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Interested or already an owner of a Kayoumini 2.5" ? The starter pack was made for you!
The purpose of this page is to bring together all the useful information you'll need to build your quad around this frame.
Quick Access
Quick Access
Useful links just a click away.
Useful links just a click away.
Useful links :
Useful links :
Official Printables (3D prints STL files and documentation)
Kayoumini ?
Kayoumini ?
Discover miniature freestyle !
Discover miniature freestyle !
the Kayoumini 2.5” aims to reproduce as faithfully as possible the flight feeling of a perfectly downscaled 5” Freestyle Quad.
The Squished X geometry and Long deck (top mounted LiPo) gives it very different flight characteristics than a toothpick, and makes it very enjoyable to zip around narrow spots.
With builds weighing in at under 100g AUW (incl battery) this little boy is the ultimate urban ripper. Low noise level and agility will allow you to unlock new spots and to send it without bothering your neighbors !
A few key points :
3mm thick unibottom, extremely rigid,
2mm thick top plate,
25.5*25.5 (whoop) and 20*20 mounting holes,
Optimized for analog (with 8mm standoffs included)
HD whoop VTX compatible (Walksnail, Hdzero) (with 12mm standoffs included)
Endless mounting possibilities !
Endless mounting possibilities !
100% modular, compatible with any camera and any tilt, with some 50+ files already available.
The development kit available on printables will give you access to the source files so you can redesign it to your own liking if needed!
Flies like a 5", but downscaled to perfection.
Flies like a 5", but downscaled to perfection.
This is one of the most important aspects of this frame : Downscaling, flight feeling and power to weight ratio.
The Kayoumini 2.5" was fully conceived around getting that downscaled 5" Freestyler feeling, and Downscaled really is the key word here.
Hitting full gas won't take you to the moon like a 6s Toothpick, a 3" 6s Freestyler or a full scale 5” quad, and that's the point ! It'll send you just far enough to extend your lines and Freestyle your local park like a mini bando, making it a playful and agile platform ready to rip, at half the scale !
With the recommended 2s setup, you'll find the throttle curve, visual cues and sensations of a 5“ quad properly scaled down to 2.5”, i.e. 2 times smaller, and that's just beautiful.
This point is easy to show by comparing the thrust-to-weight ratio of a few different type of quads,
The Kayoumini's thrust-to-weight ratio has been thought to be very similar to a classic 5” freestyle setup to get as close as possible to its flight feeling !
Build tips
Build tips
For this category we'll be going for 25.5*25.5 AIO whoop boards to keep the weight down and the build as compact as it gets.
We're talking 55-65g without lipo, and the recommended voltage is 2s.
Standoffs length
Standoffs length
The frame kit is sold with 2 included standoffs options to keep your build as light and compact as possible for any usecase :
8mm : Analog
8mm : Analog
The bare minimum :
Enough room to fit an Analog AIO. (Integrated RX and VTX, check recommendations below).
You can squeeze an external Analog VTX in there (TBS Unify Nano style) if needed.
12mm : HD, or taller builds
12mm : HD, or taller builds
Dual PCB option : AIO + HD VTX (DJI O4, Walksnail, Hdzero etc)
Standoffs are standard Aluminum M2, if you want to play around with different lengths or colors here's the reference on Aliexpress.
Motor connectors
Motor connectors
The frame is not meant to be used with motor connectors. Direct solders are recommended for maximum conductivity and to keep the build as compact as it gets.
Not every AIO is shipped with soldered motor connectors on, double check the specs on the specific one you're planing to get. They're fairly easy to remove following the video tutorial linked above if required.
DJI O4 (lite) Wide angle lens mod
DJI O4 (lite) Wide angle lens mod
Why ?
Why ?
Wide angle camera on micro platforms is a game changer, it makes you actually feel small, increases speed perception and makes small spots feel a lot bigger. It kinda is the secret sauce for the ultimate micro quad experience.
Most Analog Micro cams already come with preinstalled wide angle lenses but not the DJI O4 (Lite) ! And that's where this mod comes in handy.
How ?
How ?
With 16€ and a bit of time and finesse you can follow this Excellent Tutorial by Krhom linked below and "upgrade" to the DJI O3 lens which turned out to be the best match !
Build examples
Build examples
Struggling with assembling and positioning ? Here's a few shots from various community builds shared on Kayou Frames Discord Server.
Analog setup - Happymodel X12 + Runcam Nano 3
Analog setup - Happymodel X12 + Caddx Baby Ratel 2
Digital setup - GEPRC Taker + DJI O4
Build Videos
Build Videos
Configurator
Configurator
The best components recommended by the community for your Kayoumini 2.5".
The best components recommended by the community for your Kayoumini 2.5".
The 2S Setup is by far my favorite setup, and the one we recommend : you end up with a light, responsive, playful build that will let you have fun freestyling tight spots without going to the moon on the first powerloop.
Useful informations :
We recommend a minimum of 12A FETS on the ESCs to ensure good reliability.
You'll need to remove the motor connectors for the AIOs sold with them. (pretty quick to do).
Analog Base
Analog Base
AIO 4in1 (1S-2S ESC+FC+VTX+RX)
AIO 4in1 (1S-2S ESC+FC+VTX+RX)
1 single board for all the electronics ! Analog is clearly the preferred choice for the Kayoumini, it's easy to build, compact, lightweight and it will deliver the best flight performances.
FPV Camera (Analog)
FPV Camera (Analog)
Kayoumini fits 14mm cameras, TPUs are available on Printables for the most popular cameras on the market.
HD Base
HD Base
Camera + VTX Combo (HD)
Camera + VTX Combo (HD)
3 manufacturers are producing whoop sized Digital hardware : DJI, HDZERO and Walksnail.
Theses 2 combos will fit between the 12mm standoffs supplied with the Kayoumini 2.5".
Hdzero has turned the market by surprise with the only AIO integrating a digital VTX to date !
Just like an Analog setup, it fits between 8mm standoffs.
AIO 3in1 (2S ESC+FC+RX)
AIO 3in1 (2S ESC+FC+RX)
As you'll be using an external VTX you don't need an integrated Analog one in your AIO.
Other parts
Other parts
Motors
Motors
The 2s 2.5” baseline is 1103. Feel free to go bigger for more power, smaller to save weight, or play around with different Kv.
Pick the perfect Kv !
Pick the perfect Kv !
As mentioned above, the Thrust-to-Weight ratio that gets us closest to the flight feel of a 5" freestyle mini quad is around 7,8.
So we've calculated and plotted the curve of the optimal Kv based on weight to hit exactly the flight feel you're aiming for according to your build !
The conclusion is :
Analog : 7500kv to 9000kv.
Digital : 9000kv to 11000kv.
Budget pick
Budget pick
Outstanding quality for an unbeatable price.
Entry-level, clearly not the most durable or well built motor but excellent value for money.
High end
High end
Great High end motor, suits both Analog Lightweight and heavy O4 Builds with 2 kv options : 7500 and 11000
High end high quality motor, 1104 will give you great punch without popping out of the carbon frame designed for 11xx motors.
Only available in 7200kv, so mostly suited for lightweight Analog builds, 80mm cable length version required.
LiPo
LiPo
The deck is only 50mm long, so be careful which lipo you choose. We recommend 2s 300-450mAh for a flight time of 2 to 6 minutes, depending on how hard you push it. The weight of your Quad matters a lot aswell, Digital Builds will tend to have sub 4min flight time.
Legend has it that they were born for the Kayoumini. They fit perfectly on the deck and offer the best compromise between weight, performance and flight time for freestyle.
Propellers
Propellers
We're talking 2.5” or 65mm, try a few and see which ones suit you best !
Our favorite pick.
Be carefull, Gemfan also sells 2512 props with way less pitch and way less thrust as they're made for Toothpick/1s quads, make sure to grab 2520 !
Careful - two-bladed props might require more tuning experience.
Enjoy !
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