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MAX Flight F5K 1.5m

Product Code: MAXFLIGHTF5K
 (2 reviews)

Price: $563.49

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The MaxFlight F5K is an innovative 1.5m electric DLG type glider with two piece wings. With great performance and forgiving flight characteristics this may be the most advanced F5K model we have seen so far.

The outstanding benefits of this model are:
  • Well thought out design intended for electric flight from the outset - not a modified discus launch glider.
  • Excellent glide performance and good speed range.
  • Lightweight carbon all molded construction.
  • Superb surface finish and attractive colour schemes.
  • Two piece wing and easy to dismount the fin and tailplane make for a very easy to transport model in a box just 86 cm (34") long.
  • Large canopy hatch for east access to the motor, ESC and battery.
  • Available in 4 servo (flaperon) and 6 servo (aileron and separate flap) versions.
  • Preinstalled mounting system for 4 KST X08 tail and wing servos under the wing.
  • Large under-wing hatch for access to the fuselage servos.
  • Easy and quick assembly at the field.
The wing is beautifully molded from spread carbon with a Rohacell core to maximise strength and dimensional stability, ensuring the surface finish stays smooth. The wing is available in two versions:

Flaperons - a single control surface on each wing, actuated from fuselage mounted servos, is used both for roll (aileron) and flap/camber, as used successfully on DLGs. This has the advantage of simplicity and not needing any wing mounted servos, reducing the cost. Also only a 5+ channel receiver is required and transmitter programming is simplified.

Separate Ailerons and Flaps - two control surfaces on each wing. The inner flap control surface is actuated from fuselage mounted servos, and the outer aileron control surface is mounted by an outboard servo. This has the advantage allowing much greater flap deflection during landing, giving better control and slower touchdowns - potentially allowing the model to be flown from a smaller field. A 7+ channel receiver will be required and transmitter programming is a little more complex.

The fuselage is a one piece design with a generous front to facilitate fitting a small powertrain and four servos. A firewall is supplied but not fitted, to allow it to be recessed as appropriate for the motor used. The tailplane (horizontal stabiliser) and fin (vertical stab) are very light and have a good finish. The rudder and elevator are ready hinged and give good control response.

The fuselage is supplied with a servo deck pre-cut for 4 pcs KST X08 servos. The supplied accessories include a firewall, servo mount, all pushrods, rudder and elevator pull cables, torque springs, and all control horns. The wings are supplied in thin foam bags but fit nicely in our DLG F3K Wing Bags for greater protection.

MaxFlight F5K Specifications
Wing span 1.5 m 59 in
Wing area 18.8 dm2 291 sq in
Length inc spinner 87 cm 34.3 in
Flying weight from 270 g 9.5 oz
Wing loading 14.4 g/dm 4.7 oz/sq ft
Aspect ratio 12.0
Wing airfoil Special 7%
EDA (dihedral) 6.0º
Spinner Diameter 25 mm
Centre of Gravity 61-65 mm from wing leading edge
Controls (4 servo version) Rudder, elevator, ailerons, throttle
Controls (6 servo version) Rudder, elevator, ailerons, flaps, throttle

Recommended R/C
Elevator & rudder servos KST X08H, Blue Bird BMS-A10V
Flap/Flaperon servos KST X08H, Blue Bird BMS-A10V
Aileron servos (6 servo version) KST X06H, Ripmax SD100
Receiver (4 servo version) 5 channel rx to suit your transmitter, eg Spectrum AR6610T, Orange DSM2 compatible, Jeti Duplex R5, Multiplex Mlink RX-6 Light & RX-5 Light
Battery (2S 300 - 450 mAh LiPo) Nanotech 2S 300 mAh, Radient 2S 430 mAh

Electric Powertrain Recommendations
ADH300S / MM1906-2400 Rear Mount 2S 450mAh LiPo, 6x4 folding prop
LDARC XT1806 2S 450mAh LiPo, 6x3, 6x4 folding prop
F5K/Snipe 2e Powerset 2S 450mAh LiPo, supplied 6x3 folding prop
F5K/Snipe 2e Pro Powerset 2S 450mAh LiPo, supplied 6x4 folding prop
XPower F2307/14 2S 450mAh LiPo, 6x4 folding prop

Electronic Speed Controls (ESC) Recommendations
Hyperflight 11A BLHELI-32 11A, no BEC, use HV/WV servos
Quanum BLHeli32 20A 20A, 3A BEC, good
Sunrise 20A Pro 20A, 3A BEC, a bit too big
HyperFlight 30A BLHELI-32 30A, 2A BEC, plug ready fitted

The powertrain used in the photos gave closely folding prop blades to minimise drag. The items used were as below, however a VM Powerset will also work well.
VM 25mm Spinner for M5 shafts
CN 6x4 folding prop blades
HyperFlight 30A BLHELI-32

MaxFlight F5J 6 Servo Control Throws
Rudder 12 mm each way
Elevator 8 mm up / 6 mm down
Ailerons 8 mm up / 5 mm down
Flaps (roll) Flaps follow ailerons
Flaps (landing) 40 mm down (6 mm down elevator with full flap)
Camber Settings
Speed Flaps 2 mm up, ailerons follow flaps
Cruise 0 mm
Thermal Flaps 4 mm down, ailerons follow flaps

MaxFlight F5J 4 Servo Control Throws
Rudder 12 mm each way
Elevator 8 mm up / 6 mm down
Ailerons 11 mm up / 7 mm down (at wing root)
Ailerons (landing) 25 mm down (4 mm down elevator with full flap)
Camber Settings
Speed Ailerons 2 mm up
Cruise 0 mm
Thermal Ailerons 4 mm down

MaxFlight F5K Typical Weights - 4 servo version
Fuselage 36 g 1.3 oz
Wings 97 g 3.4 oz
Tailplane 10 g 0.4 oz
Fin 7 g 0.2 oz
Wing joiner 10 g 0.4 oz
Accessories & glue 10 g 0.4 oz
Total structure 170 g 6.0 oz
Receiver 6 g 0.2 oz
Rudder servo 8 g 0.3 oz
Elevator servo 8 g 0.3 oz
Wing servos (2) 17 g 0.6 oz
ESC 5 g 0.2 oz
Motor 20 g 0.7 oz
Prop & spinner 6 g 0.2 oz
Battery 30 g 1.1 oz
Flying weight 270 g 9.5 oz

(C) 2021 Neil Stainton

Reviews 2  

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Build Notes

When I unboxed the Max Flight, the effort that had gone into designing and manufacturing it was very evident. It exudes quality. I chose this model as unlike most other manufacturers, it was designed with excellent regard to installing and accessing the servos. Given how light the airframe is, the general construction of the model is a lot more robust that I expected.

After planning the build, my first task was to do a small bit of fettling to the servo holes, which are pre prepared for KstX08. I just needed to ensure that wires would not be pinched and to create a bit more room for the control horns. Tool needed, decent diamond coated files. The servos fit into the frames using very small screws, fortunately I had a suitable 0.7mm drill bit.

I decided to use 0.7mm bowden wire to connect to the rudder and elevator as I want to be able to remove them for holiday transportation and this would be more durable and easier to handle than the supplied cord. This meant using different control horns. Rudder was the same pcb type but as I am a bit paranoid about elevator controls, I decided to fit a small brass MP Jet fitting, tiny but very robust and hidden by the rudder. The only difficulty I found with the R/E build was that it was very difficult to thread a wire or cord through both the front and rear "eyelets" for the rudder. Solved by removing the one in the servo bay.

I particularly wanted a 2 piece wing for transportation. I think that there are also storage and "hanger rash" benefits. Wing servo horns were easily installed by slitting the aileron skin in the premarked position, working some glue in and sliding the horns into place. Before fitting the horns, you need to suitably open out the holes for the control wires. The only problem I had was that after mounting the servos in their bays, I found that the supplied connection rods were each about 5mm too short. Not a problem as I just made a couple more but I could have avoided having to had I ignored the fitting template, fitted the servo and control rod and used that to check the positioning of the aileron control horns before fitting them. Guess I forgot the maxim "measure twice, cut once".

All in all, an easy build with the absence of instructions not proving to be a problem. Although the information is on the Hyperflight website, it wouldn't hurt for the model to come with a sheet detailing the recommended cog and control throws.

I would also suggest that people fit the cnc motor mount from Hyperflight as this significantly strengthens the nose as well as being easy to fit.

Overall weight excluding 2s lipo is 270g, so around 300g rtf.

 Review by:

Max flight f5k

Needless to say the quality of model is outstanding. Build of went well, a little fidly to get flap pushrods running smoothly , a little bending is advised . used the kst xo6 v6 servos plus plastic frames for the ailerons, cn 6x4 prop with Ldarc xt 1806 motor esc tallon 15a on 3s 300mah and altis nano, Auw 314g. Im familiar with f5k, got the fury and nrj, very happy with nrj, and the mf5k also has a narrow cord wing, will penetrate well in windy conditions and fly well in fair weather, still got to maiden. The plane is worth every penny. The 4 servo is ideal for f5k comp. with auw 270g rtf. The 6 servo just makes your landings easyer . Usual exellent Hyperflight sales and shipping. Thanks Neil

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