3D Hangar · Current R2 package · 31 October 2026
Meadow 620 build guide
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Print and fit prototype: physical printing, installed hardware and flight validation remain outstanding.
What changed
- Added through-bolt holes to both integrated wing servo pads and a one-piece tray for the two tail servos.
- The new tray clears the assembled fuselage and seats on four existing rail lands. Installed count is 18 printed pieces.
- Selected Skywalker 15A V2 and rebuilt both wing test plates and the full wing plate.
These are digital design and documentation checks. No new physical print, load, radio, water or flight tests have been performed.
Before printing
Use the supplied orientation and 100% scale. The 3MF files contain geometry and arrangement, not a validated printer/material profile or ready-to-run G-code. Use the material listed for each plate. Slice with supports off where specified and inspect the first layers, bridges, thin-wall continuity and holes before printing.
Mounting and connection details
Coordinates refer to the assembled CAD datum, not the slicer’s rearranged plate. Dimensions below are millimetres unless stated otherwise.
| Interface | Dimension / part | Assembly action |
|---|---|---|
| ES9051 ears | 23.50 mm pitch; Ø1.8 printed clearance holes for M1.6 bolts. | Eight M1.6 ×6 screws, small washers and nuts total. A nut flat faces the case; verify full engagement and actual ear clearance. Do not enlarge the servo ears. |
| Tail servo tray | Part 18; four 6 mm feet seat at Z−3.5 on existing side rails; ear plane Z10.7. | Bolt servos first, dry-fit all feet, then bond only the feet after a matching material bond coupon. Keep nuts, leads and horns accessible. |
| Wing servo pads | Local X73.4, Y44.35/67.85 before the 4° wing transform/mirror. | Output faces down; fit fasteners before closing wiring. Pads and printed horn roots must remain intact. |
| Motor | Hacker A10-15S2320 KV; two M2 holes on 14 mm centers. | Maximum 3 mm motor thread penetration. A candidate M2×5 with 0.5 mm washer and 2 mm firewall gives 2.5 mm only if the delivered flange stack matches. |
| Control rods | Four 1.2 mm wire runs; eight retained ends. | Support long tail runs. Form/fit ends to allow the different horn axes without binding; cut only after neutral and full-travel checks. |
18-twin-tail-servo-mountREF-tail-servo-leftREF-tail-servo-right04-motor-firewallREF-motor-envelope
07-main-wing-joiner08-rear-wing-joinerREF-wing-servo-right09-aileron-rightREF-wing-servo-left10-aileron-left
Build in this order
- Step 1
Print T01 dense-PLA solid joiners first, then T02 right wing root-down with brim; hand-fit the 90 mm main and 80 mm rear engagement and test the real wing servo before T03 left wing.
- Step 2
Use the five retained full plates, with the R2 wing replacements already included, plus the one Part 18 servo-tray plate. Meadow has 18 installed printed pieces. Keep Aero shells separate from dense joiners; omit accepted duplicate test pieces.
- Step 3
Trial battery, ESC, receiver and tail servos in the open forward body; confirm cable access, battery retention and servo installation before closing anything.
- Step 4
Trial the ASA firewall, real motor shaft arrangement and screw engagement; install aft pushrod guides before bonding the 11 mm keyed body collar in alignment.
- Step 5
Feed leads and engage joiners through the fuselage; slide wings along the designed 4-degree rise and compare both tip heights before bonding root/saddle interfaces.
- Step 6
Use eight M1.6 through fasteners across the four servos. Fit tail servos to Part 18 before bonding its four feet to the existing side rails. Fit wing servos through the revised ear holes. Center horns and check their full sweep; no adhesive-only servo-case retention.
- Step 7
Square the horizontal tail and fin, tape-hinge the control surfaces, and fit positively retained pushrods after neutral alignment.
- Step 8
Fit PETG landing gear through belly slots. The parts manifest specifies bonding it to the reinforced belly after fit/drop tests; retain printed wheels with M2 axle screws and locknuts. Retain canopy with removable tape.
- Step 9
Record actual mass and balance, starting at 31.9-36.3 mm aft of leading edge; perform physical structural, propulsion/BEC, control-direction and radio checks before considering a flying prototype.
- ES9051 servos require regulated 5 V (rated 4.0–5.5 V): do not use 6 V or direct 2S.
- Use the purchased GWS HD6×3 two-blade prop and 2S350 pack. The selected 15A V2 has a25° setting matching Hacker’s20–25° guidance; measure the installed system before flight.
Power and radio setup
- Select a two-aileron wing and verify directions. Stabilization needs model-specific orientation/gain/correction checks; no borrowed preset is supplied.
Keep propellers removed (and Rotor motors disconnected) during setup. Check polarity and regulated bus voltage before plugging in the receiver/servos. Center servos before fitting horns; check neutral, direction and free travel before connecting rods. Configure throttle cut and receiver-loss response, then test them on the installed system.
Fit and bond method
- Dry-fit and mark orientation, contact lands and insertion depth before mixing adhesive. Record actual tube, printed socket and coupon dimensions.
- Use an adhesive whose maker supports both actual materials. Prepare only the intended bond lands as directed; remove dust and let surfaces dry. Do not solvent-wipe a filament without checking compatibility.
- Make matching sacrificial coupons with the same filament, orientation, carbon/wood if applicable, preparation and adhesive. Cure for the maker’s complete schedule and test the joint before committing to inaccessible or structural bonds.
- Bond on an alignment jig. Keep hinges, captive nuts, moving shafts, servo cases, leads and access covers free. Retain evidence of cure, bondline fit and test behavior; no adhesive process or load rating is established by these files alone.
Fasteners and linkage lengths
A listed starting screw length is not permission to bottom a screw in a motor or crush a servo ear. Measure the mount, washer and nut stack; verify locking-thread engagement and moving-part clearance. For a blind threaded motor hole, compare protrusion below the mounting face with the manufacturer’s maximum permitted penetration.
Set servos to neutral and surfaces straight. Install the chosen retained ends with their required thread engagement, measure the ball/pin-center distance, then mark the rod between those actual ends. Viewer centerline lengths are not bare rod cut lengths. Check both travel limits and combined gear/door states before final locking.
What still prevents a completed flying release
- Actual servo fastener/horn sweep, control-end and wheel-axle fit; wing/gear bond strength, current/BEC load, mass/CG and flight tests.
Use the measurement record to report actual fits and test results. A geometric pass is not a structural rating, slicer validation or flight test.
Detailed source guide
Included in ZIP: Retained model-specific source instructions. Current R2 interface and replacement instructions above take precedence where a retained source describes an earlier revision.