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Aileron differentials
In most gliders when you adjust aileron differentials you set 150 to 200%
more in up travel than down. But in case of F5B gliders in speed task mode
we set both up and down same amount of travel. F5B gliders use very thin
airfoil in wing and also it has very small camber (around 1.2%). It generates
almost no lift in speed task when it glides down wards slope. In other
wards wingfs drag is very small and will not creates big adverse yaw. Beginners always have problem comming out turn in nose up attitude. The one
of the reason for nose up attitude at the exit of turn is too much aileron differentials.
Of course main reason is releasing elevator too late but if this didnft fix
problem then it is most likely you have too much aileron differentials.
In case of left turn if you have too much of
aileron differentials, Drag from left up aileron is more than down aileron in
the right. This create plane to skid to the left and when you move up elevator
it will be same as moving left rudder and up elevator at same time. This will
make tighter quicker turn than you expect and because of this dirty movement
airflow will detaches from airfoil and lose speed. You want to release elevator
early at the exit of turn to come out little wide. But with this setting always
turn too much even if you try not to.
To solve this problem you must set amount of ailerons movement exactly
same for up and down. Then try to role 360 to the right and to the left
and adjust differentials to make straight axial role. In some case you
might even need more down than up aileron to make it straight.
In case of duration task, adverse yaw appears more because wing is creating
much more lift.
You do need 150 to 200% differentials.
I want to fly beautifully and smoothly but it always moves too rough.
Most beginners have this problem.
The main reason is they move stick too abruptly from nervousness.
Another cause is that their gliders deflection angles are set too large.
It is a mistake to make the movement of the aileron large in order to correct
not enough banks by the turn. Then, the airframe rages further. It is wrong
the same enlarging the deflection angle of the elevator to do a quick,
small turn, too.
In the high speed flying it is ideal to use small wing diflection. It will
be less drag and less deceleration.
It is necessary to move CG further back to make it more responsive for small input.
Should set more EXP for ailerons and elevator to make it smooth near nutral
position. (start from-45%)
Smaller deflection makes glider move less abruptly and settle things down.
You should look for the feeling of the glider following your finger movement
with small delay.
There is no sharp response, you might feel it little dullness, It tends
to make big flight pattern and difficult make it compact.
You need to move stick much earyer in order to follow the intended course.
Practice in this setting until you can trace the course then decrease EXP
5% each time you adjust. You will notice your flight became much sharper
as you decrease Exp.
You should be able to fly much sharper and smoother with new found settings.
Do not set mixing with motor switch.
There were a few cases I saw beginner had a elevator mixing set with motor.
I don't recommends this because when you switch off the motor it will make
opposit move and offset the course. It is better to have same attitude
with or without motor power.
Three flight modes
We use three position switch of the Radio to program 1. Speed task 2. Duration
task 3. Normal (Landing)
First finds maximum deflection without any problem with useing End Point
adjust, then use DR for each modes for proper amount of deffrection.
Speed mode
In most case amount of aileron defrection in speed mode is 5mm up and down and Exp setting 30 to 40% .
Elevator setting is about 4mm up and down with 20 to 40% Exp.
Snap flap is about 3mm down at full up elevator.
We hardly ever use negative camber but if you want it use very small up
(1mm)
Duration mode
Camber is set 2 to 3mm down in duration mode, use aileron deferentials to make up defflection about 150% of down deflection.
Elevator neutral possition is about 1mm up than speed task.
Normal mode
Normal mode is without camber and slightly faster than duration settings.
Use this mode when you are going for the landing. This mode should be able
to use butterfly brake. should set aileron and elevator DR higher in order
to steer with down flap. Also elevator neutral is set a little down than
duration task to increase speed a little to make safer landing approach.
You should be able to make fine adjustment by using delay program to cunter
pitch change when you use butterfly.
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Example
FlipFlop5.1 2009
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exp
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FlipFlop5.2
setting
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Settings for AVIONIK B8:
CG - 56-62mm@
settings flaps, ailerons and elevator deviation:
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Speed task
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Duration task
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elevator - 5.1mm from fin,@
up 9.5mm
from fin, down 3mm from fin
- flap (max) (mix from elevator) up +2mm, down -6mm
- aileron mix from elevator same flap
aileron up +4mm ,down -3mm
- flap mix from aileron up +1.5,down -1mm
exp - 0%
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-
elevator - 5.7mm from fin,@
up
11.5mm from fin, down 1mm from fin
- flap -1.2mm,same aileron
- aileron up +6.5mm ,down -4.5mm
- flap mix from aileron up +2,down -1.5mm
exp - 20%
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Data from Sergey Anacin and Star Flight Japan
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This Avionik B08 setting is very interesting.
In most case F5B glider has zero degree incident angle which is mean cord
line of the wing and stab are in same line.
but this stab is set negative angle this makes positive incident angles
in main wing and creates lift. If you fly this setting with flat elevator
it will make loop. In order to fly straight and level this needs about
2mm down elevator to be neutral.
This setting has advantage and disadvantage.
Disadvantage is more elevator drag in straight flight. Advantage is less
amount of up elevator is needed to turn.
Turning and flying straight is about half and half in F5B flying. We know
more drag is created during turn than straight flight.
This maybe a very smart setting choice. Someone might suggest "why
not use flying tail insted"but we know compare to the conventional
tail flying tail doesn't give solid handling around neutral position. With
conventional zero angle setting some time large full up elevator couses
flow separation but this setting reduce amount of up deflection.
I saw Sergey Anacin fly this glider at last world games in Ukraine and
he won the event.
He was flying big oval with almost no straight line in it's flight and
very accurate distance in both end.
It suites perfect with this settings.
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For your safety
F5B gliders have so much power and speed it is very dangerous. You must always follow strict safety procedure.
Connection sequence before the start.
1. Check receiver, receiver battery, ESC and limiter for correct conections.
2. Set receiver battery to OFF.
3. Connect power battery to ESC.
4. Check radio for correct model name and frequency then turn on the radio.
5. Turn on the receiver battery. Now it is armed! If you need to turn off radio in any reason you must turn off the receiver
battery first before you turn off your radio. Always radio must be on before
you turn on the receiver.
Disconnecting sequence after the flight.
1. Turn off receiver battery while radio is still on.
2. Turn off the radio.
3. Remove power battery. It is safe now.
Do not set two switches for motor!!!
Sometime people set two switches for motor, one in each shoulder of the
radio for the ease of throwing plane by themself.
There is potential desaster, Your helper may not know you set two switches
for the motor!!
Please don't do this.
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