Trim Chart, Checklists, & Calculators

Aresti
aresti_made_simple.pdf
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Disclaimer: the first two videos are a bit goofy but do a fairly good job of explaining the concepts

Angle of Attack Explained

Vertical Divider

Stalls Explained

Vertical Divider

The 4 Left Turning Tendencies

The 4 Left Turning Tendencies

Flight Trimming 
trim_chart.pdf
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Notes: Trimming must be done with little or no wind. Make multiple tests before making adjustments. Start at the
beginning and work down the list for best results. If any changes are made, go back over the previous steps and verify or
adjust further if necessary as each adjustment can cause earlier settings to change.

CHANGE ONLY ONE THING AT A TIME!!

1. Control Centering: Fly straight and level. Use transmitter trims for hands off straight and level flight. Adjust clevis to
center transmitter trims, or reset computer trims.

2. Control throws: Fly model and apply full deflection of each control in turn. Check response of each control; Aileron hi­
rate: 3 rolls in 4 seconds, low rate: 3 rolls in 6 seconds, Elevator high rate: to give a good and smooth corner, low rate: to
give a loop of approx. 130 foot in diameter, Rudder high rate: 30­35 degrees for stall turns, low rate: to maintain knife edge.

3. Decalage: Power off vertical dive, cross wind (if any). Release controls when model is vertical (elevator trim must be
neutral).
A: Model continues straight down; no adjustment
B: Model starts to pull nose up; Reduce wing incidence
C: Model starts to pull nose down; Increase wing incidence

4.Center of gravity:
Method 1: Roll into a near vertically banked turn
A: Nose drops; Add tail weight
B: Tail drops; Add nose weight
Method 2: (Simple) Roll inverted
A: Lots of down elevator required to maintain level flight; Add tail weight.
B: No down elevator required or plane climbs; Add nose weight.

5. Tip weight: (course adjustment) Fly straight and level upright. Adjust aileron trim for level flight. Roll inverted, level
wings and release stick.
A: Model does not drop a wing; No adjustment.
B: Left wing drops; Add weight to right tip.
C: Right wing drops; Add weight to left tip.

6. Side thrust: Fly away from you, into any wind and pull vertical.
A: Model continues straight up; No adjustment.
B: Model veers left; Add right thrust.
C: Model veers right; Reduce right thrust.

7.Up/Down thrust: Fly normal path into wind, parallel to you, approx 100 yards from you. Elevator trim should be neutral
per test 3. Pull vertical and release elevator.
A: Model continues straight up; No adjustment
B: Model pitches nose up; Add down thrust
C: Model pitches nose down; Reduce down thrust

8. Tip weight:(fine adjustment)
Method 1: Fly model as per test 7, and pull into a small loop (1 only).
Method 2: Fly model as per test 7, and push into a small outside loop (1 only).
A: Model comes out with wings level; No adjustment
B: Model comes out with right wing low; Add weight to left tip.
C: Model comes out with left wing low; Add weight to right tip.

9.Aileron differential:
Method 1: Fly towards you and pull into a vertical climb. Release controls, then do a half roll.
A: No heading changes; No adjustment.
B: Heading changes to opposite of roll command (veers left after right roll); Increase differential
C: Heading changes in direction of roll command.; Reduce differential.
Method 2:Fly model on a normal pass and do three or more rolls.
A: Roll axis on model center line; No adjustment.
B: Roll axis off same as roll same as roll command (right roll, roll axis off right wing tip);
Increase differential.
C: Roll axis opposite of command; Reduce differential.

10. Dihedral: Fly on normal pass and roll knife edge. (left and right)
A: Model holds knife edge; No adjustment needed.
B: Model rolls in direction of rudder; Reduce dihedral.
C: Model rolls opposite direction of rudder; Add dihedral.

11. Elevator alignment with independent halves: Fly model per test 6 and pull into a loop. Roll inverted and push into an
outside loop.
A: No roll tendency when elevator applied; No adjustment needed.
B: Model rolls same in both tests; Elevator halves misaligned. Raise one half or lower the other
according to roll.
C: Model rolls opposite in both tests; One elevator half has more throw than the other. Model
rolls direction of more throw.

​12.Pitching in knife edge: Fly per test 10.
A: No pitch up or down; No adjustment needed.
B: Nose pitches up; **
C: Nose pitches down; Reverse below.
**Alternate cures:
1) Move C.G.aft
2) Increase wing incidence;
3) Add down trim to ailerons.
​MECHANICS CHECKLIST
mechanics_check_list.pdf
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POWER PLANT
PROPELLER
Propeller nut tight
Spinner on tight
Propeller balanced
ENGINE
Hold down bolts tight
Head bolts tight
Carburetor secure
Glow plug tight
Note: carburetor will be "stroked" during the CONTROL operation.
FUEL SYSTEM
Lines connected properly
Line routing , bends, kinks
Tank mounting
Clunk free
 
FUSELAGE
CONTROLS
Throttle control free
Servos mounted securely and tight
Servo hardware tight
Servo pushrods clear of mechanical interference
LANDING GEAR
Main Gear and Nose Gear Hardware tight
Wheels free and collars tight
RECEIVER
Check all receiver plugs for proper seating
Check antenna routing
Check receiver overall crash protection
BATTERY AND SWITCH
Check switch mounting (opposite muffler side of fuse.
Check wire leads for routing and binding and proper hook-up
Check battery crash protection
Check battery voltage
 
EMPENNAGE
VERTICAL STAB
Check all glue joints for rigidity where joined to fuse
Check rudder hinges
Check rudder control horn
Rudder throw will be checked and set under CONTROL OPERATION
HORIZONTAL STAB
Check all glue joints for rigidity where joined to fuse
Check elevator hinges
Check elevator control horn
Elevator throw will be checked and set under CONTROL OPERATION
 
WING
CONTROL SURFACES
Check aileron hinges
Check aileron control horns
Aileron operation will be checked and set under CONTROL OPERATION 2
 WING ALIGNMENT
Check wings center section joint
Check wings for warp
 
CONTROL OPERATION
TRANSMITTER
Check for card in frequency slot on transmitter impound before operating transmitter
Check transmitter voltage meter for proper operating voltage
Check for proper flags on transmitter
Set all trim controls on center
RUDDER AND NOSE GEAR
Check rudder for correct direction ( check also nose gear if tricycle gear) (change transmitter switch if necessary)
Check for proper throw
Check all hardware for tightness ( especially nose gear control horn on shaft)
ELEVATOR
Check for correct direction (change transmitter switch if necessary)
Check for proper throw
Check all hardware for tightness
AILERON
Check for correct direction (change transmitter switch if necessary)
Check for proper throw
Check all hardware for tightness and check aileron control shaft from pushrod connection through trailing edge bearings to connection on aileron. There should be no "slop" in the system.
Check for symmetry in neutral position.
Check all hardware for tightness
THROTTLE
Check for correct direction (change transmitter switch if necessary)
Check for proper throw. Trim down-carb barrel closed. Trim up-carb open to fast idle. Throttle control off for these checks. Throttle full up-carb barrel full open.
Check all hardware for tightness
 
BUDDY BOX OPERATION
TRIM
Set all transmitter and buddy box trim to neutral or center position.
Ensure that the buddy box power switch is OFF.
OPERATION
Check buddy box for proper tracking with main transmitter for Rudder, Elevator, Aileron, and Throttle. Correct buddy box as necessary to track with main transmitter.
RANGE CHECK
Range check transmitter with antenna collapsed and distance of 200 feet.
Check also operation of buddy box through transmitter at the range check.
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