1s Racer, Toothpick Class, 33g, 55mm props

By nitram509 on Jul 21, 2019

8  271  4

My first Toothpick class drone.

Goals: indoor flyable, using 1s Batteries, no HD, suitable for acro/freestyle flying.

Techspec

  • 0804 12000 KV motors
  • 100mm wheelspan
  • 33 g dry weight
  • 55m 2-blade props
  • Crazybee F4 pro v2 AIO FC and ESC and FrSky receiver

The frame is a 100mm carbon frame, 1.6mm thick, which is actually build for 8520 brushed motors. I used some two component epoxy to fill the wholes completely and drilled the required m2 wholes afterwards into the epoxy. This worked like a charm. Just some minor bumps are left on the bottom of the frame, as you can see in the images. To avoid the motors are mounted with a little slope/angle, I used sticky tape at one side of the frame to make a flat surface for the epoxy.

Photos

Part List

Frame

2PCS DIY Micro FPV RC Quadcopter 100MM Brushed Frame Kit Support 8520 Coreless Motor
Banggood.com
$12.95

Flight Controller

HappyModel Crazybee F4 Pro V2 Brushless Whoop Flight Controller for Mobula7 & Mobula7 HD - Choose Your RX (20 builds)
Racedayquads.com
$41.99

Motors

4 x iFlight Tachyon T0804 12000KV 15000KV 1-2S Brushless Motor for Indoor FPV Racing Drone
Banggood.com
$55.28

Propellers

2 Pairs 2627 Propeller Special Plastic CW/CCW For Micro-X Hubsan X4 LKTR120 RC Drone
Banggood.com
$1.92

FPV Camera

Caddx Firefly - Micro FPV Camera w/ VTX (9 builds)
Getfpv.com
$24.99

Batteries

2pcs GNB 450mAh 1S HV 3.8V LiPo Battery 80C JST-PH 2.0 PowerWhoop mCPX Connector for EMAX Tinyhawk Brushless Micro Racing Drone (4 builds)
Amazon.com
$12.99

Radio

FrSky 2.4G Accst Taranis Q X7 16 Channels Transmitter Remote Controller White Battery and Battery Trays Not Include (165 builds)
Amazon.com
$124.98

Goggles

Fatshark Dominator HD3 Core 3D FPV Goggles with HDMI DVR Support Head Tracker (48 builds)
Banggood.com
$399.00

Misc Parts

Camera Fixing Mount For Eachine QX70 E010 E010C E010S Blade Inductrix Tiny Whoop VM275T HC48 (2 builds)
Banggood.com
$2.43

Misc Parts

5 Pairs 100mm 10cm JST Male And Female Plug Connector Cable ESC Extension Cable
Banggood.com
$1.67

Battery Charger

ISDT Q6 Plus 300W 14A MINI Pocket Battery Balance Charger (52 builds)
Banggood.com
$59.99

Backpack

IPRee® 30L Outdoor Tactical Backpack 600D Nylon Waterproof Camouflage Trekking Rucksack
Banggood.com
$19.96
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Discussion

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LWP_Quad   23 days ago  

Nice job. That is a work of art. The ultralight stuff is just too cool.

Jodie Froster   Jul 21, 2019  
1

She looks super clean, and super lean!
How is the epoxy motor mount holding up?
How has that screw in the back done for you (as far as staying in, flight after flight)?
I applaud your material choices, so well thought out, and SO well exicuted.

nitram509   Jul 21, 2019 

Hi, thank you for the flowers.

The epoxy holds up super good. So far I just had wall and chair crashs at medium speed.
If you look closely, the screws and the motor bottom mount have ca. 1mm overlap with the carbon.
My thesis is, that the epoxy just holds 30% of the forces but the carbon the major 70% part (hint: thesis!).
In this line of thoughts, the epoxy does strengthen the carbon a bit and ensures the screwes don't move.

You had a very good catch of the screw in the back...
I have to admit it looks a little odd, but never moved a micron so far.
I did use titanium m2 screws (all screws), fixed with a nylon nut.
That feels rock solid and as said, never moved a micron so far.

Cheers.

Jodie Froster   Jul 22, 2019 

I keep running into situations in suuuuper light builds where stuff just "stays there" despite the g-forces and vibration of multirotor flight. They still suprise me.

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