# Willow Sor build log

> E-Willow Sor F3F glider build by Ian Mason: electric conversion with no added lead, redundant BECs and FrSky receivers, 450 W SunnySky power, photos.

- URL: https://guillaumeplayground.net/willow-sor-build-log/
- Author: Guillaume (https://guillaumeplayground.net/about/)
- Published: 2020-03-30
- Updated: 2020-07-20
- Section: RC & builds
- Topics: f3f glider, f3x glider, rc, f3x, glider
- Source: Guillaume playground

Willow Sor… and more precisely an E-Willow Sor.

Straight forward build – nothing special except the electric conversion. The initial goal is reached: no lead added with the electric conversion so finally nearly no overweight compared to the non-electric model.

This outrunner give me 90watt/lb which is pretty good and more than enough.

-   redundant power setup: dual bec
-   redundant radio setup: frsky g-rx8 + frsky r9mini/r9m
-   450w powertrain with Sunnysky x2220-iii 980kv
-   3s 2200mah
-   CG: 106 without any lead – just battery

![The beast](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200315_160521_5.jpg)
*The beast*

![Servo horn to max height for aileron and flap](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200314_115529_4.jpg)
*Servo horn to max height for aileron and flap*

![Wing servos frame and bearing ready](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200314_145412_9.jpg)
*Wing servos frame and bearing ready*

![Wing servos frame during slow expoxy cure](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200314_172015_5.jpg)
*Wing servos frame during slow expoxy cure*

![3mm rod and ball link with 2mm hole. 5mm of the rod is reduced to 2.5mm and the ball hole is extended to 2.5mm. The ball is heavily heated before insertion and the rod is enforced with a hammer. The result is sanded.](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200314_190202_4.jpg)
*3mm rod and ball link with 2mm hole. 5mm of the rod is reduced to 2.5mm and the ball hole is extended to 2.5mm. The ball is heavily heated before insertion and the rod is enforced with a hammer. The result is sanded.*

![3mm tail brackets before trim](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200314_194745_6.jpg)
*3mm tail brackets before trim*

![3mm tail brackets ready for surface insertion](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200314_195450_9.jpg)
*3mm tail brackets ready for surface insertion*

![3mm bracket](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200314_212724_7.jpg)
*3mm bracket*

![Tail final](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200315_155703_0.jpg)
*Tail final*

![Fixed tail rods](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200611_081534_5.jpg)
*Fixed tail rods*

![Fixed tail rods perfectly planar surface with epoxy settled under the klapton tape](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200611_081558_9.jpg)
*Fixed tail rods perfectly planar surface with epoxy settled under the klapton tape*

![... the frightening nose cut](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200611_081621_3.jpg)
*... the frightening nose cut*

![Nose circular reshaped with motor mount](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200611_081655_2.jpg)
*Nose circular reshaped with motor mount*

![Nose reinforced stiffness with 200gr UD carbon](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200611_081648_5.jpg)
*Nose reinforced stiffness with 200gr UD carbon*

![Epoxy microballoons added on this side](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200611_081723_0.jpg)
*Epoxy microballoons added on this side*

![Reinforced fuselage with UD carbon, Fiberglass servo plate. Tail servos in place](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200627_182308_7.jpg)
*Reinforced fuselage with UD carbon, Fiberglass servo plate. Tail servos in place*

![g-rx8 a2 input battery telemetry](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200704_105111_6.jpg)
*g-rx8 a2 input battery telemetry*

![g-rx8 a2 input battery telemetry](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200704_105234_2.jpg)
*g-rx8 a2 input battery telemetry*

![complete redundant electrical circuit - schottky diodes - 7.2V ubec with esc/bec failover - 3a battery telemetry](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200704_111953_6.jpg)
*complete redundant electrical circuit - schottky diodes - 7.2V ubec with esc/bec failover - 3a battery telemetry*

![complete redundant electrical circuit - schottky diodes - 7.2V ubec with esc/bec failover - 3a battery telemetry](https://guillaumeplayground.net/wp-content/gallery/willow-sor/IMG_20200704_112538_9.jpg)
*complete redundant electrical circuit - schottky diodes - 7.2V ubec with esc/bec failover - 3a battery telemetry*

This outrunner give me 90watt/lb which is pretty good and more than enough.

  
Thanks Ian Mason for this wonderful model ([http://willowracing.blogspot.com](http://willowracing.blogspot.com)) and Mister Zhou for the excellent manufacturing ([https://www.rgmcn.com](https://www.rgmcn.com))