Direct orders from our website are $75
Once the product is available through regional distributors, the retail price will be standardized at $102
Spec
Weight
Approx. 74g
Wheel Base
167mm
Frame Type
Sqaushed X
Stack Mounting
20x20mm (M2/M3*)
Cam Support
DJI / Walksnail
Motor Mounting
12x12mm (M2)
Vtx Mounting
20x20(M2)/ 25.5x25.5(M2)
Support Prop
Max 3.6inch
Standoff Height
20/26mm
*M3 mounting holes are supported using M2 screws with silicone adapter tubes.
What's in the box
Carbon Fiber
Top Plate 2mm x1
Front Plate 2mm x1
Rear Plate 2mm x1
Lock Plate 2mm x1
Arm 4mm x4
Hardware
M2x6 Button Head -16/pcs
M2x23 Countersunk -4/pcs
M3x6 Flat Head -2/pcs
M3x6 Button Head -10/pcs
M3x10 Countersunk -4/pcs
M3x13 Countersunk -6/pcs
M3x14 Countersunk -4/pcs
M3x20 7075 Standoff - 6/pcs
M3x26 7075 Standoff - 2/pcs
Profiled Spacer 3 - 6/pcs
Accessories
TPU Cam Shell x1
TPU Front Bumper x1
TPU Capacitor Mount x1
TPU Antenna Mount x1
TPU M2 Nut x4
TPU Action Cam Mount x1
Rubycon 35v390uF ZLH x3
ParaCap PCB x1
HSA Tube x1
M2 Rubber Spacer x20
Battery Pad x1
Battery Strap x2
Backup Screw Pack x1
* 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.
Installation Space
Recommended parts
Flight Controller
20x20 M2/M3 Mounting Hole
ESC
At least 30A 4-6S
Motor
4S: 3500-4000kv 6S: 2400-3000kv with 12x12mm mount base
Prop
3.5" - 3.6"
Battery
4S 850-1200mah 6S 750-1050mah
Shipping Information
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 .
The SirenA F35 represents a new chapter for our 3.5" lineup. While the original Siren F35 earned its place in the sky, we heard a distinct call from the community: you wanted something that could survive the impossible. You asked for a frame that pushed the limits of durability without losing its soul. SirenA series is our answer.
We reimagined the entire structure, constructed from QUADMULA’s signature high-grade carbon fiber. Known for its exceptional stiffness and durability, this premium material forms the backbone of the frame. Furthermore, the chassis geometry has been meticulously reshaped to act as physical bumpers, safeguarding your electronics when things go wrong.
For the electronics, we introduced an unprecedented Triple Capacitor Matrix for the 3.5" class. By designing a custom PCB, we’ve taken the hassle out of installation, ensuring your stack receives the cleanest possible power. It’s a complex design choice we made so your build experience could be simple.
We also took a fresh approach to protection. Instead of a rigid aluminum cage, we developed a new TPU philosophy with Dedicated Cam Shells. We believe this offers superior impact absorption for your lens while giving you the creative freedom to swap colors and customize your rig—something metal simply can't offer.
Countless hours of design, testing, and refinement went into this frame. We fought for every gram to ensure that while the strength increased, the flight performance remained uncompromised.
This is a true Bando frame that retains the agility of a lightweight build. Experience absolute durability without the compromise.
Engineered for pilots who exist at the ragged edge of control. Featuring rigid 4mm arms and a heavily reinforced chassis, the SirenA prioritizes survival above all else. The calculated structural weight adds a sense of inertia and confidence to every maneuver, ensuring you keep flying while others are walking home.
Pure Power Delivery
Low-ESR Triple Capacitor Matrix
We’ve moved beyond standard filtering. By utilizing a custom QUADMULA parallel PCB, our innovative 3-capacitor array dramatically lowers ESR compared to traditional single-cap setups. This delivers cleaner power to your ESC, guaranteeing maximum stability and silky-smooth flight performance, even under the heaviest throttle loads.
Based on the principle of ESR (Total) ≈ ESR (Single) / 3, distributing the equivalent capacity across three units achieves significantly lower resistance than a single large one.
Steel & 7075 Aluminum Backbone
Full M3 Architecture
We took a zero-compromise approach to the primary chassis. By utilizing substantial M3 hardware and robust 7075 standoffs for the main structure, we achieved a level of torsional rigidity and impact resistance rarely seen in this class. It’s calculated overkill, ensuring your frame remains rock-solid flight after flight.
Complex Engineering, Simple Form
C-Lock T2 Rigid System
At the heart of the SirenA lies our C-Lock T2 technology, a mechanical interlocking system designed to eradicate arm slop and vibration. It ensures the frame remains stiff and responsive, creating a direct, telepathic connection between your stick inputs and the quad’s movement.
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
Introducing our proprietary Hybrid Screw Assembly (HSA). By pairing custom YFS M2 hardware with a specialized vibration-damping sleeve, this system offers full M2 and M3 stack compatibility. This smart design slashes weight by 60% compared to standard M3 bolts without sacrificing structural security.
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.
We designed a comprehensive protection suite for this frame. Pick up the official TPU kit from our store, or access the free file library to print replacements on demand.
Use the left and right arrow keys to navigate between before and after photos.
F A Q
Why is the motor mount 12x12mm only?
We chose to exclude the 9x9mm pattern for two critical reasons:
Durability First: Supporting dual mounting patterns requires removing excessive material from the arm ends, creating stress risers that weaken the carbon. The single 12x12mm layout keeps the arm tip solid and robust.
Performance Consistency: 9x9mm motors (commonly 1404 size) are generally underpowered for the SirenA's reinforced chassis. We designed this frame to be flown with high-torque motors that utilize the 12x12mm standard, ensuring you get the locked-in flight experience we intended.
A Note on the 250g build
The SirenA 3.5” was engineered with a singular focus: Bando and Aggressive Freestyle. To achieve the structural integrity required for this level of abuse, we prioritized absolute durability over ultralight metrics.
While we have optimized the weight as much as possible, the reinforced nature of the SirenA makes a sub-250g AUW virtually impossible without severely compromising component selection. Forcing a sub-250g build on this frame would result in an unbalanced setup and a poor flight experience.
Choose the right tool for the job:
If a strict Sub-250g limit is your priority, please choose our standard Siren Series.
If you demand a tank that survives the hardest hits, the SirenA is for you.
Customer Reviews
Overall rating: 5.0 / 5 from 38 reviews.
Very nice frame. Seems like it will be very durable and looks awesome. This was my first build so I do not have a ton of experience but it was a very tight space for me to fit everything especially with triple capacitor bank. Overall it seems very high quality. The only real complaint I have is that the camera mount supplied with hdzero build kit does not seem to be designed for hdzero at all. Nano 90 v2 camera sits so far back in mount that it looks like you are looking through a telescope. I had to reprint it with about 3mm sliced off the front of mount. Other than that the quality of the tpu prints is amazing. Also there were not really any instructions. Would definitely be nice if it came with instructions with frame.
The SirenA f35 It really is the best 3.5-inch quadcopter you can get. Not only does the little guy fly perfectly, but it’s also incredibly rugged and can take a real beating.
The Quadmula SirenA is an excellent freestyle frame—lightweight, durable, and designed with a clean deadcat layout that keeps the propellers out of the camera view. It has a solid, practical design that makes building and maintaining the quad straightforward, while giving you plenty of room for HDZero hardware. A great choice for smooth, flowy freestyle flying and clean footage.
My version of the SirenA F35
Build with 6S
Axisflying Argus mini F7 AM32 Stack.
RCInpower 1804 GTS V3 2450kv
Radiomaster RP3
Airunit 04 Pro
Gemfan 3630 props
and a little beeper.
It's flying really great. Was super easy to tune. No frame resonances at all.
I'm not a bando-basher but fly most of the time over concrete. So i replaced the alluminium TPU spacers with ones i made from hardened C-steel.
The only thing i don't like about this quad (and my other ones from Quadmula)... There is no space to add a normal buzzerr like the one from Matek. Or even a Vifly Mini. This would be great. Had to mount a really tiny one in the rear antenna-holder.
Let me just start by saying i got into this hobby with a 3.5inch frame by a different company and siren F35. Instantly fell in love with F35 chassis and proceeded to build an F5 S2 and SirenA F35. Built this one on january 22nd of 2025 so this will be a 4 months review!
Build experience
- I was extremely satisfied with 2 things : large space and PCB setup. I was able to conveniently fit a buzzer, PCB setup and a receiver! Also, installing dual capacitor setup for siren F5 S2 was not an easy task but this triple PCB setup was a breeze.
Actual flying(or bashing) experience
- Quadmula claims that they created this frame to withstand brutal abuse and they were certainly not lying. I always order 2-4 extra arms with my frame orders and have not had to replace one just yet. It's worth mentioning that i built mine as a 6S build weighting at 288g dry weight so crash impacts are certainly huge for a 3.5 inch chassis.
Overall, It's always a pleasure to build and fly quadmula frames. The packaging, quality, customer service and agile flying characteristic everything just lines up perfectly 👍
I have a Quadmula-Frame in every size but is is the best frame for me.
A perfect freestyle frame for a not so perfect pilot.
I ran it in the ground or against obstacles and all it needs to bring it back in the air is a new set of props.
Less repair - more flying. I like this a lot.
Quadmula!!! What can I say!!??
The SirenA F35 is hands down the most precise, detailed and robust frame I have ever flown! Honored to be selected for the draw to review such high quality craftsmanship drone frame. I've paired it with Geprc SpeedX 2105.5 - 2850kv motors, Goku H743 Pro FC, Goku 45A esc, HQ 3.5 props, DJI04 Pro and Tattu V6 1050 6S lipo. This combination has blown me away with speed and agility for freestyle in the Yukon. An amazing addition to all of my quadmula frames that I've been flying over the past few years! Not gonna lie but this SirenA F35 is getting way more flight time these days. To anyone considering building a drone....quadmala is the best in the industry!
Happy flying to all!
Limitless FPV
I can’t say enough good things about Quadmula frames. I own the Djinn F25 SP, the Siren F5 S2 and this SirenA F35. I can speak from experience on the durability of this frame. I spent an afternoon trying gap a hole in a brick wall about the same size as the quad. Twenty times I hit the wall at a considerable speed, not once did I hit the gap. No damage to the O4, no major damage to the frame. I’m starting to think I’ll never have to use the spare arms I bought. Bottom line is… If you haven’t chosen a Quadmula frame, you’ve already made the wrong choice.
I usually fly and build only 5inch Freestyle Frames BUT!!! The Quadmula SirenA F35 was my first ever 3.5inch build and it’s a Ripper of a Quad, the Quality of the frame is absolutely outstanding and so well made and thought out. I enjoy it that much and with the DJI 04 Pro fitted it beats all my other drones hands down, well down and thank you Quadmula.
A simple intuitive build, the extra deck space was really useful and made the whole experience really straight forward. Built with a GOKU F722 Pro mini V2 stack, DeepSpace 2006 2550Kv 6S motors and O4 Pro. I designed a couple of custom TPUs to hold the power lead the a Radiomaster RP1 - You can find them on thingyverse if you look up the user "AlvaroFPV".
One of the builds I enjoyed building
This thing is an absolute ripper… super fun to fly.
For a freestyle noob like me, this frame is proving to be seriously tough 💪
Congrats to Quadmula for this frame
It's one of my favorite builds, and even more enjoyable to fly. Tuning was a breeze, as it always is in Quadmula frames. From the carbon, to the paracap system, and even the TPU nuts, there's nothing left out, and at a very fair price. I recommend Quadmula frames as everyone’s first build for these reasons. It's more than a drone, it's a work of art.
It’s not like the older 3.5" quad systems. If you’re flying in a small bando and want to build an ultra-durable quad that isn’t quite as powerful as a 5-inch (but still very powerful), this would be the best choice. As you can see in the photos, I’m using a DeepSpace Aether 2006 2550KV motor, Gemfan 3630 props, and Foxeer F722 electronics with a Foxeer 45A ESC.
This setup performs brilliantly. The energy distributed across three capacitors takes the load off the ESC and helps you recover much better from sudden, sharp inputs. You wouldn’t believe how many hard crashes I’ve had with it yet it just keeps going without a care. This thing is absolutely phenomenal!!! I LOVE IT!! No matter how much I thank the Quadmula team, it’s never enough!
I don’t think I’ve seen a higher quality frame than this. Decided on going with a Flywoo F722 mini stack and paired it with some Aether 2006 2550kv motors and had to go with the 04 Pro vtx. Added some high quality TPU prints to button it up. This is a perfect 3.5”.
Impressive. The quality of the frame, from TPU to the nuts and bolts that hold it all together, #chefskiss
I decided to build her a bit outside the "norm" for me, usually I try to stay under the fairy limit, but this girl...whooo she's hefty, but that's ok, because she definitely uses that weight to her advantage!
HDZero Stack, Brotherhobby 2005 2800kv motors, HDZeroRace V3 vtx, HDZero Micro Camera, Gemfan 3.6inch props
This thing is badass, flies smoother than any 3.5” I’ve built. Used VCI 1605 2450kv and 6s, and I’m so happy with it. Flies beautifully with minimal tuning. Was a little concerned with the extra weight and no 9x9 mounting holes, but support reassured me and recommended some build guidelines. Might be my favorite quads of all time because of the power, durability and how smoothly it handles. Will be building more!
This is another stunningly beautiful frame. It's absolutely perfect in the air. When cruising, the SirenA F35 is smooth in the turns, giving the feeling that it's gliding through the air. As soon as you really get the throttle going, it responds instantly to roll and pitch, just as it should. The SirenA F35 is more like a Bando freestyler.
Very nice frame. In front plenty of space, no strungle to fit all equipment inside. Back side stayed the same as siren f3, but o4 takes less space then o3. Arm thickness 4mm exactly good for 3,5”. Use motors with 5mm shaft, because all props of this size with 1.5 mm are tooooo britle, but with this frame u want to hit walls and tree branches and recover but 1.5 mm props fly away in many pieces on light touch.
Amazing frame. Looks tough..need to remember this is still a 3.5 inch frame my 20 x 20 ESC stack I ordered was too big to fit between the standoffs. Now I am waiting on a smaller stack that fits. Can’t wait to fly it!
