GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
No liability for printing errors. Technical modifications reserved.
09/2011
10
Sail trim
The foresail of a yacht should always be slightly more open than the mainsail when close-hauled (mainsail
around 10° midships: foresail about 12° close-haule d) so that the airflow from the foresail is directed onto the
rear face of the mainsail, rather than being deflected into the front of it. The optimum difference varies
according to the wind and weather, and can be adjusted on the MICRO MAGIC RTR by adjusting the sheets
and by securing the cleats either on the main boom or the jib boom.
If the boat does not maintain its course in a constant light wind and at a slight angle (heel) when luffing, then
the trim of the rig is not correct, i.e. the centre of pressure of the whole sail area needs to be altered. In the
case of the MICRO MAGIC RTR this is achieved typically by adjusting the mast rake (inclination - typically as
shown in the drawing on the right):
Situation / Behaviour
Solution / Adjustment
Windward tendency (the boat
tends to turn into the wind by
itself (it luffs up)).
The mast is raked too far back, and
needs to be tilted forward (loosen
backstay, tighten forestay).
Leeward tendency (the boat
tends to turn away from the wind
by itself (it bears away)).
The mast is raked too far forward, and
needs to be tilted further back.
Caution: a boat’s tendency to turn into or away from the wind is also affected by the sail settings; for instance, if
the mainsail is set too tight by the kicking strap, or if the foresail is set too close-hauled or too far open.
In general terms sailing boats offer their maximum performance if they have a slight windward tendency. The
optimum setting can only be established by experimenting; please bear in mind that it also varies according to
the weather conditions.
Binding
Before the receiver can be operated by a HoTT transmitter, it must be bound to the Graupner HoTT 2.4 GHz
RF module. This is the procedure in detail:
•
Switch the transmitter and receiver on (the receiver is switched on as soon as you connect the battery and
move the On / Off switch to the ON position).
•
Hold the SET button on the receiver pressed in for at least three seconds; the flashing green LED then
stops flashing.
•
Initiate the binding function at the transmitter (see transmitter instructions): after about one second the re-
ceiver is bound to the transmitter, and the receiver LED glows a constant green.
•
If the binding process fails for any reason, the transmitter LED will glow red instead of blue, and the re-
ceiver LED fails to light up. If this should happen, repeat the procedure.
Maiden run
Wait for a day with optimum wind conditions, and seek out a stretch of water where you can easily salvage the
boat. Charge up the batteries, and check the model’s working systems. Ensure that all parts are securely
attached - that applies to the Cockpit canopy in particular! Now you are ready for the boat’s maiden run. Be
cautious at first, and take your time to get used to its sailing characteristics and handling. Don’t sail the model
too far from the bank initially.
All of us at GRAUPNER hope you have many hours of pleasure building and running your MICRO MAGIC RTR
HoTT.
