Geronimo 2 F5J 2.5m

Geronimo 2 is new version of the original Geronimo. It is sometimes called the Geronimo II X.

The wing airfoil was changed. Instead of the AD series airfoils the new MID line are used.
The fuselage pod was changed. Its shape in front of the wing differs. Also, the fuselage under the wing saddle is higher. Now it can accept both tail servos. The pushrods are shorter. The common 1 meter pushrods can be used.
The space in the fuselage in front of the wing was increased and it can easily accept the parts of the power unit.
The tailboom is lighter, what decreased overall weight of the model.

The wing and tail cores are produced of fine-grade styrofoam. It is covered with double layer of glasscloth 25 grams/m2.
The spar consists of carbon stips.

The fuselage is of classical design: carbon/Kevlar pod and carbon/glass boom.

The power unit setup is designed so that the model could climb 200 meters within 30 seconds. The power train consists of the Dualsky motor XM2208ECO V2 KV1800, 2S battery and prop Aeronaut 9,5×5 – 10×6.

The info below and the photos are of the original Geronimo, not the Geronimo 2 (AKA Geronimo II X). We confirm we have the Geronimo 2 (AKA Geronimo II X) in stock now. We will update the page when we have time.

The Geronimo is a lightweight electric thermal soarer designed for the Czech/Slovak 2.5m F5J electric glider class. Like the smaller model it borrows many design and technology refinements from discus launched gliders, and the aerodynamic design is well thought out and fault-free.

The nicely finished smooth glass skinned foam core wing has a substantial carbon spar. Each wing half is molded with the polyhedral in place, ensuring a very smooth and low drag surface, and good stability. The small lightweight fuselage pod is of kevlar/carbon construction and can accommodate folding props up to 20″ diameter, allowing good climb rates. The convenient canopy hatch allows access to the electric motor and battery. The rear fuselage is made of a lightweight but long carbon boom, giving excellent flight stability.

The tail feathers have a similar construction to the wings and are in a conventional cross tail configuration, with a fin and tailplane. The tailplane is removable for easy transport. The control surfaces are actuated by servos in the pod using the supplied pushrods. This helps the CG to be correctly positioned even when using a lightweight powertrain.

The light weight, high aspect ratio, generous dihedral and tail moments, make the Geronimo a high performance and easy to fly thermal soarer that flies like a much more expensive design. The modern thin airfoil and four servo wing gives the model a wide speed range. The tough construction and excellent price point make it a very good first competition model.

The kit includes minimal English instructions, but a good set of build photos can be found here. Also see this excellent German build log for lots of useful info. It is for the 2m version but the 2.5m Geronimo uses an almost identical contruction methodology.

Geronimo F5J Specifications
Wing span	2.5 m	100 in
Wing area	43.0 dm2	667 sq in
Length inc spinner	141 cm	55.5 in
Flying weight from	750 g	26.5 oz
Wing loading	17.4 g/dm2	5.7 oz/sq ft
Aspect ratio	15.0
Wing airfoil	AG40, 41, 42, 43
EDA (dihedral)	8º
Spinner Diameter	32 mm
Centre of Gravity	90 mm from wing leading edge
Controls	Rudder, elevator, ailerons, flap, throttle

Recommended RC
Rudder & Elevator	Blue Bird BMS-126WV, KST X08, MKS DS65, MKS DS75, MKS DS6100, MKS HV6100
Ailerons	Blue Bird BMS-125WV, Ripmax SD100, KST X08N, MKS DS65, MKS DS75, MKS DS6100, MKS HV6100, MKS HV6110
Flaps	Blue Bird BMS-125WV, Ripmax SD150, KST X08N, MKS DS75, MKS DS6100, MKS HV6100, MKS HV6110
Receiver	7+ channel rx to match your transmitter
Power	30A ESC with 3A uBEC

Geronimo Powertrain Recommendations
Powerline Micro 1010	3S 650mAh LiPo, 12×8 prop
XPower F2915/12 XLight	3S 750mAh LiPo, 9×6, 10×5 prop
Axi 2220/16 V2 Long	12×6 or 11×7 3S 650 mAh LiPo
Axi 2220/16 V2 Long	14×8, 14×7, 13×7 2S 650 mAh LiPo
Axi 2217/20 V2 Long	11×6 or 12×6 3S 650 mAh LiPo
Axi 2217/20 V2 Long	13×7 or 14×7 2S 650 mAh LiPo
Axi 2217/16 V2 Long	10×5 or 9×6 3S 650 mAh LiPo
Axi 2217/16 V2 Long	12×6 or 11×7 2S 650 mAh LiPo
Mega 16/15/4	2S 600mAh LiPo, 10×5 prop
Mega 16/15/5	7×5 folding prop, 3S 600mAh LiPo (8.2 m/s, 1640 fpm, 29A)

Geronimo F5J Typical Weights
Total structure	490 g	17.3 oz
Wiring	20 g	0.7 oz
Pushrods	11 g	0.4 oz
Receiver	10 g	0.4 oz
Rudder servo	9 g	0.3 oz
Elevator servo	9 g	0.3 oz
Wing servos (4)	36 g	1.3 oz
Speed control	30 g	1.1 oz
Motor	50 g	1.8 oz
Prop & spinner	25 g	0.9 oz
Battery	60 g	2.1 oz
Flying weight	750 g	26.5 oz