How to repair the broken Freewing avanti 90mm edf jet,freewing model official store

Freewing Avanti 90mm EDF Jet Repair Guide

This jet uses high-strength EPO foam, quick-detach wings, metal electric retracts, and a 90mm inrunner EDF. Always use foam-safe glue only; regular CA / superglue melts EPO.

Tools & supplies you need

• Foam-safe thin CA + CA accelerator / 5‑minute epoxy / low-temp hot glue
• Sandpaper (240–600 grit), hobby knife, masking tape
• Cyano debonder, isopropyl alcohol
• Carbon fiber strip / tow (for structural reinforcement)
• Zip ties, heat shrink, solder iron + heat shrink for wiring
• Freewing OEM spare parts (fuselage, wing, EDF unit, retract, servo, nozzle)

Step 1: Full damage inspection (do this first)

1. Disconnect the flight battery first for safety.
2. Remove the quick-release main wings, vertical stabilizer, hatch, and EDF shroud.
3. Check 4 critical areas:
   • Airframe: Cracks, separated fuselage, broken nose cone, crushed wing root, split tail / nozzle
   • Control system: Servo gears, control horns, ball links, hidden hinges
   • EDF power: Fan blades, motor shaft, adapter set screw, ESC, wiring
   • Landing gear: Retract motor, shock strut, wheel, gear door linkage

If fan blades are chipped/cracked or the motor shaft is bent: do NOT run it — violent vibration will destroy the airframe and ESC.

Step 2: EPO foam airframe repair (most common crash damage)

Simple crack / split

1. Clean dirt and fuel residue from the break with alcohol, dry fully.
2. Align pieces perfectly, tape them to hold shape.
3. Run foam-safe CA along the joint, hit with accelerator.
4. For load-bearing joints (fuselage break, wing root): Lay a thin carbon strip on the inside after gluing for strength.

Missing chunk / big hole

1. Cut a matching patch from scrap EPO foam.
2. Dry-fit, glue with epoxy or hot glue, sand flush after cured.
3. Sand smooth, fill small gaps with lightweight filler, then repaint to match scheme.

Hot glue is great for fast field repairs; epoxy is stronger for permanent structural fixes. Avoid regular super glue — it eats EPO foam.

Step 3: EDF unit repair / replacement

The Avanti 90mm has a removable 90mm EDF assembly held by screws inside the rear fuselage:

1. Unplug motor wires from ESC.
2. Remove the EDF retaining ring/shroud screws and pull the whole EDF out.
3. Inspect:
   • Bent shaft / cracked blades: Replace the EDF rotor or complete EDF unit (balancing is critical; a damaged fan cannot be safely fixed)
   • Loose adapter: Tighten the M4 set screw on the motor shaft, add a tiny drop of thread locker
   • Burnt motor: Swap the OEM inrunner motor
4. Reinstall carefully, make sure the fan spins freely with zero rub. Do a static throttle test on low throttle first to check vibration.

Step 4: Retract & landing gear repair (weak spot on this jet)

It has ET86 electric retracts with CNC oil-damped struts:

• Gear binding / won’t extend/retract: Check linkage, gear door pushrods, broken plastic bellcrank, or stripped retract gear.
• Bent metal strut: Straighten gently or replace the strut assembly.
• Water/crash damaged retract motor: Replace the retract unit; these are not easy to rebuild reliably.
• Always check gear door alignment after repair — binding doors can jam retracts mid-flight.

Step 5: Servos, linkages and electronics

1. Check each servo: If gears skip or jitter, replace the servo.
2. Ball links / control horns: Replace popped-off or cracked horns; the Avanti uses hidden hinge design, so broken hinge areas need foam reinforcement.
3. Wiring: Inspect for crushed, shorted wires; solder broken wires and seal with heat shrink.
4. ESC: If smoked, bulged, or cuts out under load, replace it with the correct Freewing 6S/8S 120A reverse-thrust ESC matching your setup.
5. Receiver: Re-bind after any major repair, and re-do all servo center / travel / expo setup.

Step 6: Post-repair critical checks before flight

1. Weight and balance: This jet is nose-sensitive after nose repairs; keep CG per Freewing manual.
2. Control surface direction, throw, and no binding at full deflection.
3. Retract full cycle test (extend / retract multiple times).
4. EDF static run test: No rubbing, no weird vibration.
5. All screws tight, especially EDF adapter, spinner, wing lock, and stabilizer screws.
6. Test all LEDs and thrust reverse if fitted.

Step 7: When to buy spare parts instead of repairing

• Fuselage broken in multiple places along the battery / EDF bay
• Main wing spar cracked or split (the carbon/wood internal spar is hard to repair well)
• Shattered nozzle / vector unit
• Bent motor shaft or chipped EDF fan Order official Freewing spare parts (fuselage, wing set, EDF, retract, nose cone, vertical stabilizer) from your dealerFreewing.

Quick troubleshooting table