during flight, as mentioned earlier in this instruction book. At high rate, for 3D maneouvers, this
doesn’t effect the rolling too much, so you can maximize the throws to whatever is mechanical-
ly possible, even more up than down if you wish. You may need to lengthen the slots in the servo
hatches by 2mm or so at the front to obtain these high rate throws.
General
Your Extra has very large control surfaces. This makes it very sensitive and reactive. It is always
possible that these huge control surfaces can flutter at high speeds if the assembly, servo instal-
lation and linkages are not made perfectly, and if a servo gear or output disc/arm strips the flut-
ter will not stop until the plane hits the ground….
So please do yourself a favour, and make sure that you only use the best servos available, and
take the utmost care making your linkages. Check every linkage for slop, and rather reduce the
maximum throw than risking a high speed flutter due to sloppy servo gear or linkages. To pre-
vent this for sure, we recommend reduced control travels (reduced by using short servo arms,
not by using electronic settings). Using 2 servos per control surface as described in this manu-
al will never overload or damage high quality servos, even if the maximum travel of each servo
is slightly off. The aileron control surfaces have enough torsion flexibility so that damage to the
servos should not occur.
The Composite-ARF aerobatic models are known for very good and crisp ‘snapping’, and we
think that this is also true for the 2.6m 300SX version. It’s like an explosion ... and it still stops
immediately that the sticks are released. Be aware of this fact when you try it for the first time.
The trick for nice crisp ‘snaps’ is to stall the plane with a quick hit of ‘up’ elevator, and then
release the elevator to zero, while you give full rudder and aileron together. But of course, you
know this needs some practice to make it perfect every time !
Perfect knife edge tracking is achieved by mixing in slight up elevator, and opposite aileron to
the rudder movement. From our experience as little as 6 - 7% ‘up’ elevator and 2 - 3% of oppo-
site aileron are needed.
Now your Extra seems to be ready for the first flight. Always keep in mind, that you have a rock
solid, but still sensitive, contest tool in front of you, which, if used as it is designed will give you
many hours of pleasant flights. The performance of this aircraft is unlimited, and if maintained
regularly and carefully, you will enjoy it’s performance for many, many hours. With this aircraft
you have the potential to move up to the unlimited "cracks". It’s up to you now - you can’t blame
it on the aircraft anymore….!
We hope that you enjoyed building your Extra 300SX. Please let us know if you think that any
hardware is missing or inadequate. We tried to make this airplane as complete as possible. With
good feedback from customers you will help us to continue making good things even better. We
appreciate your comments very much.
Email: [email protected]
Have Fun!
Your Composite-ARF Team
Composite-ARF Extra 300SX
(2.6m span)
36
Mike C Mike C (10 Jan 2007)
Mac
