Rotor heads with three or more rotor blades really deserve their own chapter in
any discussion of model helicopters; speculation is always in the air at such
times, because sooner or later most pilots feel the need to try a model with a
multi-blade rotor head.
In general terms the current generation of
multi-blade rotor heads bears little comparison with earlier designs, and this
applies in particular to their handling in the air.
These rotor heads are
manufactured using a special mixture of fiber glass reinforced plastic. They are
moulded with the blade holder shafts integrated in one process. The resulting
flexibility and damping from this process is the key to the good quality of
these rotor systems.
The special blade holders with two blade mounting bolts
produces an extremely smooth-running system, already during the acceleration of
the rotor. When a rotor experiences changes in load or rotational speed, the
rotor blades try to swing forward or back; this causes imbalance, as the blades
do not carry out these movements evenly. The double blade mounting eliminates
this movement. The tendency of the rotor blades to "go their own sweet way", as
the laws of physics act upon them, is effectively damped by the inherent
elasticity of the centre piece.
Some scale models may weigh twice as much at
take-off as a typical trainer helicopter. Even though the latest technology is
used (or perhaps precisely because this technology makes it possible), these
models have one thing in common: the heavier they are, the more demanding they
are to fly. In such situations the pilot needs all the help he can get, and this
is where a Helicommand Ord. No. 3270 helps, as it can reduce the model's demand
on the pilot and bring them close to normal levels.
The swashplate of every
mechanics is useful for the linkage of 2-blade-, 3-blade- or 4-blade rotor
heads. An exception are the 5-blade rotor heads due to the necessary arrangement
of drilled holes in the inner ring of the swashplate; therefore a special
swashplate is necessary for those.
For the T Rex700 and Chaos 700 be sure to
purchase the V76/19 1 bolt 5mm blade grips as a direct replacement for the 2
bolt blade grips. Does not come with swash or follower.