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Kestrel
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Kestrel

Slow landings, long glides, repairs one section at a time

Wingspan
1,500mm
Takeoff weight
2kg
Wing loading
≈61g/dm²
Motor
2814/2820
Battery
Li-ion 4S2P
Propeller
10×6
Tail surfaces
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After signing in · ZIP · 44 files · 35.9 MB

All variants · ZIP · 50 files · 39.5 MB

Question about the build?
  • Direct-drive servos, no pushrods
  • 4° dihedral
  • Repair one section at a time
Printed weight
1,050 g
Takeoff weight
2,000 g
Stall speed
32–35 km/h
Wing loading
≈ 61 g/dm²
Wingspan
1,500 mm
Wing area
33 dm²
Aspect ratio
≈ 6.8
Length
1,075 mm
Motor
2814/2820
Number of motors
1
Battery
Li-ion 4S2P
Propeller
10×6
Number of servos
5
Material
3D-печать (PLA+)

About the model

Kestrel is a 3D-printed FPV plane with a conventional layout, designed for a low landing speed, long glides and high agility.

Kestrel is already flying: it stalls at 32–35 km/h and tops out at about 135 km/h. These figures come from the INAV and EdgeTX flight logs, not from calculations.

The 1.5 m wing uses the SD7062 airfoil and has 4° of dihedral, which is rare for printed airplanes; the control surfaces are driven directly by the servos, with no pushrods. The fuselage and wing are printed in sections that fit a regular printer bed: break a section and you reprint only that one. The printed airframe weighs about 1050 g; takeoff weight is about 2 kg.

Direct-drive servos, no pushrods

The servos sit right at the control surfaces: no pushrods and no pushrod slop, less trimming after assembly and repairs.

4° dihedral

The wing levels itself out of a bank, so the airplane flies calmer.

Repair one section at a time

The wing and fuselage are printed in sections: reprint just the broken one, and the rest keeps flying.

Build notes

A detailed assembly guide with photos is in the works and will appear in this section. Until then, use the printing notes and tips below; if something is unclear, press “Question about the build?”.

Printing:
— All STLs are already oriented for printing (bottom on the bed) — do not rotate them in the slicer.
— Tail: pick ONE variant — control surfaces on breakaway tabs (printed together with the stabilizer and fin; snap off the 0.2 mm tabs after printing) or control surfaces as separate parts.
— Wing: section 3 is printed together with a piece of the aileron on two 0.2 mm tabs — snap them off after printing.
— Servo and pitot covers are printed standing, with the “to bed” mark down; add a 3–5 mm brim to the elevator and rudder covers.
— Take the stabilizer roots, stabilizer links and the tail fuselage section from the same kit edition: the slot and link length are matched.
— The electronics hatch latch is printed (plate and button); the battery hatch latch is bought (thumb screw and insert).
— The aileron servo pocket fits servos with mounting tabs across the body.

Center of gravity: fly it at 33% MAC, 83 mm behind the leading edge of the root chord (the first flight was flown at 30%).

Pitot tube: flight data suggest an airspeed scale correction of about 1.13.

Everything except the printed parts.

Filament

  • PLA+ filament all printed parts

Electronics

  • 2814/2820-class motor 1
  • 10×6 propeller 1
  • ESC 1 · matched to your motor
  • Servos 5 · 2 for the ailerons, 2 for the elevator, 1 for the rudder
  • Flight controller running INAV 1 · test flights: INAV 9.0.1
  • FPV camera and video transmitter 1
  • Pitot tube 1 · airspeed sensor
  • Battery 1 · test flights: Li-ion 4S2P ≈570 g; design target: 6S1P 21700 ≈420 g

Radio system

  • Receiver 1 · compatible with your radio

Hardware

  • Tube Ø6 × 400 mm 1 · removable stabilizer spar
  • Tube Ø6 × 156 mm 1 · fin spar
  • Self-tapping screws 2.6 × 10 mm stabilizer latches
  • Self-tapping screws 2.6 × 20 mm wing panel joint
  • Thumb screw with insert 1 · battery hatch latch

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Version history Version 1.0

Version 1.0 Current 10/9/26

Облётанный комплект для полной печати (сборка №142 от 03.10.2026): 49 STL, уже развёрнутых в ориентацию печати.

Version 0.1 9/28/26

Files of this version: 9
  • Kestrel_эмблемы_комплект.3mf
  • Kestrel_Hatch_ail_LH.stl
  • Kestrel_Hatch_ail_RH.stl
  • Kestrel_Hatch_batt_1.stl
  • Kestrel_Hatch_batt_2.stl
  • Kestrel_Hatch_elec_1.stl
  • Kestrel_Hatch_elec_2.stl
  • Kestrel_Hatch_elv_LH.stl
  • Kestrel_Hatch_elv_RH.stl

Files from earlier versions stay available: if you are building from those drawings, take exactly that version.