2014 IMAC Basic Sequence

2014 IMAC Basic Sequence
10 figures
We will work on the first 5
Aresti System
• The pictures describe the path
of the plane.
• For RC aerobatics, the path is
wind corrected. The CG of the
plane must trace the path
shown, even if the fuselage is
not aligned with that path.
General Tips for Precision Flying
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Practice a lot – but practice right
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Set up your plane correctly
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Get advice from an experienced pilot.
Repeat a figure as many times as it takes to get it right.
Use all the controls – the left stick is as important as the right stick.
Don’t stay on the ground when it’s windy. If you can land safely, get up and practice!
Adequate power is a must
Choose a propeller that gives you adequate thrust in the up lines, braking in the down lines. Top
speed in level flight is not helpful for a precision aerobatics plane. Being able to maintain a constant
speed through each figure is much more important.
Think small with control throws – the setup you use for 3D will not allow for the maximum
smoothness that is rewarded in precision flying.
Make control linkages tight and with the best mechanical advantage for smaller throws.
A small amount of “push” inverted is usually desirable and indicates that the CG location is
approximately correct.
Aside from the push in an inverted orientation, the plane should go where it’s pointed and stay
pointed that way with minimal inputs. If it doesn’t, adjust thrust line, CG, angles of incidence, etc
(there’s too much to discuss here). Use of mixes should be minimal. Better to get the mechanical
setup correct.
Get the plane set up right but don’t let that get in the way of practice. A 90% plane is good enough if
the pilot has practiced. A 100% plane is no good if the pilot has no skill!
Think ahead – each figure sets you up for the next figure.
Be smooth – jerking the sticks around will lose you points.
Flying straight and level
Why worry about it?
1. Every figure begins and ends with a horizontal line.
2. Horizontal lines connect the figures.
3. Judging starts when you enter the box and continues until you exit the box. You
lose points if you’re not actually straight and level between figures.
Straight and Level Common Errors
• Having the near wing pointed down – if wings are level you can see the bottom –
remember the plane is above you
• Gaining or losing altitude
• Not wind correcting – corrections are made with rudder, NOT with ailerons
WIND
INCORRECT
CORRECT
• “Hunting” in any axis – pitch, roll, yaw – every deviation is a deduction
• Flying at full throttle – hurts noise score and forces you to rush the sequence
Full Roll on a Horizontal Line – “Proper” Method
Common errors:
• Roll not axial (straight line)
• Change in roll rate
• Stopping too soon or too late
Neutralize
controls
Add rudder
in other
direction
Down elevator
(push) to maintain
altitude inverted
Add rudder to
hold altitude
in knife edge
Aileron input remains same through maneuver. Rudder & elevator are
increased & decreased smoothly to maintain altitude.
Aileron to
begin roll
Full Roll on a Horizontal Line – Practical Method for Beginners
Common errors:
• Roll not axial (straight line)
• Change in roll rate
• Stopping too soon or too late
Neutralize
controls
Down elevator
(push) to maintain
altitude inverted
Small pull on elevator
then release and
immediately follow
with aileron
Aileron input remains same through maneuver. Elevator is used to pitch nose up
imperceptibly before each knife edge position. Roll must be fast enough so that
plane does not fall off in knife edge and judges don’t catch elevator “bump.”
Shark Tooth
Reduce power to
idle AFTER you are
past the top of the
maneuver – exact
time depends on
plane.
Roll must be at mid
point of 45° down line
Common errors:
• Roll not centered
• Change in roll rate
• Stopping roll too soon or too late
• 45° too shallow
• Not pulling out of 45° level
In IMAC entry and exit
can be at different
altitudes; in pattern they
must be the same
Full power
Underpowered plane full
throttle BEFORE up line. High
powered plane, smoothly add
power AS you pull up.
Mid throttle before entry
Back to mid throttle
as you pull to level
Humpty Bump
Common errors:
• Roll not centered
• Stopping roll too soon or too late
• Half loop at top not consistent radius
(note: full size planes tend to “flop” at
the top of this maneuver. RC planes
have enough power to make a good
radius so use that power)
• Not drawing line – rushing to pull up
due to inadequate altitude at top
• Not pulling out level
Reduce power to idle AFTER
you are past the top of the
maneuver – exact time
depends on plane.
Full
power
Roll must be at mid
point of down line
Mid throttle before entry
Underpowered plane full
throttle BEFORE upline. High
powered plane, smoothly
add power AS you pull up.
Back to mid throttle
as you pull to level
Loop
Common errors:
• Egg shaped, E-shaped, segmented
or other non-round shapes
• Entry and exit altitudes don’t
match
• “Corkscrew” in a crosswind
• Not level on pull out
Reduce power to idle AFTER
you are past the top of the
maneuver – exact time
depends on plane.
Start to add
more elevator
Begin to ease off of
elevator to “float”
the top
Full power
MAKE CONTROL INPUTS SMOOTHLY –
ABRUPT CHANGES WILL UPSET THE
PATH AND CAUSE THE LOOP TO BE
SEGMENTED INSTEAD OF ROUND
Add power
Underpowered plane full throttle BEFORE
start of loop. High powered plane,
smoothly add power AS you pull up.
Hammerhead
Pull up, vertical up, vertical down
and pull out handled the same as
other figures.
Common errors:
• Cutting throttle to full idle with no
“blip” – plane flops over
• Not cutting throttle enough –
performing a fly over – plane must
pivot within its wingspan
• Rotation in yaw or pitch
If the judges are honest and thorough, your scores
will be low your first time competing.
It is generally harder to judge Basic than the higher
classes because the deductions add up so quickly!
Almost everyone scores a zero sometimes. If you
don’t, you should move up a class.
Don’t be embarrassed. Just keep practicing.
http://www.modelaircraft.org/files/2013-2014RCScaleAerobatics1-1.pdf
http://www.modelaircraft.org/files/2013-2014RCAerobatics.pdf
http://mini-iac.com/
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