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Pilot Baby - 3D Printable Vintage RC Sports Model Reproduction.

3D model description

Update - 04.06.2019:

I added an aileron wing. I haven't test printed it, but it fits in CAD and should print fine. Bend 2 mm piano wire to use as torque rods to the ailerons in the slot on the underside of the wing. The new files begin with "Aileronwing-" and should be printed light and single wall 0,25-0,3 mm extrusion like the other parts.

I used to fly a Pilot Baby decades ago. It was a fun little plane, even with heavy 540 car motor and 7-cell sub C nicads, and only elevator and rudder control. I decided to design a printable version using the original plan and keeping the original shape as close as possible. I even modeled the shape of the ribs and covering on top of the wing.

Flight videos:

When flying it's best to keep power on. It doesn't glide well and loses energy quickly in turns.

Wingspan: 914 mm.
Length: 683 mm (without prop and spinner).
Weight: 600-750 g.
CG: 46 mm from the leading edge.
Elevator throw: 6 mm up and 6 mm down.
Rudder throw: 12 mm each direction.
Power: 1400-3000kv motor and 4S-2S lipo with 6" prop.
Servos: 9g servos.

Here's the original plan:

I designed both rubber band wing attachment holes and a wing for latch attachment, which is easier but less forgiving og bad landings. Use a short length of 6 mm carbon tubing to join the wing halves. 4 mm rods or tubing can be used to help index the wing sections when gluing together.

It needs quite a lot of nose weight with the super light modern motor up there, so a heavy motor can be used (60g+).

I also made noses for different Cox TD and BB engines, but won't be able to test those out myself as I don't have any engines.

It has an integrated servo tray and holes for control rods to poke through, lining up straight to the control surfaces, which have integrated control horns.The printable clevis can be used on the end of 2 mm carbon rods to attach tot he tail. Use adjustable link clamps to secure the rods to the servos (

The fuselage parts have areas that should be cut away after printing. Fuselage 01 and 02 fit together with short bits of filament to index them as they are glued. Fuselage02 should have the top printed surface trimmed as well to clean up the stringing that occurs there, and Fuselage03 fits inside that end of Fuselage02. Fuselage04 fits inside the end of Fuselage03.

The two Hstab halves should be glued together with a short length of 2 mm rod to index and strengthen the joint. The tail surfaces are replaceable. The tail surfaces should be assembled by first inserting the Vstab into the fuselage and then slotting the Hstab in from behind and secured with tree M3 countersunk screws. Use CA hinges or your favourite micro hinges to hinge the control surfaces.

Landing gear can be bent from 2 mm piano wire or the 3D printable landing gear can be used.

It flies great as it's a close replica of the original design, which flew even with my old ultra heavy gear at around 1 kg weight. It even slope soared at that weight.

3D printing settings

General: Print at 0,25 to 0,3 mm extrusion width. Single perimeter and 0% infill for all parts unless specified otherwise below. Top and bottom layer count to fill inn as necessary. All PLA.

Part specific settings:
Clevis: Three perimeter, 4 bottom and 4 top layers.
Elevator01: Single perimeter, 2 bottom and 4 top layers.
Fuselage01: Single perimeter, 2 bottom and 6 top layers.
-0-80 mm: Single perimeter, 2 bottom and 0 top layers.
-80-154 mm: Single perimeter, 6 bottom and 6 top layers.
-154-top: Single perimeter, 0 bottom and 0 top layers.
Fuselage03: Single perimeter, 2 bottom and 0 top layers.
Fuselage04: Single perimeter, 2 bottom and 6 top layers.
Hstab01: Single perimeter, 2 bottom and 4 top layers.
Maingear: Three perimeter, 4 bottom and 4 top layers and 100% infill.
Motormount01-02: Print with several perimeters and solid infill.
Nose01-03: Print with several perimeters and solid or near solid infill as noseweight is needed.
Rudder01: Single perimeter, 2 bottom and 4 top layers.
Vstab01: Single perimeter, 2 bottom and 4 top layers.
Wheel01-02: Three perimeter, 4 bottom and 4 top layers.
Wheellock01: Three perimeter, 4 bottom and 4 top layers.
Window01-02: Three perimeter, 4 bottom and 4 top layers.
Wing01-03: Single perimeter, 2 bottom and 6 top layers.
Wing01-latch: Single perimeter, 6 bottom and 6 top layers.

  • 3D file format: STL



Designs 118
Downloads 21439

Norwegian inventor/designer/cat owner.



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Dear designer, I finished the plane but it can't fly. I pressed with the parameters you gave with PLA. After 3D assembly, the weight was 510gr. I used the engine you recommend engine = 52 grams, I used lipo 3s battery my battery = 170 gr. I put on 70 grams of Esc. The plane reached a total weight of 950 grams when 50 grams of lead weight was placed behind the engine to balance the center of gravity. When he was thrown by hand, he crashed 3 meters later. When you do a little research, Wing Cube Loading 17 comes out, so wing area = 91x16 = 14.56 dm2. Thrust value of this engine is max. 815 gr. It needs to fly very fast. Like a racer plane. I could not fly in accordance with the laws of physics. The thing I wonder is that when you get rid of the youtube video, it flies right away. Is there a trick in this? Can you tell me how? I struggled for 1 month and this is my conclusion. Please do not mislead people and provide correct information because it can cost people a long time or if you have other options, can you recommend it because I tried so hard.

Thank you so much. you really thought of the finest details. I printed the parts 3D printer did not cause any problems and I am in the process of joining. When I'm done, I will comment here. This is my first RC Model plane. I have no flying experience and my biggest concern is to damage the plane while landing. I got the engine you recommended.
When I mounted the engine on the nose of the plane, I noticed that you gave it a 3 degree right angle of inclination.

I have flown lots of flat bottom wings with ailerons. It's not a problem. The dihedral on the aileron wing is very low compared to the pure rudder wing. This plane comes from a time when rudder and elevator control was common. The aileron wing is optional and I added it because it was requested.

He designer, dont know how experienced you are. i know that from my early childhood that airfoils like Clark-y with a flat surface, dont work properly with ailerons. Instead of making the plan roll , the aileron produces only drag and is not moving the wing in the desired direction. The steering with rudder is 10 times more effektiv to make the turn. this depends also on the big dihedral angle. The original designer knew why they dont use ailerons.

Any airplane radio with at least three channels can control this.

Great model!! What RC controller do you need for this?

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