This is an electric paraglider project I started in the spring 2016. The idea behind the project is not a traditional paramotor but a system designed as an alternative to towing. The equipment must be light, simple and used with common XC paragliding equipment. That's why I have chosen direct drive. Although a gear with a larger propeller would be more efficient. The only modifications made is some snap locks to latch the motor and batteries to the harness. So far, the project is a proof of concept. Eventually I will make a folding propellar system. I have already designed it. But more on that later.

Here are some concept drawings made before anything was built:

02 e-air

03 e-air

04 e-air

 01 e-air 05 e-air
     

2016-04-22:

Everything is designed in Autodesk Inventor. The back mount is built in plywood. The system to hook it on the harness is now ready for the motor and ESC. Connectors, wires etc. has arrived. Motor and ESC are in the mail.

a 01 a 02 a 03 a 04

2016-04-28:

Front Container for batteries made of a modified bicycle bag with room for 8 batteries. I also made a mobile power station to recharge the batteries. I have now ordered 3 more chargers so I can charge all 6 batteries at once. With approximately 20% capacity remaining, it will take about 2.5 hours to fully charge all batteries.

container01 battery01 battery02 powercase01

2016-05-26:

Motor and ESC finally arrived. Two hours in the workshop and everything was mounted.

comp-01 comp-02 comp-03 comp-04

2016-05-28:

Servo tester modification:
When using a motor and a speed controller we need some way to regulate the amount of throttle used. We are not planning to control the motor wirelessly so we are going to use a servo tester connected to some kinde of throttle. In my case a "Thumb throttle". If your ESC does not have UBEC you must connect a power source (eg. an SBEC unit).

  1. Disassemble the servo tester.
  2. Desolder the potentiometer (see fig. 2).
  3. Solder a jump wire across the 2 terminals of the servo tester (see fig. 3).

IMPORTANT
If you choose to fit a 3 pin JR plug to the throttle wire, then you MUST ensure that the modified servo tester is secured with electrical tape or similar so that it cannot accidently loose connection. This could result with the motor being activated continuously, hence the reason for a Power/Kill Switch.

st-01 st-02 st-03 st-04

2016-05-28:

The first test had to be terminated. Motor suspension is way too soft. At just half power everything feels dangerously wobbly. I have to figure out a solution or completely drop the 4 small rubber dampers.

test 01 test 02 test 03 test 04

2016-05-29:

Motor suspension redesigned. I have completely removed the small rubber mounts on the motor. I did see some small cracks in the wood spacer. There are many forces at play so I chose to saw it off and mounted 30x30 cm rubber suspension instead. I think i won a lot with these changes. The whole thing is much stiffer now and the konstuktionen is more simple. Finally I completed the first successful test (see video below).

test2 01 test2 02 test1-Youtube test2-youtube

2016-06-10:

The project is paused. This setup does not provide the required trust. I therefore set out to design a gear system so I can lower the RPM and increase the prop size. The goal is now to use a more traditional paramotor propeller. Unfortunately, it also means that the original concept has changed. Instead of designing an alternative to towing, this project is now a more traditional electric paramotor project.

Motor: 12090/S
KV: 80
Max: 18000W
Max amp:200A
Size: 120 x 90 ( without shaft )
Weight: 2.835 g.
Shaft: 12mm with 3mm keyway

ESC: 450A - HV-Sensored
Cell: 4-24S
Max volt: 70
weight: 875 g

       

6 x 8000mAh
22.2v
6S1P: 6 Cell
Discharge: 30C Constant (40C Burst)
Weight: 1220 g
Size: 165x69x52mm

 lipo 8000mah

Propeller 34x12

 
 
     

6 x Cell Checker
With Low Voltage Alarm
2S-8S

cell checker

AWG 8 silicon wire
AWG 6 silicon wire
EC 8 connectors
EC 5 connectors
8mm Gold Bullet connectors
5.5mm Gold Bullet connectors

 wires connectors
       

Servo tester

servo tester

Electric Thumb Throttle
Signal: 1-4v
3 wire (+-S)
wire lenght: 1000
total weight: 190g

 thumb throttle
       

Folding Propeller Adapter

folding adapter

Motormount drawing

motormount drawing