It was an easy build, and the balance is exactly as I hoped it would be. Balanced and fun to toss around.
Siren F5 SX
MSRP $115.00
Direct orders from our website are $85
Once the product is available through regional distributors, the retail price will be standardized at $115
Once the product is available through regional distributors, the retail price will be standardized at $115
Weight Approx. 111g Wheel Base 245mm Frame Type Ture X Stack Mounting 30x30mm (M2/M3*) Cam Support DJI / Walksnail / HDZero/ Analog Motor Mounting 16x16mm (M3) Vtx Mounting 20x20(M2)/ 25.5x25.5(M2) Support Prop Max 5.1inch Standoff Height 20/25mm
*M3 mounting holes are supported using M2 screws with silicone adapter tubes.
Carbon Fiber
- Top Plate 2mm x1
- Front Plate 2mm x1
- Rear Plate 2mm x1
- Reinforcement Plate 2mm x1
- Lock Plate 3mm x1
- Arm 5mm x4
Hardware
- M2x23 Countersunk -4/pcs
- M3x6 Flat Head -2/pcs
- M3x6 Button Head -6/pcs
- M3x8 Button Head -20/pcs
- M3x11 Countersunk -4/pcs
- M3x14 Countersunk -8/pcs
- M3x20 7075 Standoff - 6/pcs
- M3x25 7075 Standoff - 2/pcs
- Profiled Spacer 3 - 4/pcs
Accessories
- TPU Cam Shell x1
- TPU Capacitor Mount x1
- TPU Antenna Mount x1
- TPU Action Cam Mount x1
- Rubycon 35v680uF ZLH x2
- ParaCap PCB x1
- M2 Metal Nut x4
- M2 TPU Nut x4
- M3 Rubber Spacer x10
- Damping Tube x1
- Battery Pad x1
- Battery Strap x2
* The TPU antenna mount is configured based on the selected VTX system. The default setup supports antennas using a plastic tube mount. A fully enclosed antenna mount is sold separately.
United States & Canada
- ePacket : $10
- DHL Express : $30
Europe
- ePacket : $10
- DHL Express : $30
Australia & New Zealand
- ePacket : $10
- DHL Express : $30
Other Countries
- ePacket : $15
- DHL Express : $30
Shipping Methods
- ePacket — Economy tracked shipping.
- DHL Express — Fast express delivery with full tracking.
Notes
- Select DHL Express for the fastest delivery. One free extra spare arm is included with each frame.
- Shipping methods available may vary by destination.
- If DHL Express is unavailable for your destination, we may use EMS instead.
- All packages are shipped from Taiwan.
For full shipping terms and details, please see our Shipping Policy .
TRUE X, THE QUADMULA WAY.
True X has always been one of the most proven layouts in FPV. The symmetrical motor placement gives it a natural, predictable feel, with pitch and roll responding the way you expect. Simple, balanced, and familiar. So why make another one? Because we don’t think a proven geometry means there is nothing left to improve.
With the Siren F5 SX, we kept the geometry simple and focused on the frame itself. The stiffness, weight distribution, resonance, component layout, and overall structure were developed around the way we want a QUADMULA frame to fly. The goal was never to make True X look different just for the sake of being different. It was to make it fly better.
The result is a True X that feels clean and direct. Inputs are easy to read, transitions stay predictable, and the frame remains composed when you start pushing it harder.
True X is nothing new. Our way of doing it is.
Siren F5 SX
Sale price$85.00 USD
Choose options
Siren F5 SX
Sale price$85.00 USD
Precision in Every Axis
TRUE X, REFINED
Built around a symmetrical True X layout, the Siren F5 SX delivers a naturally balanced response across pitch and roll. Its refined structure keeps every input clean, direct, and predictable, giving you a precise connection to the quad.
Cleaner Power Delivery
Dual Low-ESR Capacitor Setup
Two low-ESR capacitors are connected in parallel through a custom QUADMULA PCB. The setup lowers combined ESR, helping reduce voltage spikes and electrical noise under heavy throttle.
*With two identical capacitors connected in parallel, combined ESR is approximately half that of a single unit.
Integrated Protection
Built-In Front Bumper
The Cam Shell combines camera mounting and front protection in one piece. Fewer parts make installation easier and keep the weight lighter.
Complex Engineering, Simple Form
C-Lock T2 Rigid System
The interlocking plate structure holds each arm firmly with a tight, play-free fit. It improves rigidity and durability while reducing unwanted resonance, without adding unnecessary weight.
Maximize your time in the air
Single-Bolt Quick Swap
Our smart design allows for rapid arm replacement by removing just a single bolt. No need to disassemble your stack or disturb your electronics—get back to flying in seconds, not minutes.
HSA Lightweight System
HSA pairs custom YFS M2 stack screws with damping adapter sleeves to support both M2 and M3 mounting holes. It is 60% lighter than standard M3 stack hardware while keeping the stack securely mounted.
Maximum protection tailored to your lens
Dedicated Cam Shell
We provide dedicated Cam Shells for each supported lens, ensuring a precision fit and superior protection. Anchored by our proprietary PS-2 system, the camera is locked mechanically without compressing the TPU. This prevents material deformation, resulting in a fixation significantly more rigid and reliable than direct screw mounting.
Rock-Solid Mounting & Lens Defense
Integrated Action Base
We expanded the mounting geometry to maximize stability and eliminate camera wobble. This robust base integrates a protective design that directly shields your FPV lens from impacts.
Lightweight by Design
Strength Without Extra Weight
The Siren F5 SX keeps frame weight low without giving up the strength required for a 5" build. The weight saved gives you more freedom to choose your camera, battery, and accessories.
Parts & Accessories
Replacement arms, carbon plates, hardware, and TPU parts are available for the Siren F5 SD, covering your repair, maintenance, and build needs.
Optional TPU Accessories
Additional TPU antenna mounts are available for different antenna types and mounting layouts, giving you more flexibility to configure your build.
Official STL Files & 3D Print Support
Pick up the official TPU kit from our store, or download the free STL files and print your own protection on demand.
Use the left and right arrow keys to navigate between before and after photos.
F A Q
The Siren F5 SD supports DJI O3, DJI O4 Pro, HDZero, Walksnail, and analog video systems.
Select your intended VTX system when ordering. Each option includes the matching Cam Shell, VTX mounting hardware, and a basic tube-style antenna mount.
Switching to a different video system later is simple, only the TPU accessories need to be changed. The carbon frame is identical across all VTX options.
The standard frame kit includes:
- A TPU Cam Shell for the camera, with the matching PS-2 and screws
- A basic TPU antenna mount (tube-style), designed to secure the antenna using the plastic antenna tube
- An Action Camera Mount Base, with the matching PS-3 and screws
The fully enclosed TPU antenna mount shown in some product images is an optional accessory and is sold separately.
Arm Guards are not included in the standard frame kit and must be purchased separately if needed.
PS-2 and PS-3 are QUADMULA’s spacer system, designed to secure TPU accessories more reliably.
They create a proper mounting stop for the screws, preventing the TPU from being crushed or the screws from being left loose due to inconsistent tightening. This ensures that TPU accessories are securely mounted while allowing the screws to be tightened properly.
The standard frame kit includes the PS-2 and PS-3 hardware required for the Cam Shell, Action Camera Mount Base, and Front Bumper.
PS-3 hardware for Arm Guards is not included. If you plan to 3D print and install Arm Guards later, please purchase an additional PS-3 hardware set separately.
Customer Reviews
Overall rating: 5.0 / 5 from 1 reviews.