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El Niño 3.9m

Product Code: EL-NINO
Description

El Niño 3.9m

El Niño F5J is the latest and greatest 4m F5J plane to alight on planet HyperFlight. It is an extraordinary tour-de-force by the designer and manufacturer Alex Hoekstra. Informed by DLG build techniques the structure is exquisitely light, the surface finish is excellent and the aerodynamic detail design is exceptionally good. The F5J design requirements were modelled using XFLR5 and it was found that a model with a very high aspect ratio of 21.5 matched to a low 1000 g weight gave the best combination of small thermal climb performance and a good speed range. To achieve performance at these very low Reynolds Numbers a family of 11 specially optimised ultra thin airfoils were developed. Good handling was assured by incorporating a little washout. This has the added benefit of eliminating tip stalls in the bumpy thermals often found low down.

The phrase flies like big discus launched glider is rather overused and under attained. El Niño really achieves this goal, with the model clearly indicating the tiniest air currents and almost responding to your thoughts, rather than ploughing though the ether and lagging control inputs like a heavier and less nimble model. The excellent performance and lovely handling will allow audaciously low F5J starts to be made with confidence, and will enable a sport flier to outsoar the best.

The El Niño fuselage is a very streamlined, tadpole like shape, with a tiny bulge at the front to accommodate the motor and batteries progressing into a very slim boom. The fuselage front has the motor firewall molded in place. This needs to be reinforced with a 2 mm glass or carbon fibre firewall. The 19 cm glass fibre canopy hatch is securely fastened by carbon pegs to the front and rear. Removing it reveals fairly constricted opening with a maximum width of 28 mm. Fitting the powertrain, battery and RC will require careful planning. The nose is quite short so a slightly heavier powertrain and battery may be required to achieve the required centre of gravity. Simple and strong 3 mm OD carbon tube pushrods are ready fitted, changing to 1 mm wire at the rear, providing a conventional and slop free linkage to the elevator and rudder. The fuselage in front of the wing is made from glass fibre coloured black, so it is 2.4 GHz friendly to help with the RC installation, further back it changes to carbon fibre for maximum stiffness. The wing is mounted on a very slim and low drag pylon, to minimise the interference drag caused by the two bodies meeting. Similarly the tailplane is mounted on a small pylon, which is again nicely faired into the rear fuselage boom. The fin and rudder slide onto a spigot molded at the end of the boom. The fit of these parts is brilliant and perfect alignment is assured. The exceptionally light 17 g fin/rudder assembly only requires the rudder horn to be fitted to complete it.

The tailplane is of Rohacell/Carboweave spread carbon construction with a superb finish despite its 24 g weight.

The wing is of hollow molded construction, rather than using solid foam cores, as the manufacturer believes this is the only way to avoid the surface finish deteriorating due to the underlying foam bubble structure slowly deforming the surface. The front part of the wing incorporates a Dbox to improve the torsional rigidity despite the airfoil's 5.2% thinness.

We currently have two wing layups in stock:

Checkerboard/Carboweave - this stronger layup consists of a Textreme Checkerboard Dbox and a Vladimir veil type spread carbon rear portion. This layup wing weighs approx 24 g more.

All Carboweave SC - this wing layup uses Vladimir veil type spread carbon everywhere.

El Nino comes with all linkage and other items required for completion, apart from the RC and powertrain. A ballast tube is supplied capable of taking up to 280 g of lead, but this much is hardly ever required. Ballast slugs can be easily constructed by the modeller from fishing weights threaded onto a 1 mm wire.

The main things that separates El Niño from the competition is the low weight, the high aspect ratio nearly 4 m wing, the excellent aerodynamic design and the beautiful finish.

Check out these Dutch forum El Nino announcement and El Nino build thread for lots more info.

(c) 2017 Neil Stainton.


El Nino Specifications
Wing span 3.93 m 155 in
Wing area 72.0 dm2 1116 sq in
Length inc spinner 163 cm 64.2 in
Flying weight from 1050 g 37.0 oz
Wing loading 14.6 g/dm 4.8 oz/sq ft
Aspect ratio 21.5
Wing airfoil Proprietary
EDA (dihedral) 6.4º
Spinner Diameter 28 mm
Centre of Gravity 95 - 105 mm from wing leading edge
Controls Rudder, elevator, ailerons, flap, throttle



El Nino Typical Weights
Fuselage inc pushrods 114 g 4.0 oz
Wing centre panel 270 g 9.5 oz
Wing tips 290 g 10.2 oz
Tailplane 24 g 0.8 oz
Fin 17 g 0.6 oz
Accessories 65 g 2.3 oz
Total structure 780 g 27.5 oz
Wiring 10 g 0.4 oz
Receiver 7 g 0.2 oz
Rudder servo 9 g 0.3 oz
Elevator servo 9 g 0.3 oz
Wing servos (4) 38 g 1.3 oz
Speed control 30 g 1.1 oz
Motor 77 g 2.7 oz
Prop & spinner 20 g 0.7 oz
Battery 70 g 2.5 oz
Flying weight 1050 g 37.0 oz



El Niño Recommended Servos
Elevator & rudder KST X08, Blue Bird BMS-A10H, MKS DS6100, MKS DS75K, MKS HV75K, MKS HV6100, Blue Bird BMS-106HV
Aileron KST X08H, Blue Bird BMS-A10V, MKS DS75K, MKS HV75K, Graupner DES428MG
Flap MKS DS6100, MKS HV6100, MKS HV6110, Blue Bird BMS-105HV



El Nino F5J Powertrain Recommendations
Powerline Micro 1010 3S 500mAh LiPo, 12x8 prop
Powerline Micro 1015 3S 500mAh LiPo, 15x8 prop
Leomotion L3007-5000R 3S 900mAh LiPo, 13x6 prop
Tenschock Viper 4450 5:1 3S 800mAh LiPo, 14x7 GM prop, 40A ESC



Note this is preliminary information and may be subject to change.

El Niño 3.9m

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Price: $1,750.67
3 in stock

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