Flat Frog (1S, Brushless, 2", 1103, 26x26)

By crisat on Dec 26, 2018

6 337 4

Easy and quick build, using a "tiny whoop" style FC on a frame with 20x20mm mounting holes using1103 motors and 2 inch props.
With an adapter for a "whoop" style FC to any frame with 20x20mm mounting holes, which I designed. (Feel free to download its stl files from https://www.thingiverse.com/thing:3314449 for 3d printing.)
The adapter requires 2.5mm screws and can be used on frames with 2.5/3mm diameter mounting holes.
The canopy is just a piece of a shopping bag held in place by a 3d printed clasp (in the same stl file).
The battery is held in place with a 3d printed battery holder (in the same stl files).
The adapter incorporates a camera mount with 15 deg of inclination.
Moving the FC and fpv system into different frame and motors is very easy.
This is similar to my other build, the squashed frog which does not require a 3d printer.
This build opens up new ways to enjoy your frames or whoop FC. I hope you will like the simplicity of this idea as much as I do.

Cheers

Photos

Part List

Frame	Happymodel Toad90 90mm Micro 3K Carbon Fiber FPV Racing Frame Kit with CNC Aluminum Camera Mount for RC Drone (7 builds) Banggood.com	$13.44
Flight Controller	Racerstar Crazybee F3 Flight Controller UR65 4 IN 1 5A 1S Blheli_S ESC Compatible Frsky D8 Receiver (7 builds) Banggood.com	$35.10
Motors	4X Racerstar Racing Edition 1103 BR1103B 8000KV 1-3S Brushless Motor Black For 50 80 100 RC Drone FPV Racing (18 builds) Banggood.com	$45.98
Propellers	8 Pair DYS 2030 1.5mm Hole 2 Inch 3 Blade Propeller Triblade Bullnose Prop For 1102 1104 1105 Motor (18 builds) Banggood.com	$3.89
FPV Camera	Caddx Firefly - Micro FPV Camera w/ VTX (12 builds) Getfpv.com	$24.99
Misc Parts	adapter_20x20_frame_26x26_FC by crisat (2 builds) Thingiverse.com	See Site

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Discussion

nitram509 Jul 24, 2019

Hi, great ideas, how you build it.
You can save 2-4g if you replace all steel screws with titanium ones, shorten the motor wires, remove the motor connectors and direct solder the motors.
I know, it's fiddly work, but you could gain around 10% weight savings :)

Happy flying.

crisat Jul 25, 2019

Thanks. I agree. My screws are made of steel, quite heavy. Now, I am trying to find cheap titanium or alluminium screws and lighter 2inch popin propellers (2 or 3 bladed), so that I would also save the weight of 8 screws.

I would never have immagined that I would be happy to save 1g :)

DPJ Dec 27, 2018

Great work, how does it fly with the Bee FC?

crisat Dec 27, 2018

Thanks. It flies not bad: with a 7g 260mah battery (1S), it flies for 3 minutes and some seconds. It is stable and silent. It goes to failsafe more often than I expected, around corners of my house: maybe this carbon frame is too thick for this antenna. It want to try a thinner frame weighting less than 6g, but I struggle to find a cheap one.

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