3D model description
This is a fully 3D printed RC 727-200
SALE 20%: https://www.troymcmillanrc.com/727-200
I designed this to be a great first plane to get into the hobby of 3D printing your own RC plane.
Build Volume required is 200x200x200.
RTF weight: 780g (LW-PLA w/ 4s 200mah)
Wingspan: .8m
Length: 1.1m
I have a full step by step assemble guide on my YouTube channel.
This build uses a single 50mm EDF in the tail of the fuselage this keeps the plane light weight and inexpensive to build.
This build can be built using LW-PLA or PLA.
LW-PLA is lighter at 780g you can fly with less power and longer flight time.
PLA is 1100g w/ the landing gear
I designed a servo bracket inside the wing that uses a 3mm carbon rod to control the aileron this allows for no control rods on the bottom of the wing to catch on grass when landing.
Flaps
My favorite part to this design are the flaps. The 727 has duel flap system on the wing. I wanted this scale look and function without the added weight of servos and linkage. So I designed a simple solution to be able to print the wing as a flaps up configuration. Or you can simple cut along the integrated flap panel lines and print out the four flaps included then glue them into place. This will be a takeoff flap configuration wing.
Landing Gear
(40g printed w/ PLA)
I first designed this plane to have no landing gear. From experience I know how painful it is to hand lunch on the maiden flight after all that work to build the plane so I decided to include a fix set of gear with no nose steering. Think of it as a lunch dolly for your 727. If you add them for the maiden flight then later want to remove them you can cut them off.
This build does require an 8mm carbon fiber spar 370mm in length. I designed a 3d printed spar I include in the files I have not tested it on a flight but feel free to test it out if you would like the wing is plenty strong to not require a spar it is mainly use as a method to connect the wing to the fuselage.
3D printing settings
The KEY reason I am recommending this as a first build is how easy this plane is to print. This build uses one set of settings for the majority of the parts and only one other set of settings for the rest of the parts.
Profile #1: LW-PLA
Layer Height - .2
Line Width - .42
Wall Line Count - 1
Print Thin Walls - Checked
Minimum Feature Size - 0.001
Top Layers - 0
Bottom Layers - 0
Infill Density - 0%
Printing Temperature - 235c (LW-PLA)
Build Plate Temperature - 60c
Flow - 55% (LW-PLA)
Print Speed - 55mm/s
Enable Print Cooling - Checked
Fan Speed - 50%
Generate Support - Unchecked
Spiralize Outer Contour - Checked
Profile #1 Parts List:
Fuselage
Cover 1, Cover 2, F1, F2, F3, F4, F5, F6, F7, Left & Right Elevator, Left & Right Horizontal Stabilizer
Wing
Flaps, Left & Right Ailerons, Left & Right Wing 1, Left & Right Wing 2, Left & Right Wing 3
Profile #2: PLA
Layer Height - .2
Line Width - .42
Wall Line Count - 3
Print Thin Walls - Checked
Minimum Feature Size - 0.001
Top Layers - 6
Bottom Layers - 4
Infill Density - 10%
Infill Pattern - Gyroid
Printing Temperature - 215c (PLA)
Build Plate Temperature - 60c
Flow - 102% (PLA)
Print Speed - 55mm/s
Enable Print Cooling - Checked
Fan Speed - 50%
Generate Support - Unchecked
Spiralize Outer Contour - Unchecked
Profile #2 Parts List:
Fuselage
Battery Latch, Elevator Control Horn
Wing
Wing Servo Conector, 8mm Spar
Landing Gear
Left &Right Main Strut, Nose Strut, Main Rim x6, Main Tire x4, Nose Tire x2
Stencils