First Flights - GRAUPNER KULT Mini DUO ARC Assembly Instructions Manual

First Flights

Experienced model flyers will now be waiting for the first opportunity to test fly the KULT Mini DUO
and fine-tune the setup to best suit their individual style of flying. The following advice is intended to
help those with less experience to carry out the test flight and successfully trim the model:
Every flying machine, from the most humble chuck glider to the full size aircraft, must be test flown
and trimmed after completion and your KULT Mini DUO is no exception. The slightest deviation in
manufacture or construction can lead to minor variations in flying characteristics and control
responses. Test flying is the means to optimise the centre of gravity and generally fine-tuning the
control response.
Avoid repeated low altitude hand launches on a flat site as this is the most likely opportunity for
damage to occur as there is little time to made adequate corrections when the model is flying close to
the ground.
Ensure that both transmitter and receiver batteries are fully charged and carry out a thorough range test
in accordance with the instructions supplied with your radio control equipment. Do not fly the model
if you are in any doubt about the integrity of the radio control system – seek further assistance.
Faults do not cure themselves!
Test flights can be carried out in several ways depending on the version of the model you have chosen;
at a slope site from a hand launch, at a flat-field site using a winch, or from an aero-tow. In all cases
always launch the model into wind with the wings level and adjust the trims as necessary to achieve
straight and level flight.
Check the centre of gravity once the model is flying at a safe height and comfortably above the stall
speed. Apply down elevator to place the model in a steep dive and then allow the elevator to return to
neutral and observe the flight path:
If it recovers in a gentle upward arc, without any further control inputs and without
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ballooning up above the horizontal, then the CoG can be considered to be about right.
If the model bounces quickly out of the dive and climbs strongly, the CoG is too far
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forward. Readjust the battery position, or remove a little lead from the nose and repeat the
test.
If however the model shows no tendency to recover, or indeed if it shows signs of tucking
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under, the CoG is too far back. Readjust the battery position, or add a little lead from the
nose and repeat the test.
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16
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