ES 1.1m Sport plane

1m size sport plane. Light and fun to fly.
Modeled loosely referencing old EasyStreet kit 3 view , airfoil and structure is defined independently.
This plane is built as a one piece, non removable wing without landing gear.
Printed with LW PLA except motor mount. Need to slice with Cura. I built 3 so far, adding necessary reinforcement as it broke. A pair of 1.5-2mm carbon rods at the center of the wing makes it strong while light. It can sustain abrupt maneuvers like snap rolls.
Changed airfoil from NACA0012 to thinner NACA0010 for sharper snap entry. This plane is not good at post stall thus not suited for slow 3D flying.
Recommend a strong motor. With my current config, I can accelerate fast in vertical climb, can do a knife edge loop.
This is a belly lander without gear. Be careful to slow down well at landing to avoid prop strike. APC prop is easy to break, or use folding prop.
Parts are cut for large sized printers. You need to cut them to print.
Spec
- Span 1,120mm
- Length 904mm
- Wing area 22.1dm2
- Flying weight ~800g with 1500mAh 3S
- CG at 100mm from LE at the root
Build manual is posted on RCGroups here
Recommended setup and required hardware
● Motor around 80 -110g weight back mount type
○ Examples are SunnySky X2814 1250KV, Turnigy SK3 3536 1200kv etc
○ For relaxing sport flying without strong vertical acceleration, you can pick up a long can type of 22 class motor such as 2216.
○ Consider a prop APC E 8x6 or 9x6 for sport flyer characteristics, avoid large dia prop. Easier to break at landing.
- 9g servo x 4. (for example EMAX ES08A. Pick a better one than the cheapest Tower Pro 9g. It has too much back slush and cannot fly accurately)
- 40A or larger matching ESC
- Matching prop.
- 1000 - 2200mAh 3S battery. (I fly with 1500mAh 3S, enough for 2 Sportsman patterns)
- 5ch or more receiver
- 2 x 30cm 1.5 - 2.0 mm carbon rods
- 2 x 1 - 1.5mm steel rod (piano wire) for elevator, rudder linkage
- 2 x aileron linkage
- 6 x 2mm tapping screws for the motor mount.
- Wood toothpicks (common 2.2mm dia) for moving surfaces axises.
- Medium density CA and CA Kicker
- Slow curing epoxy (15-30 minutes) for ‘wing spar’ carbon rod
- Silicone glue (to fix servos, soft rubber type which can be removed later)

Flight videos at
LW PLA sport plane https://youtu.be/ZFfU6Ukrr08
3D Printed ES sport plane Insta360 Go ride https://youtu.be/2mhqjYEr3_k

Print with LW PLA. Uses Eclipson style profile + Cura surface mode.
Large bed size printer is recommended. Some parts exceeds 250mm height.
See enclosed build manual for detail.