Quattuor 4 inch superlight with cobra motors dubbed Greenlight

By Quadlite on Jun 15, 2018

15  1,104  23

My second build, but 1st on rotorbuilds. Since taking the picture, I have added heatshrink to the vtx antenna so that its not touching the frame. Other than that, and a battery strap, this is pretty much the final product. This is my 130gram 4s, 4 inch quad. The battery listed is 700mah 75c 4s and weighs only 77 grams. With lipo strap and that 700mah 4s battery my auw is about 210grams. You could also use the 1050mah airblade and still be under 250 grams. The 1407 4100kv cobra motors provide just over 900grams of thrust each on 4s. Just as important though is that they miraculously do not get hot on 4s, and reach a high rpm, which can be just as important as thrust. They work GREAT with 4045x2 props, but they do not really benefit from triblade props. The idea behind this build is to use high rpm lightweight motors on a super light frame with lightweight props and nuts. It doesnt have the torque to use super aggresive props effectively or carry much weight, but that doesnt mean its not ridiculously fast! It flies VERY well. PS: The frame is also available as a stretched x if you prefer. Let me know what you think. Feel free to offer constructive criticism or suggest other electronics.

UPDATE: Switched out the xt60 for xt30. dry weight is now 124grams with 4045x2 or 126grams with 4043x3 props and he strap weighs 4 grams. AUW with 700mah 4s airblade lipo is 208grams!!!

Tags: superlight super light superlite super lite ultralight ultra light ultralite ultra lite 4inch 4 inch


Part List



Flight Controller

HGLRC 20x20mm Micro F4 Flight Controller AIO Betaflight OSD 5V BEC for XJB F425 F428 Series Flytower RC Drone (16 builds)


HGLRC 20x20mm 28A BLheli_S BB2 2-4S 4 In 1 ESC Support Dshot600 for XJB F428 F328 Series Flytower (8 builds)


4 PCS Cobra CP 1407 4100KV 2-4S Champion Series Brushless Motor Black for RC Drone FPV Racing (5 builds)


10 Pairs Kingkong / LDARC 4045 4x4.5 Inch PC Fiber Glass Propellers CW CCW for RC FPV Racing Drone (7 builds)

FPV Camera

Caddx Turbo Micro SDR1 FPV Camera (21 builds)

FPV Transmitter

HGLRC XJB-TX20 V2 Mini FPV Transmitter (16 builds)


FS-RX2A Pro V1 2.4G Compatible Receiver for FS-I6 FS-I6X FS-I6S FS-TM8 FS-TM10 FS-I10 Transmitter (13 builds)


AirBlade Premium 700mAh 4S 14.8V 75C XT30 by Bonka (5 builds)

Misc Parts

iFlight M3 Titanium Hex Allen Socket Button Head Screws Lot of 20pcs (M3 x 8mm) (6 builds)

Misc Parts

Aluminum Standoff - M3 Standoff Kit - M3AS5 10Pcs M3 25mm Knurled Standoff Aluminum Alloy Anodized Spacer - Green ( Aluminum Sta

Misc Parts

Deez Nuts (CW) - M5 Aluminum Low Profile Nylon Lock Nut - RED

Misc Parts

DIY Fixed Mount For Runcam Micro Swift FPV Camera Red & Black RC Drone FPV Racing Multi Rotor (9 builds)

Misc Parts

50 pcs/lot pure titanium bouton tête socket vis ti gr2 iso7380 m2 * 3/4/5/6/8/10/12/14/16
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newtrojan   Dec 11, 2019  

Could this be converted to a DJI Build.

Kruizen   Jun 26, 2018  

I also found 700mAh to be best for this weight range. I use this: http://pirofliprc.com/Pyro-Drone-Graphene-700mAh-4S-148V-75C-By-Who-Cares_p_4328.html and found it's equivalent to a good 850 pack regarding sag. You said you used 4" tri-blade props... which ones did you use? I've tried the HQ 4x4.3x3 V1S (at 2.2 grams) and found they work great and fly better then 4" bi-blades.

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Quadlite   Jul 07, 2018 

yeah, it seems like heavy 4 inch props arent great. but the 4043x3 are actually pretty good on these motors. ill probably try those luminiers too though. the thing about these cobra motors is that they are actually closer to 3900kv than their 4100kv rating, so they work surprisingly well on the 4043x3. my locknuts are like half the normal weight too which i think helps a little.

Kruizen   Jul 07, 2018 

How are the Airblade Bonka 700mAh 75C batteries doing for you on the 4043x3 at that KV? I've found Airblade's batteries to be pretty amazing - I'm just not so sure about longevity compared to graphene. I went with lower KV on tri-blades so I wouldn't have any sag...

Quadlite   Jul 07, 2018 

The airblade 4s 700mah are amazing. They have plenty of punch and last nearly as long as my GNB 850mah 4s, probably because its a full 35grams lighter and has similar mah. I never go full throttle longer than a couple of seconds, but I havent had issues with sag. I like the airblade 4s 1000mah too though because I can fly for a bit longer than all my other batteries.  My 1000mah 4s airblade weighs about the same as my GNB 850 4s. The GNB 850's I have vary between 110-112grams because they use 12gauge wire and an xt60. The 1000mah 4s airblade weighs 112grams assuming you got the one with the xt30 plug.  The version with the xt60 weighs 122grams, I have that one too. I lile that airblade has accurate weights on their website. The batteries I ordered from bonka weighed 10grams more than advertised. anyways! hope that helps!

volitant   Jun 25, 2018  

Awesome job getting it all to fit! Perfect dry and auw weights too, its not an easy build but really pays off in flight!

Quadlite   Jun 25, 2018 

Yeah its a tight fit for sure lol. it was originaly going to be a direct frame swap with my xjb 145 but i ended up upgrading most of it in the process. It did all fit, I just found better parts on sale locally and couldnt pass up 13$ cobra motors with free 2 day shipping. The camera is a great one too, 1200tvl and a gram lighter than the micro swift. It being lime green and matching the props was just icing on the cake lol.

volitant   Jun 27, 2018 

Thats a great price for those motors! The lime green really does look great too!

Indy   Jun 15, 2018  

Copycat? No, I tried everything, but I could never put smaller than 30mm standoffs and I have only 2 layer (ESC and FC with included VTX)...??? How the hell did you manage to put 3 layers??? I know you did explain it to me twice but I must be too dumb... I still need a picture from the side ;)

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Quadlite   Jun 15, 2018 

Another angle of the sl4r. note: I'm using a slightly larger reciever in this setup.

Indy   Jun 16, 2018 

nice built as well and well yes, the quattuor is definitely more "modern" made for mor recent components.

Indy   Jun 16, 2018 

i'm using xt30 and xt60 batteries on xt30 and xt60 builds with an adaptor and I don't notice any difference... 12awg is huuuuuge! I even don't use it for five inch props quads with 2207 2700kv... :)

Indy   Jun 15, 2018  

great built Quadlite! There is no reason this motors get hot in 4S with those 2 blades props and this light weight. I used as well heavy 4040 tri-blades props with heavier builds and I didn't experience any issues... even carrying a Runcam2. But as you said, there is no real advantage to do that.
Nice finition, I just wish you put more closups to see the details of the cool components you used.
Ultralight 4 inch racers are definitely the best! There is too few of them! They are not fragile because they are super light and thanks to those new 14xx they are really over reactive!!

Quadlite   Jun 15, 2018 

This build is my main focus, so im sure ill post more pics soon as i keep improving it!

Indy   Jun 15, 2018 


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