Big Twig 4 inch

By Glitsch on Apr 27, 2023

8 326 6

This is an iteration of my 4 inch Twig Mutant with air unit. Wanted to have onboard recording and currently not switching to dji o3. I like 4 inch because it´s fast enough for the places i fly in, fits all electronics i want and it´s half the weight of a 5 inch freestyler. The true X with battery on bottom has a very small formfactor for a 4 inch, too! Plus the batteries are much cheaper - love it!

Since there was no one who fits the full air unit into a twig mutant, i had to design my own canopy. It´s devided in two parts to have access to the FC and to fit the air unit in. Maybe i´ll figure out how to integrate a place for the xt30 into the 3d print some day.

Motors are Betafpv 1506, 3000kV. They feel nice but a bit higher kV could make it a bit more aggressive on the throttle.

Flies on tattoo 750mAh 4S. Dry weight is 190g, with battery 280g.

Photos

Part List

Frame	TWIG Mutant 4 4'' Frame Kit (True-X) (9 builds) Betafpv.com	$17.99
Flight Controller	F405 4S 20A Toothpick Brushless Flight Controller V5 BLHeli_S (ICM42688) (3 builds) Betafpv.com	$67.99
Motors	4 x 1506 3000KV Brushless Motors (2 builds) Betafpv.com	$47.96
Propellers	HQProp T4X2.5Grey （2CW+2CCW)-Poly Carbonate (6 builds) Hqprop.com	$2.99
Batteries	Tattu 14.8V 4S 650mAh 75C LiPo Micro Battery - XT30 (26 builds) Racedayquads.com	$16.59

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Discussion

vendettafpv@gmail.com Jul 16, 2023

Great build!! Can you share stl files?

Doctor_fpv May 17, 2023

i am looking at making a toothick 4 inch as well. not with DJI stuff but with walksnail. i already have a 3 inch toothpick that rips. was wondering how this is flying. i was looking at 1604 motors 3800kv. what flight time and does this feel like a boat or a racer?

Glitsch May 17, 2023

Hi, of course it´s in between these two extremes. I think it has plenty of power to catch after dives and to freestyle it. I think your motor choice should be totally fine! The walksnail vtx is much lighter than the full airunit. I fly it on 2-bladed props and even with that it´s nimble enough for me. I´m getting around 4 mins with cruising / freestyle on 750mah 4s. I wouldn´t go much bigger on the motors on that frame.

Doctor_fpv May 17, 2023

https://oddityrc.com/products/4-5inch-toothpick-frame

i am getting them to make a unibody design of this frame, also i will be using the 1s walksnail vtx just like on my 3 inch.

Glitsch May 20, 2023

Cool frame! For me the canopy mount is just a bit too tight. Walksnail has a very nice formfactor for digital vtx plus onboard recording. The vista and the airunit always make the stack so high. Doesn´t look as cool:-) Looking forward to your build.