X-Tube : 5" quad with tabular arms 145g

By IvanNik on Feb 23, 2019

16  838  10

The lightest 5'' quad with tabular arms

There are 3 main ideas:

  1. The lighter build (1407 motors, small battery) like described in https://rotorbuilds.com/build/7104, https://rotorbuilds.com/build/12496
  2. Use CarbonFiber 4x6mm tubes for arms (see https://www.rcgroups.com/forums/showthread.php?2645953-Mini-tubular-and-ultralight-LOS-Acro-FPV-Quads)
  3. Use successful/tested frame layout like Tooth Fairy: https://rotorbuilds.com/build/12179

Another goal - have baterry on top (I like well balanced quads)

There are 2 technics of attaching the plates and tubes: Carbon fiber tow (photos with hardware) and Kevlar cord (photos with the cat). I preferr kevlar - it's much easy to work and final vew is better.

Frame weight: 32g
Weight: 145g (212g with 650 mAh battery) !

Carbon cut was made by http://www.cncmadness.com/
See attached 2d DXF files in this post: https://www.rcgroups.com/forums/showpost.php?p=41249593&postcount=5606


Part List

Flight Controller

MAMBA F405 Mini Betaflight Flight Controller & F25 20A 3-4S DSHOT600 FPV Racing Brushless ESC (40 builds)


4 x Cobra CP 1407-3200KV Champion Series Motor (2 builds)


Gemfan 5x3 Nylon Glass Fiber Propeller (Set of 4 - Black)

FPV Camera

RunCam Micro Sparrow 2 (63 builds)

FPV Transmitter

Mini VTX5848 48CH 5.8G 25/100/200mW Switchable FPV RC Drone VTX Video Transmitter Module OSD Control (5 builds)


Lumenier Micro AXII Shorty U.FL 5.8GHz Antenna (RHCP) (7 builds)


FrSky R-XSR 2.4GHz 16CH ACCST Micro Receiver w/ S-Bus & CPPM (901 builds)


TATTU 650mAh 4S1P 75C 14.8V Lipo Battery Pack with XT30 plug (45 builds)

Misc Parts

10 Meter TORAY T700SC 12K Carbon Fiber tow continuous filament Yarn thread tape

Misc Parts

2pcs 3k Carbon Fiber Tube 5mm 6mm 7mm 8mm 9mm 10mm 11mm 12mm X 500mm Tubing AU

Misc Parts

Glue Masters (2 OZ Thin Viscosity) - Shoe & Wood Adhesive - General Home Repair Tool for Glass, Plastic, Rubber, Metal &

Misc Parts

Black Kevlar Cord Sewing Threads 380lb 500lb Heat Resistance Made with Kevlar

Misc Parts

5x M3 Aluminum Alloy 6061 Multi Color Knurled Standoff 10 15 20 25 30 35 40mm

Misc Parts

10PC M3 3Color Aluminum Alloy Hex Socket Cap Screw Bolt Button Round Head
Show stores (4)


Sign in to comment

matthew saigon   Feb 25, 2019  

can someone make the frame so i can buy ? i don't have resources to make it myself. i refer 4" 3 blade with 1407.

IvanNik   Feb 25, 2019 

I can try a 4'' frame, please send me pm.

Rc Exp   Feb 25, 2019  

your builds are amazing!!!!

IvanNik   Feb 25, 2019 

thanks, I'm trying :)

Jodie Froster   Feb 25, 2019  

I can't wait to see your post flight thoughts, and the results of your attachment techniques! The challenge of mounting tubes with precision has kept me away from them, but the structure has so many obvious benefits. I respect your ambition, and your discerning design process. I believe you have a keen mind, and are lucky, in that you have a good education to augment that. Please keep up the good work :)

IvanNik   Feb 25, 2019 

Thank you Jodie :)

MrElevator   Feb 24, 2019  

Great concept, have been wondering about tubes for arms aswell. Could you throw in some pictures without top plate and hardware?

IvanNik   Feb 24, 2019 

I did 2 frames: using a carbon fiber tow and Kevlar Cord. The Kevlar version looks clean, it defenetly better.
I added couple of photos of the second frame with carbon tow, the idea is the same..

Currently   Feb 23, 2019  

Cool build, any video? Would love to see this uberlight thing fly.

IvanNik   Feb 23, 2019 

Sorry, no video (raining) - will update later.

Guides & Reviews

8 1,286  4
9 days ago

Black Friday Sale at BetaFPV.com - Save 20% sitewide with coupon BFCM (Nov 27 - Dec 1) FPV has had quite a journey. Just a few years ago we started racing drones around a track and doing flips over trees, but professional cinematic FPV is a more recent development. DJI has always owned the drone photography market, but smaller acrobatic drones are starting to enter the market. They have the advantage..

Read more
Aug 26, 2020

For the longest time we've been limited to 3 to 4 minutes of flight and lots and lots of batteries. With more efficient motors and frame designs it's now possible to push the envelope much further. This guide will walk you through the process of building a micro long range quad capable of flying 8-30 minutes and more than 4km. The build is moderately difficult, but with the right tools and steady hands..

Read more