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Aircraft flight trimming chart, Test procedure, Observations – HITEC Eclipse 7 User Manual

Page 27: Adjustments

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Aircraft(ACRO) Section

27

The following chart may be used to systematically set up and trim a model for straight flight and aerobatic
maneuvers. Please note that for best results, trimming should be done in near-calm conditions. Before you decide
to make a change, be sure to try the test several times before making adjustments. If any changes are made, go
back through the previous steps and verify that they are not also affected. If they are, make further adjustments as
necessary.

To test for ...

1. Control neutrals

2. Control throws

3. Decalage

4. Center of Gravity

5. Tip weight

(coarse adjustment)

6. Side Thrust & Warped

Wing

7. Up/Down Thrust

8. Tip weight

(fine adjustment)

9. Aileron differential

Test Procedure

Fly the model straight and level

Fly the model and apply full

deflection of each control in turn

Power off vertical dive(crosswind if

any). Release controls when

model vertical (elevator trim must

be neutral)

Method 1: Roll into near vertically-

banked turn.

Method 2: Roll model inverted

Fly model straight & level upright.

Check aileron trim maintains level

wings. Roll model inverted, wings

level. Release aileron stick.

Fly model away from you into any

wind. Pull it into a vertical climb,

watch for deviations as it slows

down.

Fly the model on normal path into

any wind, parallel to strip, at a

distance of around 100 meters from

you (elevator trim should be neutral

as per Test 3). Pull it into a vertical

climb & neutralize elevator

Method 1: fly the model as per Test

6 and pull into a reasonably small

diameter loop (one loop only)

Method 2: fly the model as per Test

6 and then push into an outside

loop (one only, fairly tight)

Method 1: fly model toward you &

pull into a vertical climb before it

reaches you. Neutralize controls,

then half-roll the model.

Method 2: fly model on normal pass

and do three or more rolls

Method 3: fly the model straight and

level and gently rock the aileron

stick back and forth

Observations

Use the transmitter trims for hands-off

straight & level flight.

Check the response of each control

Aileron high-rate: 3 rolls in 4 seconds;

low-rate: 3 rolls/6 sec

Elevator high-rate: to give a smooth

square corner; low-rate gives approx.

130 ft diameter loop

Rudder: high-rate 30-35 for stall turns;

low rate maintains knife-edge

A. Model continues straight down

B. Model starts to pull out (nose up)?

C. Model starts to tuck in (nose down)?

A1. Nose drops B1. Tail drops

A2. Lots of forward stick (down elevator)

required to maintain level flight

B2. No forward stick (down elevator) required

to maintain level flight, or model climbs

A. Model does not drop a wing.

B. Left wing drops.

C. Right wing drops.

A. Model continues straight up.

B. Model veers left

C. Model veers right

D. Model rolls right

A. Model continues straight up

B. Model pitches up (goes toward

top of model)

C. Model pitches down

(goes toward bottom of model)

A. Model comes out with wings level

B. Model comes out right wing low

C. Model comes out left wing low

A. No heading changes

B. Heading change opposite to roll command

(i.e. heading veers left after right roll)

C. Heading change in direction of roll

command

A. Roll axis on model centerline

B. Roll axis off to same side of model as roll

command (i.e. right roll, roll axis off right

wing tip)

C. Roll axis off to opposite side of model as

roll command

A. Model flies straight ahead without yawing

B. Model yaws away from roll command

(i.e. right roll, yaw left)

C. Model yaws towards roll command

(i.e. right roll, yaw right)

Adjustments

Change electronic subtrims or

adjust clevises to center

transmitter trims.

Change EPA (for high rates),

and Dual Rate settings (for low

rates) to achieve desired

responses.

A. No adjustment

B. Reduce incidence

C. Increase incidence

A. Add weight to tail

B. Add weight to nose

A. No adjustment

B. Add weight to right tip.

C. Add weight to left tip.

A. No adjustment

B. Add right thrust

C. Reduce right thrust

D. Put trim tab under left wing tip *

A. No adjustment

B. Add down thrust

C. Reduce down thrust

A. No adjustment necessary

B. Add weight to left tip

C. Add weight to right tip

A. Differential settings OK

B. Increase differential

C. Decrease differential

A. Differential settings OK

B. Increase differential

C. Decrease differential

A. Differential settings OK

B. Increase differential

C. Decrease differential

Aircraft Flight Trimming Chart