Serval
A perfectly balanced 5-inch racing frame. Tough, practical, easy to build, and fully open source.
Frame kit 2.5
~€48
17500 HUF
Arm kit 2.5
~€22
8000 HUF
The winner is thinner.
Most frames keep the same thickness along the whole arm. The Serval 2.5's tapered arm is both tougher and lighter.
I ran simulations on 15 different arm shapes, and one of the lightest turned out to be the strongest. Hard to believe, right? I validated it in the lab and turns out, it’s true.
Practical and easy to build.
The Serval’s wide top plate protects your VTX from costly midair hits. It has plenty of space to build. You can use a capacitor and even a stack saver.
And yet, a full Serval build with battery is only ~1% heavier than a MS25, Zigzag or LightSwitch Ultra.
Serval build
~477 g
Frame: 56g
ZigZag build
~471 g
Frame: 51g
Fully open source.
The best way to buy a Serval is from the Tressym Shop, but you can also cut your own.
Modify it, remix it, even sell it if you want - just link back to this page!
This also guarantees fair prices everywhere, forever.
Fits all cameras and antennas we could think of.
Something missing?
Maybe I can design it for you.
All camera mounts, VTX mounts and fins are open-source, editable, parametric Onshape files. Change them however you want. Go nuts.
Tressym Serval
Design Lead
Contributors
Version history
- 1.12Feb 2025
- First production version.
- 2.4Sep 2025
- A major redesign making the arms much stronger, especially in Y-axis crashes. Switched to T700 carbon fiber and grade 12.9 carbon steel.
- 2.5Jun 2026
- A slight revision of the arms, making them a bit stronger. Introduced the Pro material variant, the strongest so far.
Compatibility
| 1.12 | 2.4 | 2.5 | |
|---|---|---|---|
| 1.12 | Full* | Full* | |
| 2.4 | Full* | Full | |
| 2.5 | Full* | Full |
*When switching arms, switch both left and right arms at the same time.
Specifications
Weight
~56g
Frame kit without TPU parts and stack screws.
Material
T700 carbon fiber
Plain weave, matte finish. Pro material variant available (the strongest so far).
Stack mounting
20x20
Motor mounting
16 mm
Stack height
23 mm
Arm thickness
5 mm
Plate thickness
2 mm
Fits most 20x20 ESCs
For example: Foxeer Reaper Slim 60A, Flycolor Trinx G20, Diatone Mamba F65_128K Mini, Diatone Mamba 5 Reactor_66.
Fits HDZero Nano 90, and most Nano analog cameras
For example: Foxeer Predator Nano.
Frame kit contains
4x Arms
1x Mid plate
with 6x M3 black carbon steel pressnuts, pre-installed
1x Bottom plate
1x Top plate
2x Stiffeners
4x 25mm black aluminium standoffs
Gold colored standoffs also available upon request
4x M3x25mm countersunk stack screws
Grade 12.9 black carbon steel
4x M3 steel/nylon hex self-locking nuts
Weight: 1.66g
4x M3 nylon nuts
Weight: 0.22g
4x M3x16mm countersunk arm screws
2x M3x12mm countersunk center screws
4x M3x6mm top plate screws
Decorative leaflet with build tips and assembly diagram.
Arm kit contains
4x Arms
Side brace kit contains
2x Side braces
Front/back brace kit contains
2x Front/back braces
Digital/high-end build
ESC
Sequre Blueson A1
This super-cheap ESC actually delivered excellent performance in Chris Rosser's ESC test. The only drawback is its slightly higher weight.
Flight controller
HDZero Halo Flight Controller
Great pad layout, integrated Gemini ELRS receiver, good value for money.
Camera
HDZero Nano 90
The camera for the HDZero system.
Video transmitter
HDZero Race VTX
Ultra low latency and 90fps makes HDZero the best for racing.
VTX antenna
Foxeer Lollipop Micro
Great price, reliable.
Motors
T-Motor F60 2207 1950KV
An excellent motor overall. Believe me: 1950KV is more than enough.
Propellers
Gemfan Yuki 5129-3
Low pitch propellers for better control.
Batteries
6S batteries 1200-1400mAh
I'd recommend Tattu / Boslipo for performance or Ovonic for value.
Analog/budget build
ESC
Sequre Blueson A1
This super-cheap ESC actually delivered excellent performance in Chris Rosser's ESC test. The only drawback is its slightly higher weight.
Flight controller
HDZero Halo Flight Controller
Great pad layout, integrated Gemini ELRS receiver, good value for money.
Camera
Foxeer Predator Nano
The best analog camera for racing.
Video transmitter
TBS Unify Pro32 Nano VTX
Tiny weight, with enough power for a race.
VTX antenna
Foxeer Lollipop Micro
Great price, reliable.
Motors
Flyfish Sword 2207 1950KV
Unbeatable price, okay durability.
Propellers
Gemfan Yuki 5129-3
Low pitch propellers for better control.
Batteries
6S batteries 1200-1400mAh
I'd recommend Tattu / Boslipo for performance or Ovonic for value.
Check out my videos!
Follow along with the development of Tressym frames in my two-minute shorts!
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