FW4 infopage


Fireworks 4

Photos prototype  

Fireworks 4
Wingspan [mm]:
1 500
Weight (depending on the) [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 (pdf-file 1,1MB, Jun 07)
Templates for easier sanding the airfoil on the stabs (Word-file 0,5MB, Feb 07)

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.

available in 3 versions:
Kit with
carbon wing
from 300g
highest stiffness


Kit with
disser wing
from 275g
für allround use
Kit with
light wing
from 265g
light Version

Innovations and welltried solutions with FW4

Boom alternatively made of high modular carbon
more stiffness » more starting height

According to the forces the diameter of the boom gets bigger to the front
Big fuselage cone » enough space
- 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

Easy access to receiver for changing frequency
Long levers for ailerons inside fuselage » no fluttering  
Broad supporting surface for wing with integrated threads M3 for fixing it
More V-form
- improved thermaling 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)
Automatic connection of the ailerons
- easy hooking in of the levers
- quick assembly and changing of the wing

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  
As with FireworksIII available with or without winglets for disc launch
Wing end without winglets
Wingtip with throwing blade fitted (blade is enclosed in kit)

CNC-milled holes for less weight
Controlling without spring for easier building and secure operation  
Rudder is carrier for elevator » no seperate part » less weight  
Easy assembly due to integrated lever and pinned elevator
Elevator dismountable for easy transport  
New geometry for elevator (Drela)
Thicker rudder for more starting height  
Templates for easier sanding the airfoil on the stabs (Word-file 0,5MB, Feb 07)  
As with FWIII flying tail » always the angle of attack for each angle of the flaps » less drag  
3 VERSIONS with 3 different wings:  
Carbon wing (balsa sandwich with glass and carbon fabric) with stronger spar
Highest stiffness for highest power, app. 155g
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

Protection bags for 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 and carbon fabric (carbon-version)
  • Spar booms made of carbon / shear web made of balsa planked with glass
  • Balsa with CNC-milled holes



  • 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, Bowden wires etc.) are included in kit
  • Outline of stabs is cut, deepening for lever and holes for mounting the elevator are pre-fabricated
  • Building instruction is enclosed

FW4 infopage