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Geronimo F5J 2.5m

Product Code: GERONIMO
 (7 reviews)

Price: $503.04

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Description

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)
Spinner Diameter 32 mm
Centre of Gravity 90 mm from wing leading edge
Controls Rudder, elevator, ailerons, flap, throttle



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



Recommended RC
Rudder & Elevator Ripmax SD100, KST X08, MKS DS65, MKS DS75, MKS DS6100, MKS HV6100
Ailerons Ripmax SD100, KST X08N, MKS DS65, MKS DS75, MKS DS6100, MKS HV6100, MKS HV6110, Corona DS843MG, Hyperion DS09-SCD
Flaps Ripmax SD150, KST X08N, MKS DS75, MKS DS6100, MKS HV6100, MKS HV6110, Corona DS843MG, Hyperion DS09-AMD
Receiver 7+ channel rx to match your transmitter
Power 30A ESC with 3A uBEC



Geronimo Powertrain Recommendations
Powerline Micro 1010 3S 600mAh LiPo, 12x8 prop
ADH300L Front Mount 3S 500mAh LiPo, 9x5 prop
ADH300L Front Mount 2S 600mAh LiPo, 11x6 prop
Dualsky XM2826EA-10 45g outrunner 2S 600mAh LiPo, 10x7 prop
Turnigy C2826-1350 9x4.5 prop, 3S 600mAh LiPo (8.3 m/s, 1660 fpm, 23A)
Mega 16/15/4 direct drive 2S 600mAh LiPo, 10x5 prop
Mega 16/15/5 direct drive 7x5 folding prop, 3S 600mAh LiPo (8.2 m/s, 1640 fpm, 29A)

Reviews 7  


 Review by:

A very good glider. Like a big DLG. Optimal size, light, full house and cheap. One of the best you can choose.


 Review by:

Geronimo Glider/EGlider

I bought a Geronimo EGlider a few weeks ago now. My intention was to use it as a lightweight floater for calm weather sloping/thermalling at Burton Dassett Country Park. It is a larger version of the Saphire, which I have built as an E-Glider and have been very pleased with.

I would like to give the model 5 stars, and if my review was on performance alone it would get 5 stars in a heartbeat. Probably the best way to summarise my experiences are to write a set of 'good points and 'not so good points', so here goes:


Good Points
Fabulously lightweight, and aerodynamic airframe
Converts to a pure glider easily with little noseweight required
Flies beautifully
Stays airborne in the slightest hint of lift when just about all other models give up.

Not so good points
Incomplete parts packs. A bag of 2mm threaded rods was completely empty and the clevices for the wing linkages was one short.
Scant instructions, so definitely not for the novice builder.
The control horns for the flaps were way too short making it difficult to make the linkages slop free.

The model is perfect as a light wind glider for the slopes, but it isn't strong enough to take a bungee launch, so don't try!

I have taken a series of constructional photographs of varying quality and posted them with a share by share alike licence on Wikimedia Commons under the category Geronimo Glider/EGlider.

Overall, this is a truly fab model, and I am considering buying another to use as an EGlider.


 Review by:

I ordered a Geronimo and associated parts just after Christmas. The box arrived in Australia in perfect condition a week later and after another week of building and tinkering I've successfully flown it today. As the instructions say, with the CG in the specified position the Geronimo flies first try without problems. Flying conditions weren't that great so not much to report on performance other than that it seems to float as well as I'd hoped.

The build is not difficult but is a bit tricky in places, and the instructions are a little sparse. The photos on the web help. The supplied parts don't quite match the instructions eg the supplied 2 mm aluminium rods for aileron and flap pushrods don't have threads and I don't have tools to make threads. I ended up using the left over 2 mm carbon rod instead with short wire ends to the servo horns. My all up weight is 810 g including 40 g nose weight to get the CG correct (I think I chose an overly-light motor and it lacks power, but that's my fault!).

Overall a very satisfying experience - quick delivery, excellent quality model.


 Review by:

Good!


 Review by:

Good!


 Review by:

The plane looks well made, especially nice wings. I have not started building it yet but there should be no problems. It arrived in a very nice stout outer box which protected the contents very well. The delivery took less than a week, which is outstanding.


 Review by:

I have had the Geronimo for a month or so. I bought it after being very impressed with my Sapphire. The Geronimo is the same style and manufacture in a larger size. Same high quality, beautiful fuselage molding, nice light boom, and flying surfaces are vac bagged glass skins on fine grain white foam. Not molded quality, the LE and spar skin reinforcements can be felt, but not molded model price either. Very light.

My initial plan was to extend the model to over 3m. I built an extra centre wing panel and larger tail surfaces, as well as moving the tail surfaces as far aft on the boom as possible, with a slightly larger motor this brought the weight up from 860g to 1.2kg. I flew the model this way several times, trying different tail combinations with the new and kit surfaces, but was not really happy. So I reassembled it with the original kit wing and tail panels and flew it again. I was so impressed that the model will now remain in this configuration. I have now put in a smaller motor and weight is down to the advertised number.

Very impressive model. It flies almost as well as my larger molded Kappa 35, at half the price.


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