Home Customer Info My Account Forum Contact Us Special Offers

Ultima F5J 4m

Product Code: ULTIMA

Ultima F5J 4m

The new Ultima F5J is an epoch defining model. It takes my breath away - I couldn't sleep the first night after seeing it. The Ultima is bigger, lighter, and better designed than any other F5J electric glider ever mass produced. The finish is superb. It is practical. It looks great. It is amazing value when considering the quality of design and construction. I want to keep them all for my personal collection!

The Ultima is produced by a leading manufacturer of hand launched gliders, and DLG technology and thought processes inform the design. Modern discus launched gliders are the ultimate tool for working low level thermals, and the Ultima has taken the technology and scaled it up to work for a 4 meter F5J model, that has to be brought back from a mile downwind as well as get away from a 30 m launch.

The whole model is engineered to be as light as possible while being just strong enough for flight loads and careful handling forces. The 175 cm long one piece carbon fuselage weighs just 126 g - and this is the standard version, a light one is available to order. It has a large canopy hatch to provide good access to the flight battery and allow for easy powertrain and RC installation. The rudder and elevator servos are mounted in the pod for low inertia and the control surfaces are operated by lightweight pull-pull cords. The wires are already installed and connected to well engineered bell cranks which actuate pushrods which operate the tail surfaces without slop. The rudder and elevator actuation is excellently thought out and completely finished, with no work to be done other than connecting the servos.

The all spread carbon 35 g tailplane is mounted on a short pylon at the rear of the fuselage, as is fashionable currently. Two pins locate it in the pylon and it is retained by a single screw. The elevator is a generous 40% of the chord, and like every other control surface is living hinged on one side, and has a gap seal installed on the other side. The dismountable fin and rudder assembly weighs just 21 g and slots into fittings molded into the rear fuselage. It is retained by a single bolt. Both the elevator and rudder horns are installed by the manufacturer, and no work is required by the modeller.

Like the other flying surfaces the wing is solid molded using a very light biaxial spread carbon over a Rohacell core. The surface finish is excellent and a strong carbon spar provides adequate strength. The centre panel incorporates 1.7º of dihedral and is 160 cm long, providing for larger than usual flaps, which can be deflected 80º or even 90º down, to enable very slow and easily controlled maximum point landings. Pockets sized 34 mm x 34 mm x 16 mm are ready cut for the flap servos. Servo wires are installed, but plugs and sockets will have to be soldered by the customer while in place. DB9 plugs and sockets are provided for the wing-fuselage connection.

The Ultima's tip panels are very light, to minimise inertia, so it indicates lift very well, and little energy is required for manoeuvres. The large ailerons provide good roll control and they extend to the tip, allowing the camber to be set to a constant value for the whole wing, to minimise drag in all flight modes. The aileron servo pockets are 34 mm x 34 mm x 11 mm deep.

Two sets of wing joiners are provided for the tip panels - 5º and 7º. I recommend the 7º joiners are used most of the time for easy low level thermalling and the 5º joiners are reserved for windier days to reduce the effect of turbulence.

The wing and tail fits in one of our 182 cm glider bags. We highly recommend one is purchased with the model to reduce the possibility of shipping damage or hanger rash. A set of custom Ultima wing and tail bags is also available. Although these don't give so much protection in transport they can be fitted while the model is on the ground in the field, to shade the bare carbon structure and eliminate possible heat damage.

See this Slovenian thread and this RCGroups Ultima thread for more info. Also this Dutch build log is good - use Google Translate.

Text (c) 2016 Neil Stainton
Photos (c) 2016 Jure Korber

Ultima F5J Specifications
Wing span 4.0 m 157 in
Wing area 79.8 dm2 1236 sq in
Length inc spinner 186 cm 73.2 in
Flying weight from 1120 g 39.5 oz
Wing loading 14.0 g/dm 4.6 oz/sq ft
Aspect ratio 19.9
Wing airfoil Proprietary
EDA (dihedral) 7.5º with 7.5º joiner
Spinner Diameter 30 or 32 mm
Centre of Gravity 105 - 115 mm from wing leading edge
Controls Rudder, elevator, ailerons, flap, throttle

Ultima F5J Typical Weights
Fuselage 126 g 4.4 oz
Wing centre panel 362 g 12.8 oz
Wing tips 280 g 9.9 oz
Tailplane 35 g 1.2 oz
Fin 25 g 0.9 oz
Accessories 39 g 1.4 oz
Total structure 867 g 30.6 oz
Wiring 10 g 0.4 oz
Receiver 8 g 0.3 oz
Rudder servo 10 g 0.4 oz
Elevator servo 10 g 0.4 oz
Wing servos (4) 40 g 1.4 oz
Speed control 35 g 1.2 oz
Motor 70 g 2.5 oz
Prop & spinner 20 g 0.7 oz
Battery 50 g 1.8 oz
Flying weight 1120 g 39.5 oz

Ultima F5J Recommended Servos
Elevator & rudder MKS DS6100, MKS HV6100, Blue Bird BMS-105HV
Aileron MKS DS6100, MKS HV6100, MKS HV6110, Blue Bird BMS-105HV, KST X08
Flap MKS DS6100, MKS HV6100, MKS HV6110, Blue Bird BMS-105HV

Ultima F5J Control Movements
Rudder 35 mm each way
Elevator 15 mm up, as much down as you can get
Ailerons 20-25 mm up, 15 mm down
Flap 85 degrees down or as much as possible
Recommended camber settings
Speed mode 0° (flap in line with wing centre molding)
Cruise mode 3° down
Thermal mode 8° down
Recommended landing settings
Flap max down
Ailerons 8° up
Elevator compensation 2.5 mm down

Ultima F5J Powertrain Recommendations
Powerline Micro 1010 3S 500mAh LiPo, 12x8 prop
Powerline Micro 1015 3S 500mAh LiPo, 15x8 prop
Powerline Micro 1025/F5J 3S 900mAh LiPo, 16x8 RF or GM prop (2000 fpm, 43A)
Leomotion L3007-5000 3S 900mAh LiPo, 14x8 prop (1750 fpm, 39A)

A firewall is not installed in the fuselage or supplied, so we recommend one of the third party firewalls we stock is purchased. Also the fuselage nose is longer than required for balance (even for a 78 g motor), so it can be shorted by approx 30mm which also makes it suitable for 32mm spinners.

Note this is preliminary information and may be subject to change. In particular due to the large box size extra shipping charges may need to be added for some destinations.

More details

Ultima F5J 4m

 (4 reviews)
Price: $1,993.07
6 in stock

View other products in