Joy F5J 2.5m

The Joy F5J is an all new 2.5m (98″) span F5J electric glider from HQ Composites in Ukraine. With an excellent surface finish and a modern practical design this is sure to be a very successful model. The well proven AG series airfoils, combined with the high aspect ratio polyhedral wing and the low drag finish give this model a great all round performance, with easy thermalling and great legs for returning upwind after specing the glider out.

Special features of this model include:

• A well designed low drag fuselage with an under-wing access hatch for easy RC installation and maintenance.
• A large canopy hatch that springs into place, VM style. This gives easy access to the powertrain and allows quick battery changes.
• A high aspect ratio polyhedral wing with Drela airfoils optimised for F5J flying – the wing is especially stable in thermal turns, allowing the model to be climbed away from small, weak thermals with minimal control input.
• The wing maintains a good L/D up to higher speeds, allowing the Joy F5J to easily return from far downwind.
• Excellent quality of construction with useful accessories supplied to allow a quick RC installation.
• The two part wing and the tailplane are easily removable, allowing the model to be easily transported.

The fuselage is an all carbon one piece design with nose and underwing access hatches and a ready installed pylon for mounting the spead carbon tailplane. The SC fin and rudder is removable and is held in place with tape.

The wing is an all molded spread carbon over blue foam structure with a great surface finish, and very good strength, considering its low weight. It is noteworthy that the wiring for the flap and aileron servos is built in, with the sockets already built into the wing roots, and skeleton conductors for inserting into the servo plugs – no soldering required – just tape over the plugs after inserting the conductors.

The accessory bag contains fuselage servo mount, carbon servo covers, wire and tubes for flap and aileron pushrods, pull cable and torque springs for the tail surfaces, all control horns and the fuselage end of the wiring harness. Also included is a firewall for recessed installation 30mm behind the front of the fuselage. This is suitable for mounting a 28mm dia outrunner, but will not work with any of the motors we stock. These will require a 32mm front firewall.

No manual is currently available. Any modeller interested in making an RCGroups build log please contact us!

Joy F5J Specifications
Wing span	2.5 m	98 in
Wing area	39.6 dm2	614 sq in
Length inc spinner	126 cm	49.4 in
Flying weight from	675 g	23.8 oz
Wing loading	17.0 g/dm	5.6 oz/sq ft
Aspect ratio	15.7
Wing airfoil	AG series mod
EDA (dihedral)	5.5º
Spinner Diameter	32 mm
Centre of Gravity	72-78 mm from wing leading edge
Controls	Rudder, elevator, ailerons, flap, throttle

Recommended RC
Rudder & Elevator	KST X08, KST A08, Blue Bird BMS-A10H
Ailerons	KST X08H, KST A08H, Blue Bird BMS-A10V
Flaps	KST X08H, KST A08H, Blue Bird BMS-A10V
Receiver	7+ channel rx to match your transmitter
Speed Control	Quanum BLHeli32 30A ESC, HyperFlight 30A BLHELI-32, 30A ESC with 3A uBEC
Flight battery – max size 25x25x1000mm	2S 800mAh-1.2Ah LiPo, 3S 500mAh-850mAh LiPo

Joy F5J Powertrain Recommendations
Roxy C28-30-09	Or other 28mm 55g-65g outrunner with a Kv of 1100-1600 RPM/V
XPower F2915/12 XLight	3S 750mAh LiPo, 9×5, 9×6 prop
Powerline Micro 1010	3S 650mAh LiPo, 12×8 prop
Mega 16/15/4	2S 600mAh LiPo, 9×5 prop
Mega 16/15/5	7×5 folding prop, 3S 600mAh LiPo (8.2 m/s, 1640 fpm, 29A)

Joy F5J Typical Weights
Fuselage	83 g	2.9 oz
Wings (light)	280 g	9.9 oz
Tailplane	22 g	0.8 oz
Fin	21 g	0.7 oz
Joiner	7 g	0.2 oz
Accessories	20 g	0.7 oz
Total structure	433 g	15.3 oz
Pushrods	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)	36 g	1.3 oz
Speed control	10 g	0.4 oz
Motor	72 g	2.5 oz
Prop & spinner	18 g	0.6 oz
Battery	76 g	2.7 oz
Flying weight	680 g	24.0 oz