Introduction F5J 2.9m

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 11×6 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 X06, KST X08, MKS DS6100, MKS HV6100, Blue Bird BMS-125, Blue Bird BMS-126, Graupner DES 427BB
Flaps	MKS DS6100, MKS HV6100, MKS HV6110, Blue Bird BMS-115, Blue Bird BMS-125, Graupner DES 427BB
Receiver	5+ channel rx to match your transmitter
Power	25A – 40A ESC with 2A – 3A uBEC

Powertrain Recommendations
Axi 2217/16 V2 Long	2S 900mAh LiPo, 12×6
Axi 2217/20 V2 Long	3S 900mAh LiPo, 12×6
Axi 2220/16 V2 Long	2S 900mAh LiPo, 12×6 or 12×7
Axi 2220/20 V2 Long	3S 900mAh LiPo, 12×6 or 12×7
Hacker A20-22L	3S 900mAh LiPo, 11×6
Hacker A20-20L	3S 900mAh LiPo, 10×7
Dualsky XM2826EA-10 45g outrunner	2S 900mAh LiPo, 10×7
Turnigy C2826-1350	3S 900mAh LiPo, 9×4.5
Mega 16/15/4	2S 900mAh LiPo, 8×4
Mega 16/15/5	3S 900mAh LiPo, 7×5

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