up, and keep the speed on, she flies away, doubling your height in no time. I have found no issues with tip stalling or nose droping that cant be anticipated. One is also impressed with Superas thermal indication, fly into a thermal and the nose lifts, even the lightest of thermals are visable, the same for wing tip and side slip indication, streight into a turn and away you go!

Flying gets 5+ stars in my book, just a poor fusalarge arangement . . . in my humble opinion?

The flying is so good, the envelope so wide, my 4m Pulsar and 4m Ava have stayed in the car.

 Review by:

Experience needed . . .

‘Supra has been around a long while, in various modification upgrades, currently I love the way she flies. If there is lift about she will find it and show you where it is. I have found that she will scratch on a gnats **rt at 20ft, producing tight thermal turns without the hint of a stall. I am currently investigating why she will do this and think I have worked it out.

. . . On last approach 30 seconds to go, another model on the same time and in the same air, throw a tight thermal turn with confidence and you have the ‘time’, just make sure you have the spot. As I say after todays session I think I know why Supra can do this . . .

However, when one pays £1000 for a moulded e-glider kit one expects things to be right, the wings are right, the tail is OK, but the bit that holds them together as a flying machine needs a serious revamp on dimension and better use of available space and access in view of modern and recent component availability . . . ? Experience stepped in and ‘I made what I had, work’. As a first moulded composite F5J, one would have been asking questions.

. . . that said, I cant wait for some warm weather so that I can get the trim spot on and really see what I can squeeze out of Supra, despite the difficulties and unsightly surgery that had to be done.’

Flying performance is worth 5 stars, the present fuselage can only rate at 4 stars.

 Review by:

Kit looks very well manufactured. I have the mini graphite, the graphite, super ava etc and this Supra kit is also designed very well.

Unfortunately it arrived damaged and incomplete. The damage was not caused by transport, because for/during transport it was packaged very well. One of the corners of the flaps was broken/damaged and also the tailboom had a tear of 3,5 cm at the beginning.

Some parts for the battery-tray were missing.

HyperFlight Response
We subsequently tried emailing the customer (three times) but have not had a reply. We will be happy to resolve this if given the chance.

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