Freestyle Geprc Leopard

By hnes on Dec 08, 2019

10  241  5

I decided to build a top-of-the-line Freestyler. It should be durable, have a build-in HD camera and decent Video and RC Range.

I have chosen the following components:

  • GEPRC Leopard Frame - It looks durable and good. Only con: little space. So i checked part placement in CAD first, I found a way to pack everything in there.
  • T-Motor F40 Pro III 2400KV - these are very powerful. I use them already on another Quad and I like them, so i used these again.
  • Matek F722 Flightcontroller - I like Matek FCs, you can invert all the UARTs and they have a lot of them. I have choosen this one because I want to test the F7 CPU. Moreover this FC allows to connect 2 cams and switch between them via TX - perhaps I can make use of this feature in the future.
  • HGLRC T-Rex 60AMP ESCs - Very cheap BL_Heli 32 ESCs that can deliver a lot of Power and provide a telemetry pad
  • Caddx Tarsier Camera - Split cams always add little latency, so i decided to test a 2-Lens Camera in this build
  • Eachine TX805S VTX - best power/Money+Size-ratio. Also supports Pitmode and Smartaudio - that's all I need.
  • FrSky R9mm Receiver - Tons of range and very little price difference to a 2.4G RX. Supports telemetry also, so same here: All i need.

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Dealing with limited space

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As space is limited in this frame I decided to figure out how to place the components in CAD. I found a way to fit everything in there: The FC at the bottom with the Caddx Tarsier board on top. I've placed the Receiver in the front of the baseplate and the buzzer at the rear. The VTX fits exactly in between the two aluminum braces, so I decided to mount it with zipties in between them - It sould be protected quite good there.

Mounting the Baseplate and cage

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Mounting the Baseplate is quite straight forward. I have mounted the baseplate first an decided to use longer screws to mount the FC and the Caddx Tarsier board on them. If you also plan to do so please do not forget to use vibration damping inserts for your flightcontroller as softmounting is mandatory nowadays. Mounting the cage was also straight forward, I screwed everything together and removed one sideplate and one aluminum brace to keep everything accessable. I had do print an adapter for the Camera as the frame is designed for standart-size cameras, you can find it here. After that I was able to mount the cam an confirm that there is enough space.

Wiring everything up

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I like to solder outside the frame if possible. With this frame that worked quite well for most of the components: I started with soldering ESCs and motors to the FC and continued with all the cables with plugs. After that only the Receiver and the VTX were left. I wired the receiver directly to the FC via F.Port, I also wired SBUS for firmware updates. If you want to do Firmwareupdates via serial passthrough please take care to wire the receiver to a 5V pin (only powered with battery), not to a 4V5 pad (powered by USB only). If you have never heard about firmwareupdate via serialpassthrough check this out. The last thing to connect is the VTX, make sure that the cables are not to short before soldering it to the FC.

Power cable

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I do not like to direct wire the XT60 connector to the FC as it may damage the FC or get ripped off in a hard impact. Therefore i wire short silicon wires to the FC and the connector on the end of these. To make it look nicer you can also put a shrink tube around the two wires. When soldering the power wires do not forget to solder a CAP for voltage smoothing to the power pads.

Mounting all together

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When all the soldering is done it is time to mount everything together. I started with mounting the FC, motors and ESCs to the Baseplate. After that I mounted the receiver with a zip tie directly on the Baseplate. After that it becomes a litte more tricky: You have to place the cage near the rest of the frame and install the Tarsier board on top of the FC, after that you are ready to mount the cage on top of the baseplate. After checking that everything is placed where you want it to have it is time to close the cage by mounting the second aluminum brace and second sideplate.

Betaflight configuration

Betaflight configuration is as always, but in this build are some things to keep in mind:

  • I had to remap the resources for the motor pins as I mounted the FC 180° rotated
  • I had to configure Gyro orientation for the same reason

You can find a full dump here

First Flights

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It was quite easy to find a good PID tune and the Quad is very powerful and flies as expected. In the FPV feed I have props in view in the bottom left and right corner, you could avoid this by mounting the Camera a little higher. in the 4K feed there are no props in view.

Photos

Part List

Frame

GEPRC GEP LX Leopard Gold Edition LX4 LX5 LX6 195mm 220mm 255mm FPV Racing Frame 4mm Arm (34 builds)
Banggood.com
$53.18

Flight Controller

Matek System F722-SE F7 Dual Gryo Flight Controller w/ OSD BEC Current Sensor Black Box for RC Drone (3 builds)
Banggood.com
$44.99

ESCs

4 x HGLRC T-Rex 60AMP 60A BLHeli_32 3-6S ESC Dshot1200 For RC Drone FPV Racing Multi Rotor
Banggood.com
$44.84

Motors

4 x T-motor F40 Pro III 2400KV 2600KV 3-4S CW Thread Brushless Motor for RC Drone FPV Racing (8 builds)
Banggood.com
$107.60

Propellers

2 Pair DALPROP T5045C Cyclone 5 Inch 3 Blade Propeller Clover Prop Black Red Orange Green (182 builds)
Banggood.com
$3.18

FPV Camera

Caddx Tarsier 4K 30fps 1200TVL Dual Lens Super WDR WiFi Mini FPV Camera HD Recording DVR Dual Audio OSD for RC Racing Drone (28 builds)
Banggood.com
$79.99

FPV Transmitter

Eachine TX805S 5.8GHz 40CH 25/500/1000/1600mW AV FPV Transmitter VTX LED Display With Mic Heatsink Support OSD/Pitmode/Smart Aud
Banggood.com
$21.99

Antenna

2PCS MXK 5.8 GHz Pagoda-2 Omni Directional FPV Antenna LHCP/RHCP SMA Male 95mm
Banggood.com
$14.10

Receiver

Frsky R9 MM 4/16CH ACCESS 900MHz Long Range Telemetry Receiver with an Inverted S.Port Output (4 builds)
Banggood.com
$24.99

Radio

FrSky 2.4G 16CH Taranis X9D Plus SE Transmitter SPECIAL EDITION w/ M9 Sensor Water Transfer Case (4 builds)
Banggood.com
$264.00

Goggles

Eachine EV200D 1280*720 5.8G 72CH True Diversity FPV Goggles HD Port in 2D/3D Built-in DVR (16 builds)
Banggood.com
$268.90

Misc Parts

4 PCS Realacc M3*7+4.5 Flight Controller Anti-Vibration Fixed Screws for RC Drone FPV Racing (50 builds)
Banggood.com
$3.82

Misc Parts

SASTFOE Green Edition 128GB U3 Class 10 TF Micro Memory Card for Digital Camera MP3 TV Box Smartphone
Banggood.com
$15.99

Radio Module

FrSky R9M 2019 900MHz Long Range Transmitter Module and R9 Mini Receiver with Mounted Super 8 and T antenna (2 builds)
Banggood.com
$59.59
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Discussion

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00jferna   Dec 09, 2019  

Gorgeous build! So, no props in view?

hnes   Dec 09, 2019 

Only in fpv feed. No Props in 4k video. I don't mind, if i did I would mount the cam a little higher.

HK-AERIAL VTOL   Dec 09, 2019  
1

Yep.... not a lot of room, but also, as you stated: STRONG frame. I love my LX5 (my first 5"), and still fly it at least a few times a week. Nice selection. :)

joshielevy   Dec 08, 2019  

Post some video! I'd love to see the camera quality.

hnes   Dec 08, 2019 
1

I don't have an uncompressed video at the moment, all i can provide is this: https://www.instagram.com/p/B5frY7FlRek/?utm_source=ig_web_button_share_sheet

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