Purple Pickle

By DrMacca on Apr 10, 2020

7  167  3

My daughter (10 going on 25) clearly has me figured out now; "Wait, you're building another one? Do you like building them more than flying them?"

She's probably right. :)

Supposedly, at some point in the future we're going to start to experience Spring here in the Northern Hemisphere. With that in mind, I'm slowly starting to inch up (pun intended) to slightly bigger builds with the idea of one day possibly moving up to a 5 inch quad like a big boy. This is the first 4S quad I've built and flown and well...it's going to be hard going back to smaller quads!

This guy is a ton of fun to fly - lots of power, really responsive and bloody fast (compared to what I'm used to).

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The frame is actually a 4 inch frame but I'm using 3 inch props because I already have a bunch lying around and I found it tricky to find 4 inch T-mount tri-blade props (you can get 4" HQ biblade props but I tend to prefer the 'grip' of triblade propellers). Speaking of the frame, I really like this particular design from RVS - it's light but the 3mm thickness gives me confidence that it could handle a decent crash.

The frame supports the 26x26 whoop-style AIO boards or 16x16 nano stacks. I went with the former and used the GEPRC AIO which was easy to use and didn't give me any issues/problems. The board can support 20 amps continuously and a 30 amp burst, both of which are a bit overkill for these particular motors but it does afford me a bit of flexibility if I want to upgrade the motors and/or use the board in another build.

I used the FlyWoo 1404 3750kv motors and, along with looking pretty, they seem to be quite efficient. I'm getting almost 4 mins flight time with a 4S 650mAH lipo and that's with me flying like a maniac. You can get the same motors at 4850kv as well, I'd assume more power but shorter flight time with those.

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I used the Eachine TriangleD VTX which has an 'ok' DVR (it's slightly better quality than the Goggle DVR) and an Frsky XM+ receiver because it's cheap and easy. I like the Caddx Baby Ratel but, like I mentioned in another build, FPV cameras are so subjective so go with what you know you like.

I tried a variety of props but felt the Emax AVAN Mini 3X2.4X3 triblades felt the best for this particular build. I also really like the more angular shape.

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Without a lipo this guy comes in at 101g and 179g with a Tattu 4S 650mAh lipo. If you wanted to, you could drop that weight around 93g to by switching to the 3" version of the frame (save 5.5g) and swapping the VTX to something like the TBS Unify Pro Nano (saving 2.5g). However, I almost feel that the extra weight helps for freestyle; giving a greater sense of momentum when you 'fling' the quad than with lighter builds...or I'm just imagining that and talking out of my ass. It's a 50/50 chance on that one.

Overall, this is an easy, straightforward build and a lot of fun to fly.

Photos

Part List

Frame

RVS Picklefork4 - 4" TrueX Toothpick Frame
Rotorvillage.ca
$21.99

Flight Controller

GEPRC 20A AIO Flight Controller - 20A, 2-4S
Rotorvillage.ca
$71.99

Motors

4 x FlyWoo Nin 1404 - 3750/4850kv Motor
Rotorvillage.ca
$75.96

Propellers

6 Pairs Emax AVAN Mini 3 Inch 3X2.4X3 3-blade RC Drone FPV Racing Propeller CW CCW (65 builds)
Banggood.com
$6.74

FPV Camera

Caddx Baby Ratel Starlight Nano 1200TVL CMOS 4:3/16:9 PAL/NTSC FPV Camera (1.8mm) - Choose Color (25 builds)
Racedayquads.com
$30.99

FPV Transmitter

Happymodel Diamond 5.8Ghz 40CH 25/100/200mW Switchable VTX FPV Transmitter with DVR Smartaudio Ready 3.3-5.5V (19 builds)
Taco-rc.com
$14.99

Receiver

FrSky XM+ 2.4GHz Micro ReceiverDefault Title (1149 builds)
Racedayquads.com
$15.99

Batteries

Tattu R-Line 650mAh 14.8V 95C 4S1P Lipo Battery Pack with XT30 Plug (19 builds)
Pyrodrone.com
$15.99

Radio

FrSky Taranis QX7 ACCESS 2.4GHz RC Transmitter - Choose Your Color (263 builds)
Racedayquads.com
$129.99

Goggles

SKYZONE SKY02C 5.8Ghz 48CH Diversity FPV Goggles Support DVR HDMI With Head Tracker Fan For RC Racing Drone (22 builds)
Banggood.com
$265.99

Goggles

Store.dji.com (241 builds)
Store.dji.com
See Site

3D Printed

PicklePod2 TPU Whoop Toothpick Canopy (4 builds)
Rotorvillage.ca
$9.99

Misc Parts

Ummagawd UMMAGRIP Universal Super Sticky Battery Pad (175 builds)
Racedayquads.com
$4.99

Misc Parts

Voltage Capacitor - 220uF 35v (2 builds)
Rotorvillage.ca
$1.99

Battery Charger

iMAX B6 Digital RC Lipo NiMH Battery Balance Charger (2 builds)
Banggood.com
See Site

Soldering Iron

Welding Soldering Iron with Thermostatic Digital-Controlled and LCD Screen Display, 60 W Temperature Adjustable 180℃/356℉-48
Amazon.com
$26.99
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Discussion

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sergetania   Apr 10, 2020  
1

Hey, we don't want to admit we are not quite normal. However, it's rather obvious for everyone else. 🙄
How do you make the little plastic nuts that hold the canopy stay down?
Nice build! 👍

DrMacca   Apr 10, 2020 
1

:) So true!

I believe I got the plastic nuts from an M2 standoff set (something like this one - https://www.banggood.com/Suleve-M2NH4-M2-Nylon-Screw-Black-Hex-Screw-Nut-Nylon-PCB-Standoff-Assortment-Kit-300Pcs-p-1377786.html?rmmds=buy&cur_warehouse=CN) and I found them thicker than 'regular' plastic nuts and I haven't had any problems with them comming loose so far. Knock on wood!

The screw in the front of the TPU canopy is also really secure/tight which helps keeps things secure as well.

sergetania   Apr 11, 2020 
1

I lost all 4 plastic nuts on TP3 on its second or third battery pack. But TP3 comes with metal lock-nuts that are amazing and stayed on since then.

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