Squirrel 35

By derV on Jan 22, 2024

13  0  10

Balance is the key!
I designed that frame with two objectives in mind:

  • As much power as possible while still under 250g
  • Get the CoG right in the propline

To get a motor with maximum thrust I contacted T-Motor (who had an already pretty good motor in ther lineup) and convinced them that a little more kV, some small changes on the stator and a nice paint-job on the bells would provide the perfect package for this whole category (250g 3.5")
To get the biggest mass (battery) centered in the prop-line I reduced the stack-mounting options to 25.5mm or 20mm AIOs (8mm high + 2mm for stack-nuts) and designed the arms around those.


Part List


The Squirrel 3.5 frame-kit

Flight Controller



4 x RubberQuads 3-5 brushless motor


HQ 3.5x2.5x3

FPV Transmitter

DJI O3 Air Unit Transmission Module (27 builds)


expressLRS EP1 receiver (2.4GHz)


Gaoneng GNB 15.2V 4S 650mAh 120C LiHV Micro Battery - XT30 (3 builds)
Show stores (3)


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rubinT   May 20, 2024  

Hey man. Just bought most of the parts to do the build. What radio and goggles can i use for this? Also, the DJI parts, did you install just the transmission module or the whole O3 Air unit? Will let you know how the build goes

derV   May 20, 2024 

To fly it FPV you will need to build it with a full O3.
As for a transmitter to use: Any expressLRS radio will bind to the receiver you ordered. I personally use an X-lite with an expressLRS module but for convenience I would suggest the Jumper T20 (good build quality for the price, works for thumbers and pinches) or about any one of radiomasters lineup.

quad66   Feb 26, 2024  

what's the kv on the motors?

derV   Feb 26, 2024 


maxe   Jan 23, 2024  

very nice copter, I think it's very well done

Show 2 more comments
derV   Jan 27, 2024 

If you build it with an analog VTX there might be budget for a naked gopro :-)

derV   Jan 27, 2024 

p.s.: there is a giveaway for one framekit on instagramm until next week!

maxe   Jan 27, 2024 

I'm sorry, I don't have Facebook, Instagram or anything like that

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