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mini-Joker
Technical datas
fully aerobatic electric helicopter for 6-10 Lipo cells
main rotor diameter: 1250 mm oder 1350mm (49"-53")
for 550mm or 600mm rotorblades (22"-24")
tailrotor diameter: 250 mm
Weight without flight battery: 2,6 kg – 2,7 kg
(5.7 - 5.9 lb)
Video
- mini-Joker ( 8,9 MB, .wmv)
Concept
With the aim of lower flight costs and a large range
of possible drive combinations a completely new model
was developed which was based on the innovative and
durable design of the Joker 2. The fundamental design
concept was for bullet proof mechanics with long life
as well as an extremely low noise level. The unconventional
layout of the carbon frames results in a significant
increase in stiffness, also giving greater battery and
radio protection. The mini-joker, like its bigger brothers,
has a very wide range of use that covers the spectrum
from a high stability beginers model, to pilots that
like to do a lot of flying and thus require industrial
quality mechanics, to lovers of the art of CNC machined
mechanics, to 3D pilots looking for new challenges exploring
the outer limits of the flight envelope which are made
possible by the extremely powerfull drive systems that
are available for this model. With a little carefull
maintenance the mechanics have a life of many hundreds
of flight hours whilst the number of service parts has
been kept to a minimum and it is by this means that
the long term use of the mini-joker is made very
cost effective. You will find that the most commonly
crash damaged parts are made from
aluminium. Carbon fibre parts such as the tail boom
and landing gear are available as an option.
Drive
Brushless-motor with 5mm-shaft, recommendations: Köhler
actro 24-3, Kontronik Tango 45-07/8/10, Plettenberg
Orbit 25-12, 30-12
two stage gear with quiet belt drive in the first stage
and spiral toothed gear in the second stage. Gear reductions
from 8.75 to 11.7:1 (stock=10:1) depending on motor
, number of cells, rotor diameter and specific use
Adjustable motor mount for easy adjustment of drive
belt tension.
Can be assembled to give either lefthand or righthand
rotor direction.
The autorotation clutch is in the second gear stage,
to give a driven tailrotor in autorotation,
stationairy tailrotor during AR is possible by changing
some parts (optional).
tailrotor drive direct from the main shaft, giving
a quiet and low-friction transmission. Tailrotor transmission:
4.89:1.
Extremely precise, very quiet running main gear, fully
enclosed by the canopy.
Tailrotor drive using quiet toothed belt and double
ball-raced belt guide rollers.
Additional guide roller on the tailrotor to prevent
the belt from jumping.
Tracking shims on the taildrive wheel for additional
belt drive security.
Fully ballraced with easy to change flanged bearings
throughout,
The mainshaft bearings are widely spaced to give maximum
transmission of torque from the drive shaft into the
system
The upper frame is designed to take standard size servos.
Tail-rotor
one piece CNC housing
low weight
easy to service
fully ball raced
double bell-cranked tail rotor linkage with separate
arm ("scissors linkage"), uses 4 ball races
tailslider with steel joints
alternatively right of left side mounting
CF-side fin
CF-elevator fin
Aluminium blade grips with pmw (propellor momentum
weights) - for reduced servo load
two radial bearings and one thrust bearing in each
grip
rigid hub with 5 mm arms
Frame
extremely stiff 2 mm carbon frame highly resistant
to both bending and twisting.
all spacers with weight reduction cut-outs.
By using spacers the lower battery mounting frame can
be enlarged/adjusted to fit both current and future
battery types.
Full aluminium landing gear with stainless steel clamps.
battery fixing with tie-wraps.
central positioning of receiver in the lower frame
for short and simple cabling from servos/gyro/esc
All essential mechanical parts are mounted in the upper
frame, so for special use like camera-ships the lower
frame can be removed.
Battery carrier with a minimum of holes in a sandwich
design for maximum battery protection, 66 mm wide, 44
mm high, the height can be simply enlarged with spacers.
Gyro and tailrotor mounting in the upper frame.
Flying
For beginners and weekend flyers
For intensive fliers
For 3D-pilots
For camera use (super low vibration level)
Kit content
CF-frame
Aluminium landing gear
main gear
swashplate
mini-MFS-mainrotor head
tailboom with CF-support
CF-Tail pushrod
CF-fins
tailgear with double bellcrank linkage
tailrotor with tailblades
white fiberglass canopy (yellow, red, green optional)
with marked edges for air intakes and windshield edges
battery mounting straps
small parts
decal
manual on CD-ROM
Mini
Joker Page 2
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