Slope-Zone
Link: http://www.slope-zone.de
| Christian Fiedler in cooperation with members of the Aero Club Lichtenfels e.V. end the F3B Team Crossfire. |  |
Architecture and Equipment
Architecture: ( F3B/J-Version )
CFK-Wing
- 2-pieces
- full carbon construction
- UHM-carbon fibre spar
- wing-connector
- room for ballast in wing and -connector
Fuselage with CFK-canopy
- coal-kevlar-architecture
- rudder and elevator-linkage allready set up
Elevators
- moulded construction
- 5mm-CFK-joiner (round)
- flap-/aileron-hinges at wing bottom
- linkage/horns at upper surface
- adjustable tow-hook
All inclusive:
- cables
- connectors
- linkage
- ballast
- small parts
- documentation-CD
- construction-manual
- settings, photos, graphics...
Example for a Set-up-Datasheet ( is included for all flight phases ! )
Newsletter including update-service with setup- and setup-hints via e-mail for free!
Characteristics
Demanded was a agile model with neutral flight qualitys for maximum results in speed- and distance flights.
Good natured handling and an airfoil also suitable for slow flights should allow mastering duration flights.
The chosen arrangement of the aileron- and flaplenghts in connection with giga flaps and the neutral hingeline results in a neutral steering with very good agility for perfect and firm distance- and speedturns.
The optimized hull-lenghts contributes to this as well!
Outstanding directional stability (distance flight) and circle-flight characteristics (thermal flight) are made possible by the incomplex adjusted X-tail.
Who ever flew the same model once with a X-tail then with a V-tail knows what we are taking about!
Last but not least the elementary wing airfoil with 1,7% camber that already works at low wing loadings.
The included 800g brass ballast ( ballast-space in wing ) is usually enough even in heavy wind !
The moderate profile thickness of 8,3% allows harmonic handling and a wide trim-area.
Design
Clear lines are dominating the appearance:
- simple V-shape
- 2-piece wing
- crosstail
Nevertheless or maybe therefore a racy appearance.
.
Especially well done is the design of the fuselage which together with the X-tail is a distinctive identification characteristic.
This is supportet by the chosen ing:
Top:
available color-designs
Bottom:
- Black with white stripes and writing
Development
The Crossfire arised from the idea of making a F3B-competition model which would be accepted and therefore applicable by all members of our F3B-team.
In F3B team performance is a critical factor.
Therefore we wanted to improve our own performances by sharing a common model.
Naturally the use of a common model also simplifies the infrastructure and logistics within the team.
Besides using the same ropes and winch diameter, the direct experience exchange while testing setups and ballast-experimentation improves.
This results in benefits in competition-flights!
A careful optimized concept adjusted to actual requirements of F3B was designed.
The F3B-model: Crossfire!
- Central attribute of the Crossfire is the wing airfoil M1783 by:
Max Steidle. - Design and aerodynamic concept by:
Stefan Eder. - Realisation of the concept for a CNC-moulding cutter by:
CAD-CAM OFFICE.
The airfoils by Max Steidle proved themselves at F3J, F3K and F5B-models for the last years.
Among other things this profile is in use by top-pilots of F3J and F5B at World- and Euopean championships.
A global spread of these M-profiles took place by the ESCAPE of Jaro M?ller (EUROMODELL) at which also Stefan Eder made the design and Max Steidle made the airfoil!
In fact, the Crossfire should have already been deployed at the end of 2003.
But the search for a suitable producer was pretty tough.
After the model-revision a on the F3B-area experienced producer which exclusively fabricates this model in the desired quality could finally be found.