Low Budget Beast Class

By Tyrdle on Jul 09, 2020

20  716  3

I could write pages and pages about building and tuning this quad. It is a whole lot of quad for $300 but it was also a whole lot of pain in the ass to get it working properly. Would not recommend

The frame was cut by CNC Madness in 3.0mm carbon for every part. His tolerances were perfectly spot on and I am very happy. It cost me $62 shipped for all of the carbon parts and about $20 for aluminum tubes. I can upload the frame files if there is any interest but it's a seriously stupid build.

The motors are interesting as they are made by a company which apparently went out of business. They are branded as 4822 motors but after opening one up they actually measure at 4008. They only came with about 3" of motor wire so I had to extend all of them and later wrap them all in paracord.

Some issues:
Fitting all the parts inside: The inside of this quad is only about 45mm square by 17mm tall. It has a single 30x30 board inside and a crossfire nano rx. The VTX is taped to one of the arms.

Extreme I-term windup: The motors are undersized for the size and weight of prop i'm using. This means I-term is accumulating a ton of error all the time and it took me weeks to get the quad flying in the first place. What got me to a point where I could even start tuning was setting I to 30 on every axis and turning off anti-gravity.

Frame resonances: After switching from the brittle 10mm carbon square tubes to 3/8" aluminum square tubes I had a decent amount of resonance in certain movements. It doesn't seem to be an issue now that I have made the tune half decent but it is something to consider whenever making an aluminum frame (or any frame).

Photos

Discussion

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chawks   Nov 25, 2020  

hi man, is this a 6s build? im impressed with how you made the quad for such a good price

Tyrdle   Nov 30, 2020 

yeah it's 6s i use 1000 or 1100mah in parallel

kwadkenstine   Jul 09, 2020  

Verry cool , thanks for the Insight

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