A rectangular tube made of fiberglass makes the frame on which all the
other parts as the landing gear, motor holder, tail tube, servo board and
motor accu are mounted.
The tail tube is slightly tapered and made of fiberglass and reinforced
width 4 carbon strips. The tail rotor is driven by a toothbelt from the
first stage of the gear and controlled by a fiberglass rod.
The struts are made of carbon rowings. The skids are aluminium tubes.
The main rotor head ist a soft "rigid" head without stabilizer. It has
a central flapping hinge. The head weights about 105g. The diameter
of the rotor shaft is 10mm.
This head is very easy to fly because of soft damping and tip weighted
rotor blades. Beginners can fly it without problems.
The rotor blade are made of fiberglass and tip weighted. The blades
are 555mm long, weigh about 120g (4.3oz) and have a "S" camber airfoil.
The swashplate and the follower are made of aluminium and have 3*120°
The gear has two stages. The first stage from the motor to the middle shaft
has a toothbelt and a standard ratio of 1:2. The second stage from the middle
shaft to the rotor is done by gearwheels with a ratio of 1:4.1.
The autorotation clutch is in the pinion gear of the second stage.
The Servos are mounted on the servo board which is made as a "sandwitch"
of fiberglass and balsa plywood. Mini-servos with a weight of about 30g (1oz)
can be used.
Any motor motors with a 5mm shaft, a spec. value of about 700RPM/V and a
efficiency of above 80% can be used.
e.g. ULTRA 1600-8(/H) or SPORTS 625/7.
The canopy is made of fiberglass. All necessary cuttings are done.