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Joy F5J 2.5m

Product Code: JOY-F5J
 (4 reviews)

Price: $874.76

4 in stock
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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 printed manual is available but this photo build guide is excellent. 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 HyperFlight 40A BLHELI-32 ESC, HyperFlight 40A BLHELI-32 ESC with HV SBEC, 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, 9x5, 9x6 prop
Powerline Micro 1010 3S 650mAh LiPo, 12x8 prop
Mega 16/15/4 2S 600mAh LiPo, 9x5 prop
Mega 16/15/5 7x5 folding prop, 3S 600mAh LiPo (8.2 m/s, 1640 fpm, 29A)

Joy Control Throws & Mixes
Rudder 25 mm each way
Elevator 15 mm up / 15 mm down
Ailerons 14 mm up / 14 mm down
Flaps 30mm down, 10mm up
Recommended Flight Mode Camber Settings
Speed 2 mm up at flap root, ailerons in line
Cruise Wing underside flat (0mm)
Thermal 1 3 mm down at flap root, ailerons in line
Thermal 2 8 mm down at flap root, ailerons in line
Landing mode Flaps: 30mm down, Ailerons: 15mm down

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

Reviews 4  

 Review by:

Excellent ĎBabyí F5J

Like a lot of us Iíd love a 4m carbon ship, but the price jumps exponentially at that sort of size, and for most sport flyers (like me) itís hard to justify.

Thatís why this 2.5m Joy appealed to me, and a lovely thing it is too. A lot of the assembly work is done for you, and these things are beautifully manufactured, Iíve got the smiley face design and itís flawless. Everything goes together so well, and the wiring harness is pre-installed and everything marked on the carbon layup for things like servo horns and the cuts for the wing servo rods. The servo boxes are cleanly finished and you really canít mess up the channel to the servo horn unless youíre very ham fisted!

As ever with a precision wing like this one, you need some high precision servos to do it justice and to ensure you get reliable and consistent camber and other wing positions, so donít skimp on those if you can help it.

All up weight for mine was 690g, but I went for a gearbox motor. The two fuse hatches allow for flexible rc positioning and access, but tape them on before flight just in case.

Flight wise, Iím finding it really rewarding, it will float quite readily if thatís your style, but is also happy screaming around making you smile at the sound of it.

Delivery from Neil was as ever brilliant, well boxed and arrived in perfect condition. The box has got a second life at my daughterís primary school as part of a giraffe sculpture, the cardboard is very strong! :-D

 Review by:

A real joy to fly

Great quality, easy to build and super lightweight. Even with a regular layup I ended up on 660g AUW. Super fast delivery as always! Thanks!

 Review by:

Gorgeous In Yellow

Over the past year, I've learnt so much about thermal flying, so I'm already planning for more during 2023. Although I won't be competing, I've come to the conclusion that's it's worth paying the extra for performance. I went for the Joy F5J as a stepping stone towards full size F5J in the future. Beautiful construction and design. And the smiley faces look great in real life! And I love the dazzling yellow, light layup I chose. Not built yet, but aiming for 2023..... Great service from Neil who uses very strong boxes for safe delivery.

 Review by:

Joy F5J

This is an amazing sports model that fits into the trunk of the car, floats really well, is easy to fly and is built with high quality standards using spread tow carbon fibers for the wing and tails. The manufacturer has added a lot of lovely details, like the snap-on canopy and servo hatch. The construction is light and sufficiently strong for the intended purpose. On my model, the carbon fabric of the top skin did not fully reach down to the hingeline (there is a molded in hinge-gap). The manufacturer was responsive and said they did not think this would be an issue. I have added locally E6000 adhesive to bridge that gap and prevent the bottom wing skin from de-laminating near the flap and servo horns. This is a small issue, and can be easily fixed to improve longevity of the airframe. Overall, this is a very fair deal for the aircraft, and the overall quality and joy of having one is high.

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