I've been wanting to build a 4" ultralight since the day I saw the HQ T4x2.5 bi blades. iFlight's 1404 4600kv Xing motors with their T mount made a perfect choice to pair up with them. However there really weren't any frame options at the time that I felt really suited the pair.

Then along came the Twig Mutant 4! From there the rest of the components were easy. The BetaFPV 20a aio is plenty to handle the motor/prop combo and has that whoop form factor for the frame. The vtx I chose was the Nameless 400mw for its super tiny size and I went with a good old xm+ for a receiver because they always serve me well.

In the end, I got a 4s 4" quad that weighs only 113.9g without a battery! With an RDQ 650mah HV 4s it still only weighs 174g!.... Amazing

The performance is very impressive with instant acceleration and on-rails cornering. Heavy throttle flights will lead to less than 2min flights on 650mah so maybe an 850mah is worth a shot.

So happy with the end result of this build. I highly recommend one if you're considering it!