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Inside F5J 2.9m

Product Code: INSIDEF5J
 (16 reviews)

Price: $203.52

3 in stock
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The Inside F5J is a lovely built up laser cut balsa, ply, and carbon kit for competitive F5J flying without breaking the bank. The Inside F5J has been developed from the Introduction F5J with the major changes being improved structure giving a lower weight, six servo wings with outer ailerons, inner ailerons, and flaps and reduced dihedral to give more precise control in windier flying conditions. The reason for the three control surfaces in each wing half is to keep each control surface structure reasonably short so that it does not deform and twist under load, even when using all balsa construction

The Inside F5J is extremely good-natured in climb, in thermals and when landing. It has a good speed range through the use of the AG35mod profile with outstanding cruise and thermal characteristics. Its good control response allows accurate positioning in a thermal and allows the thermal to be tracked easily as it drifts downwind, giving great climbs. The fully articulated wing allows the camber to be decreased when increased speed is required when returning to the field from far downwind.

The 2866 mm (113 in) easy build wing with full camber control and a flying weight from 1100 g makes the Inside-F5J an ideal model for an aeromodeller looking for a high performance F5J plane without breaking the bank. The recommended Hacker A20-22 brushless motor, a 3-cell LiPo with 900mAh - 1300mAh capacity and an Aeronaut CamCarbon 11x6 prop gives many climbs to thermal altitudes. Due to the low flying weight 5s -10s motor runs per climb are usually sufficient.

The central design feature of the wings is the carbon fiber tube, onto which the laser-cut ribs are threaded. Stylish wingtips ensure an elegant surface finish. The balsa fuselage is reinforced in the front area with light plywood. A milled firewall is already prepared for the Hacker A20-22L evo. Apart from the laser-cut components, the kit also includes CFRP spars, GRP nose strips, as well as control rods and small parts. An excellent full scale full colour plan and a richly illustrated German construction manual is supplied. An English translation is here.

Not included in the kit are adhesives, covering material, powertrain and RC components. For covering the model we recommend Oracover Light film. Lots more info in this Inside F5J RCGroups thread. Thanks to Lauri Maalismaa and RCGroups members for use of the photos.

Inside F5J Specifications
Wing span 2.9 m 113 in
Wing area 65.0 dm2 1008 sq in
Length inc spinner 143 cm 56.4 in
Flying weight from 1100 g 38.8 oz
Wing loading 16.9 g/dm 5.5 oz/sq ft
Aspect ratio 12.6
Wing airfoil AG35 Mod
EDA (dihedral) 6.6º
Spinner Diameter 38 mm
Centre of Gravity 87-90 mm from wing leading edge
Controls Rudder, elevator, outer ailerons,inner ailerons, flaps, throttle

Inside F5J Typical Weights
Structure 790 g 27.9 oz
Wiring 25 g 0.9 oz
Receiver 10 g 0.4 oz
Rudder servo 11 g 0.4 oz
Elevator servo 11 g 0.4 oz
Wing servos (6) 60 g 2.1 oz
Speed control 30 g 1.1 oz
Motor 43 g 1.5 oz
Prop & spinner 20 g 0.7 oz
Battery 100 g 3.5 oz
Flying weight 1100 g 38.8 oz

Recommended RC
Rudder & Elevator KST X08, MKS DS6100, MKS HV6100, Blue Bird BMS-105, Graupner DES 427BB
Outer ailerons Ripmax SD100, KST X08, MKS DS6100, MKS HV6100, MKS HV6110, Blue Bird BMS-101AMG, Blue Bird BMS-101DMG, Blue Bird BMS-101HV, Blue Bird BMS-105, Corona DS843MG, Hyperion DS09-SCD, Graupner DES 427BB
Inner ailerons MKS DS6100, MKS HV6100, MKS HV6110, Blue Bird BMS-105, Corona DS843MG, Hyperion DS09-SCD, Graupner DES 427BB
Flaps MKS DS6100, MKS HV6100, MKS HV6110, Blue Bird BMS-105, Corona DS843MG, Hyperion DS09-AMD, Graupner DES 427BB
Receiver 9+ channel rx to match your transmitter
Power 30A - 40A ESC with 4A - 5A uBEC

Powertrain Recommendations
Hacker A20-22L 11x6 prop 3S 900mAh LiPo
Hacker A20-20L 10x7 prop 3S 900mAh LiPo (21A, 1950 fpm)
Dualsky XM2826EA-10 45g outrunner 2S 900mAh LiPo, 10x7 prop
Turnigy C2826-1350 9x4.5 prop, 3S 900mAh LiPo (8.3 m/s, 1660 fpm, 23A)
Mega 16/15/4 direct drive 2S 900mAh LiPo, 10x5 prop
Mega 16/15/5 direct drive 7x5 folding prop, 3S 900mAh LiPo (8.2 m/s, 1640 fpm, 29A)

Reviews 16  

 Review by:

My winter project

As usual, Hyperfight had my kit at my door within two days of making the order.I've just built an Andreas and an Andreas Electro and like these other German kits, the laser cutting and wood choice looks superb. The Inside even has a decent English set of instructions available online too! I'm looking forwards to the build.

 Review by:

This is more of a neal review, i have bought 3 gliders from neal and i live in Australia they have all arived quicker than any parts that i order from australia ( i do live in darwin NT ).i have only opened the box but the lazer cutting is immaculate and the timber is spot on and straight.

 Review by:

Thermal Hunter 2

This is the second half of my review. As stated before, I have used 3mm nylon bolts to secure the fin/rudder, which works - passing through one side of the fuselage, through the fin, and into a captive nut in the other side. I decided against making each wing in 3 parts and feel that was a good choice. Be very careful with aligning the wing joiners, as one of my wingtips was at the right dihedral angle but the root ribs were not perfectly parallel when assembled. I was able to very carefully bend the piano wire a degree or two and itís now a perfect fit. Thanks to other reviewers I was able to avoid the mis-aligned fuselage that was a problem for some. Corona DS843MG were fitted in the wings and seem a quality servo. Bags of space in the nose for radio and flight battery, which was used to adjust the C of G.
Yesterday was cold, sunny and still so was ideal for maiden flight. Test glide from the hand went about 40 to 50 metres first time - wow. Next was another glide launch and gentle power on, which resulted in a 45 degree climb out. At present Iím on a 980kv motor on 2s battery driving a 12 x 6 prop as I plan to mainly use this as a Slope soarer for very light days. After more use I may go to 3s and/or a 1200kv motor. Overall a fantastic quality kit and terrific light wind performance - I just hope that the flaps are effective to bring it down!

 Review by:

First Impression Unboxing Premium

The balsa wood and laser cuts are top quality same a presentation , coloured plans... A joy to watch.The cardboard box is not top, could be buch better, arrived with a puncture that didnt affect the wood. Im actually finishing a 5 meters Minimoa, my next bulding will be the Inside-F5J that Im almost sure will be a pleasure.
Hyperflight was quick in delivery, top service, will buy again.

HyperFlight Comment:
We have recently improved our boxes, so there is even less chance of damage now.
Also note this customer is in Argentina so the box did go half way round the world.

 Review by:


Soundly packaged and swiftly supplied.(Standard, first rate, Hyperflight service).

An excellent kit with clean laser cutting of well selected materials.
Still in the building phase so no flying comments; spent a little time considering wing washout as none is specified by angle adjustment of the wing panels. Concluded from review of other builders on rcgroups that none is needed beyond that built in by planform, tip plate, and possible section change along the wing span.
My only minor gripe would be that the instructions supplied are in German - although it is easy enough to find the translated version on line, - but it runs to rather a lot of pages to print if you want hardcopy.

 Review by:

Thermal hunter

Bought to replace very old rudder/elevator model. Superb quality materials and beautifully laser cut. Very simple and quick build but enjoyable nonetheless. Decided to go for the removable tail to minimise transport damage. When I came to fit the fin, I realised that with two nylon bolts straight through the fuselage and fin I could modify to make the fin removable as well. Just about to start the wing construction and am considering whether the outer panels could be made in two halves as lightweight wings with dihedral are always tricky to transport. Planning to fit Corona DS843MG servos. Canít wait to get it in the air

 Review by:

Can not review because have not got the package since 6/25/2018.

 Review by:

Top quality materials, assembly over the plan on the building board is very quick, very small inconsistency between the plan and the interlocking parts, particularly wing rib spacings. I replaced the wingtip alignment dowel which is shown as steel, with a wooden dowel. The wingtip retaining clips have been discarded in favour of R clips inserted through 2mm holes drilled through these dowels(Modelfixings).The fuselage builds straight and true over the plan, however care is needed when covering to ensure that the film is shrunk evenly both sides and top and bottom, otherwise the very light structure will twist.The wing is much more rigid. CG is correct as per instructions, and flying is straightforward. Good performance, not a cheap kit, but a quality build and nice to fly .

 Review by:

Kit quality

This model is very well constructed and I am pleased with the fast delivery

 Review by:

Quality kit

This is a quality kit. All parts are well--marked and arranged logically on the supplied balsa and ply sheets. Absolutely perfect laser cutting. I've only just started the build, but I don't see how this a/c won't just fall together and fly itself.

 Review by:

Inside-F5J 2.9m KIT

I am very satisfied - fast delivery, high quality kit. I'm sure the model will fly great. I Immediately started assembling. :)

 Review by:

Inside-F5J 2.9m

I am so pleased with my Inside F5J. It is really cheap and flies superbly. Running 6 servos independently in the wing and only a 3s 1300mAh battery. I regularly get >30 minute flights from flat field. 40 minutes the other day and had to force her out the thermal. Everyone at the field likes this model and have been around gliders for years. Very pleased and well worth the money and building effort. Would buy again.

 Review by:

Insider F5J

The Inside F5J is a great kit to build and for the most part is user friendly. All parts are well labeled, laser cut and fit together like a watch. Having built two of them I can say that the only difficulty I had was trying to keep the long fuselage straight and true while building. It is very difficult to get it rite the first time and you don't get a second try. Be sure you build over the plans and pin down as you go. I found it easer to sheet the top of the fuse first while having pinned the bottom to the plans.

 Review by:

Inside F5 J

The Inside is a beautifully manufactured kit. All parts are excellently laser cut and the balsa is also excellent, and so are the plans and instructions.
Will start building soon and look forward to an easy and straight forward building process.

 Review by:

Ordered this from Neil and it was shipped the next day. Very good service. I am still building the kit, so I can only comment on the box contents. Wood selection is good. Laser cutting is excellent. Parts fit is excellent. I am using the English version of the instructions and it has been very clear. Lots of photos help, too.
I would recommend this kit as an excellent build project and considering the comments posted on RC Groups, it should fly well.
Overall, two thumbs up! or five stars, or whatever.

 Review by:

Popular Inside F5J

The kit is easy to assemble and every part fits very precise. Not completed yet but it builds fast. Just download the English manual and there are loads of info on the web on this model.

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