Bell P-39 Airacobra RC Model Plane

UPDATE 4 Jun 2025

• Mid Fuse stl had error that blocked aileron horn. New v3 version uploaded

UPDATE 13 Sept 2022

• SPLIT Wings and Rear Fuselage

• Allows all bits to fit on 220x220x200 printer

• Note: Wing1 should to be diagonal to fit on bed

VERSION 3 - MAY 2021 Update

• Full Airfoil / thicker wing / close to ClarkY

• 2 piece Canopy for easier printing

• Better profile Ailerons

• Removable landing gear anti-rotate tabs

• RECOMMEND - Half Travel on Elevator

All STLs refreshed

https://www.youtube.com/watch?v=l0HZ2BEzlS8

https://www.youtube.com/watch?v=YlHsWfz3lmw

FOR DETAIL SEE INCLUDED:

• P39-Instructions.PDF

RC Groups Thread

https://www.rcgroups.com/forums/showthread.php?3358801-Bell-P-39-Airacobra

Plane Specifications

• Weight ~600 grams no electronics

• Wingspan 885mm

• CG position On main spar (but only 2 flights, no further positions tested)

Recommended 3D Printer

• Creality CR10 / 300 x 300 x 400mm

Materials

• PLA or PLA+

• CA Glue

Electronics

• 4ch Rx/Tx

• 3x 9g Servos (HXT900)

• Motor (NTM 35-30 1100KV)

• 30Amp ESC

• 9x6 Prop

• 3S 2200mah battery

Base Recommended Print Setting

Nozzle / Wall Thickness : 0.4mm

Perimeters : 1

Exceptions : (SEE TEXT)

Bottom layers : 2 or 3

Top layers : 3-5

Infill : None

Exceptions : (SEE TEXT)

Generate Support : Off

Exceptions : (SEE TEXT)

Printing Temp : 220 -230degC

At top end of filament recommendation to ensure good layer fusion

Suggested Build Plate : 60degC

Suggest Fan Speed : 0% (improves strength)