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Introduction F5J 2.9m

 (7 reviews)

Price: $172.93

5 in stock


The Introduction F5J is a plane for pilots who love long flights in the thermals as well as for those who love to have relaxing flights and for "come-without-charger-to-the-field" pilots. The Introduction F5J uses the same fuselage and tail as the well liked Inside F5J but with a more stable polyhedral wing with flaps on the centre panel only.

The model uses a tubular carbon spars, precisely lasercut wood parts, a very simple construction (think 3D-puzzle), easy and forgiving take off-, flight- and landing characteristics, large speed range due to the modified AG35 section, ecxellent handling and thermal characteristics.

2860mm wingspan, 920g flying weight, three-part wing with multiple dihedral and attached wingtips, lightweight rudder and elevator constructed in a solid interlocking framework, removable elevator (optional) mounted in front of the rudder, 90° deflectable landing flaps enabling you flying vertical descents, integrated wing connectors in the main spar, innovative (tool- and tape-free) fixation of the outer wings. Vertical descents with deflected landing flaps (90°) and landings avoiding the vortex zone on steep slopes are now possible without any problems.

The recommended drive - containing the BL-outrunner Hacker A20-22L Evo, a 3-cell LiPo with a capacity of 1300mAh and the CamCarbon 11x6 prop - allows a many many climbs to thermal country. Due to the light weight, a motor run time of 5 to 10 seconds per climb is sufficient.

The kit:
Main feature of the model is the tubular carbon spar, onto which the lasercut ribs are kind of "threaded". Stylish wingtips ensure an elegant appearance. Our Introduction F5J has the most beautiful and elegant fuselage of all of our Gruener kits so far and it is consistently designed for the use of small brushless outrunners. The flying weight starts at 920g. Considering a wing with nearly 3 meters wingspan and a wing area of 65dm² (wing loading approx. 14g/dm²) you might imagine the thermal abilities of this design. Due to the long fuselage and the multiple dihedral in combination with the wingtips, the INTRODUCTION F5J has excellent flight characteristics.

The fuselage made of balsa is reinforced with light plywood in the front section. A precisely shaped milled part is already prepared to fix the motor Hacker A20-22L Evo. The kit contains, besides of the lasercut parts, CRP-spars, GRP-leading edges, all the small parts and linkages needed to complete the model. An excellent full scale full colour plan and a richly illustrated German construction manual is supplied. An English translation of the Inside F5J (same fuse as Introduction F5J, but more complex wing) is available here.

Glue, covering film, power- and RC-components are NOT included in the kit. As covering film we recommend ORACOVER or ORALIGHT iron-on film.

Introduction 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 920 g 32.5 oz
Wing loading 14.2 g/dm 4.6 oz/sq ft
Aspect ratio 12.6
Wing airfoil AG35
EDA (dihedral) 12.0º
Spinner Diameter 38 mm
Centre of Gravity 87-90 mm from wing leading edge
Controls Rudder, elevator, flaps, throttle

Introduction F5J Typical Weights
Total structure 600 g 21.2 oz
Wiring 10 g 0.4 oz
Receiver 10 g 0.4 oz
Rudder servo 11 g 0.4 oz
Elevator servo 11 g 0.4 oz
Wing servos (2) 22 g 0.8 oz
Speed control 40 g 1.4 oz
Motor 44 g 1.6 oz
Prop & spinner 22 g 0.8 oz
Battery 150 g 5.3 oz
Flying weight 920 g 32.5 oz

Recommended RC
Rudder & Elevator KST X08, MKS DS6100, MKS HV6100, Blue Bird BMS-105, Blue Bird BMS-106, Graupner DES 427BB
Flaps MKS DS6100, MKS HV6100, MKS HV6110, Blue Bird BMS-105, Blue Bird BMS-106, Corona DS843MG, Hyperion DS09-AMD, Graupner DES 427BB
Receiver 5+ channel Rx to match your transmitter
Power 30A - 40A ESC with 3A - 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)

Recommended Control Throws
Rudder 60mm each way
Tailplane 15mm each way
Flaps 70° - 90° deg down

Reviews 7  

 Review by:


Really quick delivery and although I haven't started the build yet quality appears to be excellent.

 Review by:

Just a lovely floater

First, per usual, the shipping was excellent. UK to NC, USA in 4 days. Always impressed with Hyperflight's service.
This is probably one of the easiest and fastest builds I've ever done. The build is straightforward and easy if you have any building experience at all. I didn't run into those "head scratching/questioning delays". With some building experience, one could follow the excellent German build manual and probably get by. However, the English translation is easy to follow, mostly corresponds with the steps in the German manual, and in spite of the wing build in that translation being for the Inside, the fuselage is identical and the wing is pretty much the same. I worked a couple hours every evening and one full Saturday and was ready to fly in 3 weeks.
My only 2 complaints; The ribs and mid ribs fit rather loosely on the carbon spar, I believe the tolerance's could be a bit tighter and need to be if using thin CA. I would suggest med-thick CA to get a good bond, or even epoxy. As it is, I just don't feel the wing is as "tight" as it could be, though when covered, is sufficiently stiff so this isn't really what I would call a "deficiency" just something that could be better. The second complaint is the motor nose block required some reaming and sanding to get enough clearance for the motor. The wires channel also required milling out. This just to make it all fit. There is almost no ventilation to the motor and heat will build quickly! Keep that in mind when choosing the motor diameter. I've overheated my motor and considering some ventilation options.
Just advice; Also when building the joiners, do one at a time and go slowly being VERY CAREFUL to get both wing panels properly aligned. If the joiner is off slightly, you will have difficulty getting the panels to align perfectly when assembled. Using the clips to adjoin the outer panels to the mid is a neat trick, but you don't want open space between the two and getting everything aligned during the build will assure no gaps.
Now on to flying. At this writing I only have maybe 15+ flights, but I am impressed. She is definitely a floater! A slow easy flyer that uses lift very well. I'm still working out trims but overall I am impressed. One big negative but one which is well known; This plane does NOT penetrate wind well. Much over 10 mph wind and she just stops. It will take considerable down trim just to move forward and personally I find it difficult to hang into lift with more than a breeze, as circling will take you far downwind quickly. But that probably says more about my piloting skills than the plane. Not a good clear way to add ballast other than there is room forward of the wing, but that will affect CG.
Overall, just totally pleased and out of all of my planes, this is the most relaxing and pleasant to fly in calm-light breeze conditions.

 Review by:

Introduction F5J

Amazingly fast delivery to me in Connecticut. I have just started building the Introduction and I was very impressed with the over all quality. The parts just snap out of the sheet and require no sanding and they fit perfectly. It's a well engineered kit.

 Review by:


Great kit very easy to assemble as there is no cutting out to do every part is laser cut to a very high standard
The only problem I had was maintaining the alignment of the round wing joiner

 Review by:

Introduction F5J

Excellent delivery very quick but there was damage to the both box’s. Look as it the instruction manual took the force no damage to the parts.
The kit is excellent quality.
I am so pleased with my introduction to f5j.The build is so relaxing easy to assemble and every part fits very precise.

 Review by:


Excellent delivery.
Kit is excellent quality.
Not done any buildng yet as recovering from knee replacement op.

 Review by:


For us flatlander thermal guys I the Introduction has a slight advantage in light conditions compared to my Inside. Pick your poison, but my go to ship in light lift is my wonderful Introduction.

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