Marine Modelling Int 2013 02 THUNDER TIGER NAULANTA PART 1.pdf

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The timber hull former and radio tray parts are accurately CNC cut
down the aft part to accept the mainsail luff, which in turn has a
cord run down inside the reinforcement to make sure it stays in
place. Standard practice for many top racing radio sailboats and
now available on a production kit, there is progress for you. The
instructions are explicit and even detail the lengths of each line
required and offer very well drawn diagrams of linkages, swivels,
bowsies, knots and so on which should make it almost foolproof.

The use of the words ‘one metre’ as part of the product description
of this design will invite comparison with the well-established IOM
class designs in many UK model sailing fleets. The hull is of shorter
waterline length but has overhangs both fore and aft which add to the
sailing speed when the boat is heeled. The entire boat is lighter than
an IOM, at 3.5 kg as compared to 4.00 kg, and it also has a shorter
keel and less ballast weight. The sail area is almost the same as the
‘working rig’ of the IOM class boat which is used in moderate winds
and this nicely balances the sail power available across a range of
wind speeds against the stability derived from the hull resistance
coupled to the righting moment as the boat heels and the fin angle
helps the bulb weight to produce this effort.
The initial potential market for the boat in the UK and worldwide
will be lone modellers who want a practical fun boat but we can
imagine that a number of existing general interest model boat clubs
will take a close look at this package for use as a club ‘one-design’
project. The all-in retail price is exceptional and the three different
highlight colour combinations offer variations whilst remaining
‘one-design’ in character. With the established reputation of the
slightly smaller Thunder Tiger Victoria for both performance and
structural integrity as a recommendation we see a bright future for
this newcomer to the radio sailboat market. Next month we will
continue this review with the radio and winch installation plus on the
water trials. MMI

The placement of rudder servo and sail winch is dictated by the
cut-out position in the timber servo tray plate and any modern
2.4 GHz receiver can be fitted conveniently by the use of Velcro
tape. There is a position for a switch, which will not need to be
waterproof and also a single high capacity 4.8 volt NiMH battery
pack. This should allow ample sailing time without the need for
lakeside recharging.

Thunder Tiger Naulantia
America’s Cup Racing Yacht
Length: 39" (993 mm)
Beam: 6.75" (172 mm)
Sail Area: 744sq in (48 dm sq)
Mast Height: 51.4" (1306 mm)
Overall Height: 67" (1700 mm)
Overall Weight: 7.7 lb (3.5 kg)

The stand legs and booms and cord for rigging

With the keel in position the hull will sit more or less upright on
the stand where it is then easy to place the mast and clip in the
shrouds and backstay on to the chainplates, after which the foresail
boom can be linked to the deck mounted chainplate. At this point
the rig will stand up but needs tuning and once again this is well
covered in the final pages of the instruction booklet. The controls
will need adjusting so that the travel of the rudder is about 30 deg
either side of central and the sails can pay out from almost on the
centre line to about 80% angle from this. Finally make sure that
the left-hand lever on the transmitter operates the sail winch in a
forward and backwards action and the right-hand one the rudder,
working from side to side. The standard convention is to have
the winch stick at full down with the sails tight inboard, so that by
moving the stick forward you let the sails out, and this is easily
arranged via a ‘servo-reverse’ switch common on most modern
radio transmitters.

The sails carry
this extensive