FW4 infopage


Fireworks 4.2

Photos prototype  

Fireworks 4
Wingspan [mm]:
1 500
Weight (depending on the version) [g]:
app. 260 - 330
AG455ct-02f - AG47ct-02f

Our current DLG-model for use in competition F3K and for funflying at weak thermal condition.

For more technical information have a look at our Building instruction FW4.2 (pdf-file 1,6MB)

David Kauran
takes 3rd place with Fireworks in the Euro-Tour (victories in Celje, Ludbreg and Zapresic, second places in Waidhofen and Reiselfingen) and is winner of the Austrian Cup.

2008: Victory at the French Championship by Rudy Peters, victory at the Italian Trophy by Francesco Menozzi and many more.

available in 3 versions:
Kit with
carbon wing
"Carbon Lite"
from app . 285g
for allround use
Kit with
disser wing
from app . 275g
for allround use
Kit with
light wing
from app . 260g
light version
Kit with
carbon wing and CFR-stab

Fireworks 4.2 carbon lite, September 2008
Test model with 285g flying weight

We have managed to create Fireworks 4.2 in full carbon version with a flying weight of 285g!

The trick of this success is a special CFR-fleece, which we use on the inner side of the shell of the wing and in the stabilizor. As we have now saved weight on the inside of the shell, we can use the stiff 65g carbon fibre on the outside, which provides a resistant surface. The robust rudder and elevator are built with a shell of fleece and balsa. They have a weight of around 14g (weight including spring, CFR-rods etc.). The spring that brings the elevator back inot position is made of 0,8mm steel wire to ensure a fast and exact reserve. The higher force can easily be held by the Dymond D47 servo.

The result of less weight with constant stiffness:

  • depending on the strength of the thrower and of the wind better starting heights. We threw our test model on a day with low wind about 4m higher than the comparative model with disser wing. If you are a strong thrower and throw in windy conditions, you will gain even more starting height.
  • with 285g FW4.2 is thermalling clearly better than the normal CFR-versions with more than 300g
  • CFR-wings have a longer life than GFR-wings
  • advantage at midair-collissions

The test model: the 280g aren't lacking anything:

  • the fuselage has a ballast box, in which you can put up to 80g without problem. Of course, you can place a logger or a vario there.
  • we used 2 great FS60 for the ailerons -> big deflections and exact reserve are possible -> breaks are very effective
  • receiver: the big MZK-Sexta
  • accumulator: GP-350mA/h
  • servoboard enforced with carbon fibre
  • fuselage front part enforced with addiontinal CFR-rovings

Now available as series model!

According to the forces the diameter of the boom gets bigger to the front
Boom alternatively made of high modular carbon
more stiffness » more starting height
Big fuselage cone » enough space

(Photo version Fireworks4)
- for 4 big servos (f.e. Graupner C261, Dymond D60)
- for big accumulators (350-400mAh, d=10,7mm, l=29mm)
- for big (and secure) receiver (f.e. Schulze 835, MZK Sexta)
Box integrated inside the fuselage for
- ballast
- logger (f.e. Logo, Lolo, Ram3)

CNC-milled radio board with access from both sides for tidy mounting and quick changing of servos

How to install 2,4 GHz
Easy access to receiver for changing frequency
The canopy and the servo board have been moved as far as possible to the front of the fuselage (from version Fireworks 4.2).
Now you need less lead in the nose of the fuselage and the total weight can be reduced.

Long levers for ailerons inside fuselage » no fluttering
Broad supporting surface for wing with integrated threads M3 for fixing it
(Photo version Fireworks4)
High V-form
- improved thermalling characteristics
- less corrections when thermaling » more performance
Spar boom on the outside of the shell » more stiffness
Stiff ailerons due to
- carbon hose up to the outside of the shell
- PU-foam-enforcement inside the aileron
» no fluttering
Elastic flaps
for better aerodynamics
(except carbon wings)
Gap sealing with adhesive (prefabricated)
For joining of the ailerons there are levers to be hooked in on the downside of the fuselage.

Fence between aileron and fuselage for optimal aerodynamic transition
Optimized carbon grid » same torsion stiffness with lower weight
Optimized carbon fabric enforcements » same stiffness with lower weight
Countersinked screws M3 for mounting of the wing
Crossbeams on downside for better visibility
Available with or without winglets for disc launch
Wing end without winglets
Wingtip with throwing blade fitted (blade is enclosed in kit)

3 VERSIONS with 3 different wings:
Carbon wing, light version (balsa sandwich with 65g-carbon fabric and carbon fleece)
Highest stiffness for highest power and robust surface, combines maximum stiffness with low weight, app. 140g
for highest starts
best flying quality on windy days
longest flying-distances possible
fastest gliding through downdrafts

Disser wing (balsa sandwich with glass fabric and grid of carbon rovings) with stronger spar
The allrounder, app. 130g
high torsion stiffness at low weight
good stiffness of the ailerons, no warp

Light wing (balsa sandwich with glass fabric)
Low weight
and good stiffness » for smooth thermal days, app. 125g
longest flights on windless days (floater)
higher starts also for untrained pilots

Fireworks 4.2 is alternatively available with balsa-stabs to sand yourself or ...
... or with CFR-stabs using carbon fleece made out of moulds.
- The CFR-stabs are nearly completely pre-fabricated.
- The mechanismus inside the rudder for controlling the elevator is ready installed.
- The weight is about 14g.
- The elevator is dismountable.
Thicker rudder for more starting height  
As with FWIII flying tail » always the angle of attack for each angle of the flaps » less drag  
Small parts enclosed in the kit
4 pieces of GP NiMH Accu 35AAAH are ideal for Fireworks.
Protection bags for the wing

  • CFR, high modular carbon (depending on version)
  • Shell made of balsa-sandwich with glass fabric (light-version), with glass and grid of carbon rovings (disser-version), with glass of carbon fleece and carbon fabric (carbon-version)
  • Spar booms made of carbon / shear web made of balsa planked with glass
  • Balsa with CNC-milled holes
  • Shell made of balsa-sandwich with carbon fleece



  • Ailerons are cut and mounted with elastic flaps
  • Gap sealing of aileron with adhesive
  • Screw mounting for wing is pre-fabricated
  • Rear and front part of fuselage are glued together, openings are cut
  • Kitparts (radio board, pushrods, levers etc.) are included in kit
  • Outline of balsa stabs is cut, holes and deepenings for mounting are pre-fabricated
  • GFR-stabs completely prefabricated apart from: mounting the lever for rudder
  • Building instruction is enclosed

FW4 infopage