True 2s Brushless Whoop

By RawFPV on Sep 30, 2017

50  9,474  48

Whoop There It IsWhoop There It Is

Here ya go! A true brushless whoop, true to the original size (give or take 1mm). Let me tell ya, it looks like a whoop, is the size of a whoop, but flies like 5", power loops and all. You know, it really annoyed me when I would see someone post, brushless "whoop" and then you look to only find its way bigger, or the prop size is massive, or it's a f** 3" build. So when i found that they finally made a true whoop sized frame that looks like a whoop as well, but that can handle brushless, well, it was a magical moment. The fact it can handle 2s was the extra bonus that gave me a chub. LOL.

The Frame

I used the newish Rakonheli 66mm brushless whoop frame with the 2s option. they have a 1s version but you know, more power = more fun. There are a few things I picked up being unsure how the 2s would work on such a small prop, and a crazy high kv motor, so i did pick up the 1s holder. But now i have seen what that holder looks like, I could of easily made and printed my own. So if you own a 3D printer, you can print most of the accesory parts they sell, they come printed anyways.

The Motors Thas small... thats what she said!

I happen to grab the motors on a crazy banggood sale for about 3 bucks a pop, actually the whole thing, not including the frame cost me only about 35 bucks, thanks to the anniversary sale. But I have to say, these motors are worth the full price. For how small they are, they rock. They kinda look like a micro version of the hypetrain motors, if they were blued like a motorcycle's headers. LOL.
You do however need to make sure you are really good at soldering and have a super fine tip. this is an advance build believe it or not. you need very good hand control to get everything built. this thing has the smallest screws ever. They like to fall, and bounce right out of your life never to be seen again. Luckily the kit has plenty of spares. The best part of this build is that i have full osd, rssi, and I can crank the signal up to 200mw for long distance flights(long distance for a whoop).






Photos

Part List

Frame

Rakonheli 2S Delrin Carbon 66mm Brushless Whoop Kit (for 0603, 0703 Motor) (4 builds)
Rakonheli.com
$28.99

Flight Controller

Super_S F4 2S Flight Controller Built-in Betaflight OSD+Super_S BS06D 4in1 Blheli_S 6A ESC for RC Drone (23 builds)
Banggood.com
$32.24

Motors

4 x Racerstar 0703 BR0703 SE 12000KV 15000KV 1-2S FPV Racing Brushless Motor (2 builds)
Banggood.com
$39.96

Propellers

Rakonheli 31mm 3 Blade Transparent Propeller (2CW+2CCW; 1.0mm Shaft) (6 builds)
Rakonheli.com
$4.99

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

Banggood.com (37 builds)
Banggood.com
See Site

Receiver

FrSky Ultralight XM Receiver Up To 16CH for RC Drone FPV Racing (71 builds)
Banggood.com
$11.99

Radio

RadioMaster Boxer MAX RC Transmitter w/ AG01 Hall Gimbals ELRS - Choose Color (3 builds)
Pyrodrone.com
$259.99

Goggles

Fat Shark Dominator HD Goggles
Rotorriot.com
$380.00

HD Camera

GoPro HERO5 Session (303 builds)
Getfpv.com
$199.99

Misc Parts

Vwclogan 3D printed Tiny Whoop Mullet Mode Canopy by Guerrilladrone
Thingiverse.com
See Site

Misc Parts

Vwclogan 3D printed Another Mullet Mod Camera Mount for Tiny Whoop by Quick_Quads
Thingiverse.com
See Site

Radio Module

Bandit Micro ExpressLRS 915MHz RF Module
Radiomasterrc.com
See Site

Battery Charger

ISDT K2 Air 200/500W 20A 2-6S AC/DC Dual Channel Smart ChargerDefault Title (3 builds)
Racedayquads.com
$149.99

Soldering Iron

Weller WLC100 Soldering Station - 5-40W for Hobbyists, DIYers
Electromaker.io
See Site

Backpack

REI Trail 25 Hiking Backpack *like new*
Poshmark.com
$60.00
Show stores (10)

Discussion

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BrownFox3   Sep 04, 2018  

So... i have fried 3 of these ESC's now... the last one was working wonderfully then boom, plugged in fresh bats and all the magic left...

Rice_Bowl   Sep 17, 2018 

well i usually check all contacts first before i connect a battery (also if there is carbon dust landing on your boards then yeah that will short)

BrownFox3   Sep 22, 2018 

so I got it all working! except it is very unstable and my rx seems to disconnect constantly... :P I will figure this out

Rice_Bowl   Sep 23, 2018 

maybe some manufacturing issue?

BrownFox3   Jul 10, 2018  
1

Alrighty, Im realy itching to build a 2s whoop like this! but i have noticed a lot of parts you have listed are unavailable or the links dont work. I am super new to this hobbie still and dont trust myself enough to fully pick compatable parts. Do you happen to have any other recomendations? I will post a list of what i have soon and if anyone can let me know if it will work or not that would be amazing!

Show 3 more comments
BrownFox3   Aug 18, 2018 

I was wondering if you could help me out with an issue i am having. I just got my litte guy all built and put together, dang are those motor wires small, and i have everything all hooked up in betaflight, and i can not get esc response. Motors will not move.... and im so new to this i have no idea what to do. any suggestions would be very apriciated!

T3RR1BL3 1   Aug 25, 2018 

have you set up an arm switch in betaflight? nothing will move until you have. if this is something you havent done search setting up an arm switch on youtube.

BrownFox3   Aug 30, 2018 

I totally forgot i had this comment on here. i got it all arming and working (it just kinda started working, it was weird) but i have a motor that still wont spin up. I have put on a new motor, tried a new esc, flight controller. im just really lost...

flowwithchaos   May 11, 2018  

Awesome build! I'm switching over my 1s brushless https://rotorbuilds.com/build/10292 to 2s with the 0703 SunnySkys and was wondering if you had an issues with tuning. On 2s its shaking extremely violently to the point is unflyable. Any suggestions? I tried changing gyro_lowpass and dterm_lowpass no luck. Dropping d term doesnt help either.

RawFPV   May 11, 2018 

Mine tune worked out nice fully stock, only thing I changed was my rates, but that wont help your isseue. I know I've seen peeps have issues going to 2's with the cam mounted to the front and not having somthing to balance it. make sure your quad isnt over working to compasate for having a heavy nose.

flowwithchaos   May 11, 2018 

Thanks for the suggestion, Ill try resetting my tune, remove the camera and see if I can get it flying fos at least. Makes sense with these small builds, more power would make it more sensitive to the CoM.

STOLerant   Feb 25, 2018  

Debating on doing this build but looking at datasheets, I have become conflicted on 0603 or 0703. What are your flight times and how is motor heat after a hard flight?

RawFPV   May 11, 2018 
1

im getting 3-4 min, with mild warmth on themotors during the summer.

hoddem   Jan 09, 2018  

Hey just checking in to see if you have had any problems with this build. I also posted on your youtube video, but i seem to be hitting the limit of the 5v supply using the exact parts listed above and having brown outs with any amount of throttle punch. I measured about 300mah for all the equipment not including the FC, it should have enough as it is rated at 500mah. flying LOS with the vtx turned off is no problem. thanks

RawFPV   Jan 31, 2018 

dang, no im not having any kind of issues like that.

brybell   Dec 11, 2017  

So, I got it built and plugged in the batteries...andddd smoke. :( I don't know what I did wrong.

Show 6 more comments
brybell   Dec 13, 2017 

Could you possibly take a look at these pictures and see if they could be the culprit of the issue. https://imgur.com/a/PYjmC

The green I drew on the RX is where the solder was on the antenna, and there was continuity between the antenna and that component. In the other picture you can see it does not look like the antenna wire should touch any components.

The other picture is of the FC, and where the negative wire from the ESC is supposed to connect. there is continuity between that and the component next to it which is circled in red. Not sure if this is normal or not.

ultraguardrail   Dec 30, 2017 

Carbon is conductive so if your soldered wires are touching the frame it would cause a short. I would resolder the motor wires and try to keep the exposed section of the wires much shorter.

hoddem   Jan 09, 2018 

check the cable that connects the esc and the flight controller, more than likely you killed the ground wire between the two. I did the same thing because the screws that mount the flight controller and esc were touching at the tips. the esc has the mounting pads connected to battery positive and the flight controller has the mounting pads connected to ground. i had to trim the screws down a bit and make sure the ESC was isolated from the FC before powering up the second time.

Hypurr   Jan 02, 2018  

Nice! I hope the dog hasn't eaten it by now. It was funny watching him chase it.
Just getting the parts in to build something similar, same FC but comes in a stack with the ESC and a cable connector. I went with the RH frame with the aluminum blade protectors. Can't wait to get in the air with this thing. Getting tired of brushed motors.

RawFPV   Jan 02, 2018 

She loves it so much, we have been flying inside since its only 14f out right now. I need to throw another video together. That flight stack is great, just be sure to shorten the screws that come with the frame so they dont touch and short everything out. update me when you have your build posted on here. id love to see it.

brybell   Dec 08, 2017  
1

Hey! I was curious if you soldered the motors to the ESC when they were mounted on the frame? Or loose....It's so damn small I am trying to figure out the best way.

RawFPV   Dec 08, 2017 

I did it with the esc already mounted.

brybell   Dec 08, 2017 
1

Cool, thanks! I am assuming the motors were also mounted?

RawFPV   Dec 08, 2017 

Yeah that way you know the right length for the wires

brybell   Nov 25, 2017  

Hey! So i got the FC and ESC from rakonheli, but it came with no wires or cables to connect the two. What can I order to do that?

brybell   Nov 20, 2017  
1

Did you make the series connector yourself?

RawFPV   Nov 20, 2017 
1

Yup. Super easy.

brybell   Nov 20, 2017 

Sweet. Did you just buy 2 JST 2.0 connectors like this https://www.tinywhoop.com/products/upgraded-battery-pigtail-powerwhoop-connector

and mod them yourself?

RawFPV   Nov 20, 2017 
1

I actually bought two sets of crazy pony hv lipos with the ph2.0 connectors and each set came with one.

Xudus   Nov 03, 2017  
1

TAKE MY MONEY!

iamspankyFPV   Oct 11, 2017  
1

I noticed that you have 2x lipo batteries connected. Could you show us better how you made that connection. i get the power and the ground but the wire that goes between both batteries, it seems like it's going from ground to positive? could you please clarify? Also have you flown a betafpv 75mm? if you have how does this brushless fly compared to that? I watched your video but didn't see you do any flips, dives, or s turns so im just asking

RawFPV   Oct 12, 2017 
2s Setup

It goes from the power to the ground if the next battery to put them in series. That's how your lipos are wired internally to give you 2s, The s in 2s stands for series. ;)
Also the vi do a few flips in the video and a split S. I would of had more but my lines leading up to them wernt that great. I'll shoot some LOS video to show the flips and rolls. It's on point. When you do a flip and rolls there is almost no recovery. As compared to a 75m I would say its better, It's a lot lighter, you get longer flight times, and its identical to a real whoop in all dimensions give or take 0.5mm

RawFPV   Oct 12, 2017 

damn that was not supposed to post that big. i have the image up in the photos with a drawing on the wires to explain the layout

fpv-slow-poke   Oct 06, 2017  

This is exactly what I was looking for! How well have the 0703 motors been holding up?

RawFPV   Oct 06, 2017 

Really well! I've had a few crashes and actually broken some props, but these motors keep on rocking. I've already put about 4 hours on theses things, and with the old brushed whoops, you start to feel the motors go. I love not having to worry about replacing motors every 4-7 hours of flight time.

thumbtwiddler   Oct 03, 2017  

Y E S

at165db   Oct 02, 2017  

That looks like a blast! What is the dry weight with canopy?

RawFPV   Oct 02, 2017 

Thanks, I'll have to measure that when I get home.

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