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Kappa 40 F5J

Product Code: KAPPA40
 (3 reviews)

Price: $1,287.69 save 20%

1 in stock

Available Options

* Wing layup, colour (serial #):


The Kappa 40 is probably the best value 4m F5J plane available. A stretched version of the Kappa 35 it is very light, a well proven design and it is built to a very high standard. The Kappa 40's advanced structural design ensures it is strong enough for its intended mission, and its finish, completeness and attention to detail is outstanding. The model really is almost ready to fly, with all the wing control horns and pushrods ready fitted, so the only work required to finish the wings is to fit the servos. The rudder horn is also fitted, and all the tail pushrod and servo mounting hardware is supplied.

Special features of this model include:

  • A well designed low drag fuselage with a large canopy hatch giving good access to the powertrain and RC, making for easy RC installation and maintenance. The nose of this new version has been extended to allow lighter batteries to be used than with the older fuselage.
  • A very high aspect ratio wing with proprietary airfoils optimised for F5J flying - the wing excels in low speed tight thermal turns, allowing the model to be thermalled away from small, weak thermals with ease. This allows competition winning low starts to be made with confidence.
  • Despite its extremely good thermal performance the wings maintain a good L/D up to higher speeds, allowing the Kappa 40 to return from a long way downwind with ease.
  • The wing has slightly swept back wing tips, making it approximate to the Schulman planform. This is meant to improve performance and handling, especially near the stall.
  • Superb quality of construction and attention to detail. The airframe design and molding must have entailed literally hundreds of hours work by master builders and designers. This is fully reflected in the final quality of finish, which is truly excellent.
  • The plane was designed and optimised for electric gliding from the start, it is not a modified F3J design. This has allowed a high aspect ratio to be used and more suitable airfoils.
  • All the control surfaces are sealed and the wing control horns are all hidden inside the control surfaces, further reducing drag.
  • The level of completeness of the airframe is exceptional, allowing the model to be finished in just a few hours.
  • The wing breaks down into three pieces and the tailplane and fin are easily removable, allowing the model to be easily transported to contests.

The model is available in three composite layups:

Light - Mostly glass covered flying surfaces, with carbon local reinforcement and a strong carbon spar. This is the lightest version.

DBox - The flying surfaces have a carbon DBox at the front. The rest is mostly glass with carbon local reinforcement and a strong carbon spar. This version weighs approx 50 g more than the Light version but is stronger. This layup costs approx 8% more.

Spread Carbon - All the flying surfaces are covered in lightweight spread carbon, with extra carbon local reinforcement and a strong carbon spar, resulting in the lightest and strongest model possible.This version weighs approx 30 g more than the Light version but is much stronger, more rigid and less susceptible to hanger rash and handling damage, and can be flown faster. This layup costs approx 19% more.

For all wing layups the fuselage is all carbon. The top of the fuselage is painted and the underside is left in natural carbon black. This looks very attractive. For all electric models (irrespective of the fuselage construction) we recommend the 2.4GHz aerials are exited from the fuselage, so they are in the outside airflow. One horizontal and one vertical aerial usually works well. There is too much electrical equipment in an electric glider fuselage for the RC signal to be reliably received inside the pod.

All models are supplied with high quality sewn cloth padded wing bags, to ensure the wing stays in perfect condition.

Kappa 40 Specifications
Wing span 3.9 m 155 in
Wing area 68.7 dm2 1065 sq in
Length inc spinner 161 cm 63.4 in
Flying weight from 1315 g 46.4 oz
Wing loading 19.1 g/dm 6.3 oz/sq ft
Aspect ratio 22.5
Wing airfoil Proprietary
EDA (dihedral) 5.0º
Spinner Diameter 38 mm
Centre of Gravity 85-90 mm from wing leading edge
Controls Rudder, elevator, ailerons, flap, throttle

Kappa 40 Light Layup Typical Weights
Fuselage & pushrods 160 g 5.6 oz
Wing centre panel (Light) 336 g 11.9 oz
Wing tips (Light) 374 g 13.2 oz
Tail plane 44 g 1.6 oz
Fin 31 g 1.1 oz
Accessories & glue 12 g 0.4 oz
Total structure 957 g 33.8 oz
Wiring 30 g 1.1 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 120 g 4.2 oz
Prop & spinner 25 g 0.9 oz
Battery 80 g 2.8 oz
Flying weight 1315 g 46.4 oz

Recommended Servos
Elevator & rudder MKS DS6100, MKS HV6100, KST X08, Blue Bird BMS-A10H, Blue Bird BMS-106HV, Blue Bird BMS-107HV
Aileron MKS DS6100, MKS HV6100, MKS HV6110, KST X08, Blue Bird BMS-A10V, Blue Bird BMS-105HV, Blue Bird BMS-106HV
Flap MKS DS6100, MKS HV6100, MKS HV6110, MKS HBL6625 Mini, KST DS135MG, KST X10 Mini, Blue Bird BMS-105HV

The kit comes with CNC cut plywood fuselage servo mounts designed for the MKS DS6100 and HV6100 servos, so it is easiest if these (or the Blue Bird BMS-105, BMS-106, or BMS-107 compatibles) are used for the tail surfaces.

Kappa 40 Control Movements
Rudder 20 mm each way
Flap 85 degrees down
Ailerons 15 mm up, 12 mm down
Elevator 10 mm up, 10 mm down
Recommended camber settings (measured at flap root TE)
Speed mode -1.5° (flat bottom surface)
Cruise mode 0° (flat top surface at hinge)
Thermal mode +2° (2 mm down)

Kappa 40 Powertrain Recommendations
Powerline Micro 1025/F5J 3S 1.3Ah LiPo, 16x8 RF or GM prop (2000 fpm, 43A)
Leomotion L3007-5000 3S 1.3Ah LiPo, 14x8 prop (1750 fpm, 39A)
Leomotion L3013-4550 3S 1.3Ah LiPo, 15x9 prop (2250 fpm, 57A)
Hacker A20-6XL geared 4.4:1 3S 1.3Ah LiPo, 16x9 Aeronaut prop (1950 fpm, 46A)
Mega 16/25/4E direct drive 3S 1.3Ah LiPo, 12x6 prop ( 1800 fpm, 59A)
Mega 16/5/3 Maxon 4.4:1 gearbox, 3S 1.0Ah LiPo, 12x6 prop

Note that although the spinner diameter is 38 mm the width of the canopy hatch is only approx 27 mm, so the max diameter powertrain that can be fitted is 28 mm (with a little flexing of the fuselage skin). Also the RC and flight battery will have to be installed as far forward as possible to achieve a minimum flying weight. Unlike other (converted F3J) models the nose is only just long enough to achieve the correct balance when using a lightweight motor.

Reviews 3  

 Review by:

I bought a Kappa 35 nearly 5 years ago, since then I have had a Stork, a used converted Maxa as well as several big home made F5J models. While the K35 was initially competitive, wear and tear over time plus bigger models made it no longer my prefered #1 contest model, even though I still really enjoyed flying it and enjoyed the way it flew. Looking at the way all the newer 4m light weights fly, how they perform at events plus the way the cost of these big models keeps going up, I was almost ready to buy another K35 to enjoy the flying style without trying to be very competitive.
Then Neil discounted the Kappa 4.0 and I could not resist it. UK to Sydney took TNT 10 days via Belgium, Dubai, Germany (tracking can be frustrating), but arrived in perfect order as usual. I had prepared the servos, wiring, model memory and power train (Tenshock/reisenhauer) based on the K35 and what I had, so assembly took me one day, mostly threading wires, and gluing in servo trays. Weight is just under 1400g using 3s550, about the same as my K35, even though the factory weight markings on each component of the K40 were smaller than the K35 markings.
I have now flown the model on 3 different days. Lots of fine adjustments to mixing and servo settings but it all came together quite quickly. By day 3 I was happy it was flying just like the K35 but just staying up longer. It can fly a little slower but like the K35 prefers to move around a little faster than the wide chord models.I think this is what I like about the Kappas.
On my 3rd day two of us made maybe 20 practice F5J flights in 16deg max temps with a 5kt wind at a field I normally have trouble finding lift. I made 10 minutes most flights, when I did not, I launched low and misjudged the air. My flying buddy beat me only once or twice flying his Infinity on the day because his Sence was out of service.
Unfortunatley Sydney weather turned bad and the scheduled first F5J event for the model was cancelled last sunday. Next event will not be till August.
I think it might be competitive but at least it will be fun to fly. The Kappas are exquisitly built, they are the cleanest model I have seen, there are no horns or pushrods visible on wing or tail, all inside. All joints fit perfectly. And the bits are even interchangable between the K40 and K35. I am happy.

 Review by:

Kappa 40, (D box), 'the Big K'

Been having a hard time this year in deciding where to go E-glider wise . . . thin wing sections, super light, radical design. All have 'buy me' stamped all over them, a lot of thought, watching and discusion finaly bought me to Kappa. I had a 35 for a few months about 3 years back, inexperiance bought that association to an early, abrupt and dramatic end.

However, I have never forgoten what an impresion the Kappa 35 made on me and my flying friends. Reasoning, 'better a devil you know . . . ' the big 'K' ticking all my boxes, in due course a large box was delivered.

Unpacked, inspected, all OK as has always been with goods ordered from Hyperfligth. A couple of weeks pawing over Kappa 40 got me fully familier with the way I was going to assemble it. Tail, wings etc., all went together nicely, the Blue Bird 105 wing servos were mounted in cradles with an extra head bearing. Needed a little bit of redesign of the servo bays removing the ply push rod keepers which were re instaled in the servo cradle.

Rudder and elevator servos were instaled in a conventional upright tray at the back of the cockpit, a tray is suplied but I prefered the old fashioned way.

Now we come to the nose and motor instalation. Originaly, I was to fit a Glider Drive 960, a tad heavy although a dry run earlier in the assembly had indicated it would ballance out OK. It was the 38mm can diamiter that put me off. So I chose a SK3 28-36. I used a motor mouting system that is a one off to me, keeping the ESC fixed in the top of the fusalarge, wires away from the out drive motor can. The 1800mah 3s battery sliding in under neath up to the motor with a gap keeper, no crumpled wires in a heap.

The 28-36 motor produces a little over 300 watts from an 11x6 carbon toothpick style blade. The building was streight forward enough provided a little experiance is used?
(as an aside, I have also produced a power train using the Glider Drive. Not flown it yet but worked out a way to get a quart into a pint pot, thats 38mm through a 27mm opening)!

So we come to the 'nity grity', how does 'the Big K' perform . . . . .
It has had about one dozen flights so far, flew from the maiden launch with no problems, it flies. I have needed that dozen flights to get things the way I like them, but the throughbread that she is came through exhibiting good charicturistics that could be built on in the trimming process.

Today I deliberatly went for a session with a forcast 14mph wind . . . How did she handle herself, thats just the point, she flew as though it was her normal weather. The 14mph wind was much more like 20mph we estimated at 200m, making no bones about the buffeting she was getting, a friend comented on how similar she flew compared to a DLG,. Take the rough with the smooth, but do nothing that would alarm the pilot. Penetration was easily controled with camber mix and speed mode, along with a little encouragement from the pilot.

So there you have it, Kappa 40 the 'Big K', 1450grs (mine is the carbon 'D' box ley up) of high aspect ratio sailplane, that seems to want to 'fly'. She leaves me wanting to get bak to the field asap to explore more posibilities and refine those that curently show. It also means I will be a better pilot in due course with the 'Big K' as my teacher.

Nearly forgot, the flaps, landing today was not easy, being a bit bumpy in the last 20m or so. Kappa excelled in her stability, responding gently but positivly to every input. Those watching were waiting for here to drop a wing, she simply glides in giving me no cause for consern, as I say, responding smoothly to every input. These landing realy did end every flight with a smile on my face and some very impressed spectators.

Well worth the 5+ stars IMHO


 Review by:

Kappa 40 F5J Spread Carbon

Review of Kappa 40 F5J Spread Carbon.
I decided to spend some cash on a new F5J glider. This is based on the fact you cannot take it with you when you go. Only the best will do and no expense spared. I regularly compete in the Bartletts league and F5J. The first question is what to buy? We are spoilt for choice with all the models available. I had not seen a Kappa 40 in the flesh but it looked good to me when Skip Miller was testing a Kappa 35 on U Tube. I was sold.
I thought that looks competitive and its different. The flying weight was quoted 1315 grams and it look state of art and modern. I am not technical enough to discuss the merits of high aspect wings etc. The advertising says it banks in a very tight circle and it does. The first flight was 10 minutes plus in not very good conditions. I suspect in competition that will change.
I bought the most expensive model from Hyperflight and that was spread carbon model which came in a red/orange livery. It looks very attractive to me. The electric motor is a Leomotion 3007-5000 F5J 6.7:1, YGE 60 Esc, Elevator, Rudder, Ailerons, MKS DS 6100, and Flaps, KTS DS125MG. RX Futaba R617FS. All items new. Total cost 2,500.00 plus or minus a few pounds.
The model came in a large box and well packed. There are no assembly instructions. The standard or manufacture is very good in my opinion.
You need some experience to assemble this model and other models I would suggest. There was a bag of profiled ply bits which I could not fathom. I contacted Neil who came back with a drawing. The drawing showed how to assemble the bits to hold the elevator and rudder servos. I did not like the design so I installed my own design. I then had to install the pushrods for the elevator and rudder. I used some magnets which held the pushrod in place and then ran some cyno down the fuse. The finished installation is a very firm with no slop at all. In my opinion the elevator is the most important servo on the glider.
The next operation was install the motor. The fuse comes with the firewall already installed. The Leomotion motor has a stepped front. You cannot fix directly to the firewall. So I cut a 4mm Circle of plywood and placed over the step. The circle was pre-drilled and stuck to the motor. I then attached the ESC and tested before installing. The fuse nose is very long. To attach the motor I used 2.5mm threaded rod and pulled the assembly into place and then fixed with the motor screws. I ensured there was a good flow of air through the firewall. The next job was to fit the servos in the wings. The wings come with pre-cut holes for the electric connectors. A little bit of filing was needed but it all went together without a problem. The aileron and flap horns are fitted and include the servo control rod. I used wood mounting frames which are glued to the wing with cyno or epoxy. The aileron servos are hot glued in place and the flap servos fixed with screws. It all went together with little fuss. I made the wiring harness and used a multiplex connector for connection to the wing. The wing fits directly on the fuse and then held with 2 bolts. I bought some very expensive Vitoprop but they did not sit against the fuse. Neil would not accept them back as he said they had been used, which they had not. Anyone, going cheap. The CG was back too much. I was going to use a 1300 x 3 x 30C battery but the glider was too light at the front. I had a 2200 x 3 x 30C battery and that was perfect. The CG is spot on. I am about 100 grams over the published flying weight but there is nothing I can do about that. The watt meter showed 37 amps 360, watts which is more than enough. 248 watts a kilo. I could have got away with a 40 amp ESC but the 60 amp will not get stressed. I did many calculations on E-Calc, and it was correct.
I have been advised it Kappa 40 will fly up to 15 20 mph. There is no method of ballasting it, but I am working on that.
My opinion so far is that I am pleased and think it has good potential. I look forward to seeing you on the flying filed.

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