38
o
12 . Make sure there are silicone retainers on all the
clevises and that all servo arms are secured to the servos
with the screws included with your radio .
o
13 . Tighten all jam nuts against the threaded clevises on
your control surfaces .
o
14 . Secure connections between servo wires and
Y-connectors or servo extensions, and the connection
between your battery pack(s) and the on/off switch with
vinyl tape, heat shrink tubing or special clips suitable for
that purpose .
o
15 . Make sure any servo extension cords you may have
used do not interfere with other systems (servo arms,
pushrods, etc .) .
o
16 . Secure the pressure tap (if used) to the muffler with high
temp RTV silicone, thread-locking compound or J .B . Weld .
o
17 . Make sure the fuel lines are connected and are
not kinked .
o
18 . Balance your propeller (and spare propellers) .
o
19 . Tighten the propeller nut and spinner .
o
20 . Place your name, address, AMA number and
telephone number on or inside your model .
o
21 . Cycle your receiver battery pack (if necessary) and
make sure it is fully charged .
o
22 . Range-check your radio at the field at the start of each
flying day . Check it with the engine/motor operating .
FLYING
The Zlin 526 Akrobat is a great-flying model that flies smoothly
and predictably . The Zlin 526 Akrobat does not, however,
possess the self-recovery characteristics of a primary R/C
trainer and should be flown only by experienced R/C pilots .
Fuel Mixture Adjustments
A fully cowled engine may run at a higher temperature than
an un-cowled engine . For this reason, the fuel mixture should
be richened so the engine runs at about 200 rpm below
peak speed . By running the engine slightly rich, you will help
prevent dead-stick landings caused by overheating . Keep
in mind also that an engine runs more rich on the ground .
Leaning to peak rpm on the ground can cause overheating
in the air .
CAUTION (THIS APPLIES TO ALL R/C AIRPLANES):
If, while flying, you notice an alarming or unusual
sound such as a low-pitched “buzz,” this may indicate
control surface
flutter.
Flutter occurs when a control
surface (such as an aileron or elevator) or a flying
surface (such as a wing or stab) rapidly vibrates up
and down (thus causing the noise) . In extreme cases,
if not detected immediately, flutter can actually cause
the control surface to detach or the flying surface to fail,
thus causing loss of control followed by an impending
crash . The best thing to do when flutter is detected is to
slow the model
immediately by reducing power, then
land as soon as safely possible . Identify which surface
fluttered (so the problem may be resolved) by checking
all the servo grommets for deterioration or signs of
vibration . Make certain all pushrod linkages are secure
and free of play . If it fluttered once, under similar
circumstances it will probably flutter again unless the
problem is fixed . Some things which can cause flutter
are; Excessive hinge gap; Not mounting control horns
solidly; Poor fit of clevis pin in horn; Side-play of wire
pushrods caused by large bends; Excessive free play
in servo gears; Insecure servo mounting; and one of
the most prevalent causes of flutter; Flying an over-
powered model at excessive speeds .
Takeoff
Before you get ready to take off, see how the model handles
on the ground by doing a few practice runs at
low speeds
on the runway . Hold “up” elevator to keep the tail wheel on
the ground . If necessary, adjust the tail wheel so the model
will roll straight down the runway . If you need to calm your
nerves before the maiden flight, shut the engine down and
bring the model back into the pits . Top off the fuel, then check
all fasteners and control linkages .
Remember to takeoff into the wind . When you’re ready, point
the model straight down the runway, hold a bit of up elevator
to keep the tail on the ground to maintain tail wheel steering,
and then gradually advance the throttle . As the model gains
speed, decrease up elevator, allowing the tail to come off
the ground naturally . One of the most important things to
remember with a tail dragger is to always be ready to apply
right rudder to counteract engine torque . Gain as much
speed as your runway and flying site will practically allow
before gently applying up elevator, lifting the model into the
air . At this moment it is likely that you will need to apply more
right rudder to counteract engine torque . Be smooth on the
elevator stick, allowing the model to establish a
gentle climb
to a safe altitude before turning into the traffic pattern .
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