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Never use batteries which are hot, faulty or damaged. Always heed the instructions provided
by the battery manufacturer.
Before every flight be sure to carry out a range check, and ensure that all functions are
working correctly. Note in particular that the motor control function on the transmitter must
first be set to the OFF position before you switch on the system. Always switch on the
transmitter first, then the receiving system, to eliminate any chance that the motor will burst
into life unexpectedly. When switching off, reverse the order: receiving system first, then the
transmitter.
Check that the control surfaces move in the direction which corresponds to the stick
movement:
If you move the rudder stick to the right, the right-hand elevator should move down and the
left-hand elevator up.
Pull the elevator stick back towards you, and both elevators should rise.
Always move the transmitter sticks smoothly - never abruptly.
After each session remove the battery from the model and store it in a discharged state
(approx. 0.9 V per cell) at a temperature of about +5° to +25°C. Batteries should be kept out of
the reach of children at all times.
Please don't misunderstand the purpose of these notes. We only want to make you aware of
the many dangers and hazards which can arise if you lack knowledge and experience, or work
carelessly or irresponsibly. If you take reasonable care model flying is a highly creative,
instructive, enjoyable and relaxing pastime.
Building and flying the CUMULUS XXL
Before you start building the model:
If you are buying a radio control system for this model, check that the transmitter and receiver are
suitable for model aircraft and bear the standard type-approval sticker.
The frequency bands used for radio control systems are shared by other radio equipment and radio-
frequency apparatus, so we cannot guarantee that you will not suffer interference when using your
system.
Individual countries may require you to pay for a licence to operate your radio control equipment. In
Great Britain no fee is payable to operate 35 MHz radio control equipment, but you should check with
your local authority for any by-laws restricting its use. This information may not apply to other
countries.
Your local Post Office or model shop will be able to provide more information on this subject.
During construction
RC components and linkages must be installed when mentioned in the appropriate stage of
construction. Fitting these parts later will be more difficult, and could even be impossible.
The building instructions
The instructions reflect the sequence of assembly and correspond to the sequential part numbers
wherever possible. The following notes are intended to provide additional explanatory information. All
die-cut wooden parts should be carefully separated from their sheets using a sharp balsa knife, e.g.
Order No. 986, and all rough edges sanded off.
All parts must be trial-fitted "dry" (without glue) first, and any trimming carried out. Note that some
parts are deliberately provided oversize. We suggest that you lay out the kit components
corresponding to the major sub-assemblies: fuselage, wing panels, tail etc., according to part number.
To build the model you will need a flat, perfectly straight softwood building board of adequate size, e.g.
the System Building Board, Order No. 645, or the Balsa Jig Board, Order No. 503.
Experienced builders may wish to deviate from the recommended sequence of operations; this is left
up to the modeller's discretion.
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