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For electric power, apply one side of the self-adhesive Velcro tape to the battery tray, the other to your
battery. Use the Velcro strap as a “seatbelt” to hold your battery in position. Always make sure your
battery is firmly strapped down before flight.
Balancing
– Balance your Sukhoi
125mm
behind the leading edge of the wing where the wing meets the
fuselage. On the electric version, move the flight battery to balance as necessary. On a glow version,
you have a wide range of mounting options for the flight battery, from the top of the motor box inside the
cowl back to the fuselage behind the canopy, to move weight to achieve balance. Add nose or tail weight
if necessary to balance.
Remember – It is much more important to have a properly balanced airplane than to save one ounce of
total weight. The Sukhoi carries additional weight very well because of its superior aerodynamic design,
and noseweight can always be removed again if desired. After you have flown several flights, you can
tune your CG to suit your personal flying preferences.
When trimming your CG, keep in mind that a “neutral” CG (one with which you can roll the airplane
inverted and the airplane neither climbs nor dives) is good for 3D aerobatics, but a more forward CG (one
with which you must hold some “down” elevator to keep the airplane flying straight while inverted) is often
better for precision flight and is much easier to land gracefully.
When you experiment with CG location, move the CG only small amounts, 1/8 inch or so, at a time. A
small change in CG can have a large affect on flight characteristics.
Control Throws
- Throws are given both in degrees and in millimeters, measured at the end of the
surface (where the throw is greatest)
Ailerons- Low Rate 24 degrees / 35mm of throw 30% exponential
High Rate 45 degrees / 70mm 70% exponential
Elevator- Low Rate 17 degrees / 40mm of throw 30% exponential
High Rate Maximum possible throw, at least 45 degrees 70% exponential
Rudder- High Rate Maximum throw without touching elevators 85% exponential
We typically use only high rate for the rudder, the high exponential value will help to smooth out rudder
inputs during hover and harrier. Make sure your high rate elevator throw is at least 45 degrees for proper
3D performance. If using 2 elevator servos, make sure your elevators move together in perfect
synchronization, and have the exact same total throw.
Test your power system in a safe manner on the ground before ever attempting to fly your aircraft.
Range check your radio system according to manufacturer’s instructions.
Make your first flight with the controls set on low rates. During the trimming phase, we recommend
landing with some throttle, not attempting to “dead stick” the airplane. This may mean you need to time
your flights and keep them a bit shorter than usual. After your first flights, check all control connections
and motor and prop mounts for tightness.
We hope you enjoy your
3D HOBBY SHOP
Aircraft.
Be sure to look for new aircraft and products coming soon from
