CARF-Models Extra 330SC (3.1m)
www.carf-models.com
26
90mm. The ailerons are really big surfaces, so you should
add 55-60% exponential to the low rate.
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
installation and linkages are not made perfectly, and if a servo gear or output arm strips the
flutter 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 prevent
this for sure, we recommend reduced control travels (reduced by using shorter servo arms, not
by using electronic settings).
The CARF aerobatic models are known for very good and crisp ‘snapping’. The roll rate of the
Extra SC is higher than on any other CARF plane, the ailerons are huge and the wings are light.
So, snaps are fast and crisp, and they stop precisely when you release the sticks…. It’s like an
explosion. 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!
3D capabilities are ‘out of this world’. The huge control surfaces combined with the lightweight
airframe and the huge power reserve let our Extra SC perform manouvers which we, and you,
haven’t even known existed! A great plus is that it has zero wing-rocking tendencies. All kinds of
stalled air flow manouvers are flown with ease, on the other hand, the fast snaps, spins, tumbles
(which need the quick stall and recover) remain breathtakingly precise.
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 8-9% ‘up’ elevator and about 4% of opposite
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 330SC. 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:
Have Fun!
Your CARF-Models Team
Our Extra together with the 3m
SU-31
