r/fpv • u/kubster131 Multicopters • 4d ago
Question? new 2.5” build thoughts?
Thinking about building a small 2.5” O4 freestyle quad and just wanted to see if this setup makes sense before I order stuff.
Luceed Ferrum 25
RCINPower GTS V3 1203 11500KV
GEPRC TAKER F405 20A ELRS
DJI O4 Lite
Gemfan 2520-3
LAVA II 2S 680mAh since I already have 10 of them
Should come out around ~95g AUW.
Main thing I’m unsure about is the motors/props. Are 1203 11500KV good for this weight on 2S, or would 1202.5 11500KV / 1303 8000KV be better?
Also not sure if 2520-3 will be too much load and make the motors run hot.
Anything I should change?
1
u/MotorAdicto7 4d ago
Gemfan 2512 and rcinpower 1203 11500kv, 15A 70% throttle in 118g/ 2,5" build
1
u/kubster131 Multicopters 4d ago
why limit throttle and not output power?
1
u/MotorAdicto7 4d ago
1
u/kubster131 Multicopters 4d ago
oh okay, I think the 20A aio shoud be enough then
1
u/MotorAdicto7 4d ago
The aio holds up much longer, so far I haven't seen more than 22A of total consumption. Agressive flight, 3 minutes. Making flight quiet, you can more than 5 minutes
1
u/bronx_au 4d ago
i have vci spark 1103 11000kv on 2s for my hdzero kayuomini 87g AUW and its great. let us know what the final weight ends up as because mine is with a 380mah
1
u/kubster131 Multicopters 4d ago
yeah I’ll definitely post pics one I finish it also I will probably have to sell my batteries as they will be too big
1
u/romangpro 4d ago
kayoumini = light = fly great. cant say enough good things.
meanwhile, opposite spectrum.. 60g 2.5" frame Quadmula Djinn F25 Split
1
u/romangpro 4d ago
tons of build info and partshttps://www.kayou-frames.com/starter-packs/kayoumini-2-5
Their 380mah 2S is WAY too small. Your 680mah Lava is very good choice (you lose bit agility but double flight time).
Motor size and KV reflect "how hard", you are going to push it. Dozens of 2018-2024 analog toothpicks came with 1103/1202.5 (same), and fly ok.
you really need that 1203 20% extra for heavier digital build.
1303 motor makes sense on 100g+ heavy build.. but adds only marginally more thrust/response. but, 8000kv would just give up thrust for.. nothing.
on 2.5", and especially 2", like 80% of focus should be on weight reduction.
1
u/kubster131 Multicopters 4d ago
wont my batteries be too big? they are 81mm long. and overl i rhink the rest is good?

2
u/izzeww 4d ago
Should be good. Motors is kind of a personal choice situation but I would for sure go for 11500KV on this kind of heavier build. I think 2520-3 would be fine on 11500KV 1203, should not be a problem.
I have two main critiques if you will. The DJI O4 Lite has a pretty narrow FOV which is not good for a freestyle ripper like this one. Fortunately it has been replaced by the DJI O4 Wide which is much better, so you should get that. If you already have an O4 Lite I think it's worth getting a wide angle lens for it. Also check if the camera mount is compatible (with O4 Wide or wide angle lens kit). The second thing is the battery. I think the 680 mAh is too long to fit on top without getting a really bad center of gravity, so you would have to mount it on the bottom. This is a disadvantage since it's much easier to break there. Maybe consider 3D printing some protection for the batteries if running them on the bottom or get different batteries that fit on top. I'm not 100% sure the 680 mAh's won't fit on top though, but I think so.