Lightweight 85mm 1S whoop conversion

By virtual_stephen on May 20, 2019

10 1,135 4

Started out as a 75mm whoop but now converted onto a 85mm carbon fiber frame with 55mm bi-blades and it flies like a totally different machine.

Wonderful control, snap and response. Flips, rolls and punch-outs that I didn't realise these motors would ever be capable of! The 85mm frame with 55m props is a nice size for 0703 motors which struggle to spin 65mm props.

Alt Tag

The new GNB 520Mah 1S HV lipos are great, highly recommended. I have flown on 300Mah but it's not quite as explosive. The canopy is a LDARC Tiny R version with a lot of dremel work done, both to allow the VTX antenna out as well as to allow a more aggressive camera angle. Original BetaFPV camera lost it's lens so that is now replaced with a similar tiny camera.

This thing is able to fly slaloms at "full tilt" literally punching its way from side to side to make incredibly rapid turns. So much fun.

31g dry weight
44g AUW including 1S 520Mah.

Part List

Frame	3DPOWER 85 fpv frame kit for Tiny whoop Frame Beta75x Mobula7 REX80 Shutterbug85 Toothpick (3 builds) Taco-rc.com	$13.99
Flight Controller	F4 1S Brushless Flight Controller ( Frsky RX ) (7 builds) Betafpv.com	$29.99
Motors	4 x Happymodel SE0703 19000KV 1S Brushless Motor for RC Drone FPV Racing Banggood.com	See Site
Propellers	Classic Hubsan 55mm Propeller x 4 Dronejunkie.co.uk	See Site
FPV Camera	600TVL 1/4 1.8mm CMOS FPV 170 Degree Wide Angle Lens Camera PAL/NTSC 3.7-5V for RC Drone FPV Racing (94 builds) Banggood.com	$7.37
FPV Transmitter	Z02 AIO Camera 5.8G VTX (Pin-Connected Version) (2 builds) Betafpv.com	$25.99
Batteries	GNB 1S LiPo 520mAh 3.8v PH2.0 80C 2Packs Longer Flying time Emax TinyHawk Amazon.com	$15.90
Hardware	4 Pieces LDARC TINY R Plastic Canopy Case for DIY RC Racing Drone KINGKONG TINY R7 Bwhoop INDUCTRIX Accessory Aliexpress.com	$3.38

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Discussion

Kubay_Danil Aug 13, 2020

Are the motors overheating? Is it possible to assemble such a device on 0802 motors and what KV is needed so that it can support 1-2S

virtual_stephen Aug 13, 2020

Motors do not overheat, but obviously it's not as powerful as a 11xx motor. These old hubsan 55mm props are light and easy to spin. If you wanted 1-2S then something like an 0803 in the 11000 - 12000kv range should be good with 55mm props. I have the "eachine trashcan" which is now also using 55mm props and that has more power than this when as the

gruss Oct 14, 2019

Love this! I am trying to do something similar..
I'm curious how you managed to get the 3-hole motors to work with the 4-hole mounts of the frame?

virtual_stephen Oct 15, 2019

used a dremel with a 0.5mm drill bit so create 3 new holes. It was a bit annoying as I had assumed the frame would fit as well, but it has a different 3-hole pattern instead of the one used of happymodel 0703. However the result is stable and strong (at least strong enough for such small motors).

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