1-2s 3-2.5" Convertable Babytooth

By Alurpal on Dec 10, 2021

12  369  3

Ive flown whoops and built a 2" 2s before this and wanted something that flew a little more snappier and efficient. I toyed with the idea of a 2-3s but when i saw people building 3" 1s quads, i wanted one. The specs on the 1202.5 11500kv motors should get >200g thrust with 2.5" props. If my AUW with 2s was 80g, then I'd get a whopping 10:1 thrust ratio. When that power isnt necessary, I can put on 3" props with 1s and should still get 6:1 (500mah 1s, 60g AUW).

Ive so far tested 1s and get 4-5min flights on 500mah. Default BF4.2 tune had bad prob wash and wobble when punching from idle of doing flips/rolls. I used the tune from https://fpvcycle.com/blogs/build-guides-and-discussion/baby-tooth-1s-3 and now it flys excellent.

Ive been using the 3018 props as pressfit and so far so good. Ill use prop screws when using 2s.



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Felias - eyefly   Jun 05, 2022  

Looks great! Did you try it out with 2s yet? Also a flight video would be amazing :-)

Alurpal   Jun 12, 2022 

Flys amazing on 1s/3" but I'm dealing with a weird death spiral on 2s when i punch the throttle. I can slow fly it in a hover around 13% throttle, but appears to lose it when punching. i tried bf4.3 default tune and still spirals. im wondering if the 1.5mm frame is just too flexible for all the thrust on 2s. ill work on the tune a little more but honestly, its such a blast on 1s with more than enough power.

Felias - eyefly   Jun 14, 2022 

I do have a similar behaviour on a different frame that definitely is too flexible, but it doesn't have any additional carbon. 1,5mm of carbon actually is quite a lot, i can't imagine this being the reason.

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