Sunday, March 19, 2023

Paramotor parts (motor, servo, esc, ...)

MOTOR
For this project I have chosen a Turnigy Aerodrike SK3 3542 1185kv motor. In combination with a 3 cell lipo and an Opale 10 inch carbon prop I should get enough power for normal flights. With Ecalc and Drivecalc I calculated that with a 10x7 triblade prop I will operate at the max conditions for this motor and have enough power for acro flights. I'm going for a 3 cell setup because I already have some 3cell 3000mAh lipo. And these should fit nicely in to the battery bay of the Opale XS3 backpack.

ESC
To power the motor I bought the YEP 60A ESC. Nothing special to tell. It just fits the specs. The BEC of this ESC is used to power the mixer and RX.

BEC
As mentioned the BEC of the YEP 60A esc will power the mixer and RX and has a voltage output of 5.5V. To power the servos i choosed to use a secondary BEC. The Turnigy 8A-15A UBEC has a 6V output. This matches the specs of my servos.

SERVO
It took me some time to find a good servo for this project. I wanted a servo with good specs, high torque, high speed, but I did not want to pay the premium price. So I ended up with the Strakstar 621MG. It has good specs (on paper) and is not to expensive. But when this product was delivered I was not happy with the quality. I bought 3 sevo's. One was OK, One had some nasty jitter and the last one didn't work at al. But after an RMA request with the reseller I got a new one that works fine. The Strakstar 621MG also fits perfectly in to the Opale XS3 backpack. This servo has a 180 degrees swing range for a pwm signal from 500ms to 2500ms.
The Opale XS3 backpack can be equiped with an extra set of servos to operate the speedbar. As my wing (Cefics Edmund Race 1.5) has this feature I needed this extra set of servos. It was hard to find a servo that had the correct dimensions and specifications. But this is the one I found: Corona DS238MG Digital

RX & Mixer
I'm having a 6 channel TX system. For this paramotor I bought a OrangeRx R617XL cPPM receiver that is really cheap. Currently It's on sale for less than 4$. My TX system does not allow to program or mix channels in a way that I can use it to control a RC paramotor. So I need a mixer. At this moment the only rc paramotor channel mixer that is available is the RC-PARA mixer from Hacker. But this product is overpriced. They sell it a 40$ while the (mass) production cost will be less than a 1$. And keep in mind if you have an extra set of servo's to operate the speedbar you need 2 mixers. The R617XL receiver only has a cppm output witch is not compatible with the Hacker RC-PARA mixer. Solution for all this, I bought a 9$ Arduino nano and programmed it myself. I now have my own DIY CPPM compatible paramotor channel mixer that can operate the brake lines/servos and speedbar lines/servos all-in-one. But more about this in a later topic.

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