Tough 5mm 3K carbon fiber arms shrug off freestyle impacts and hard landings
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Frames
MARK4 5 inch 225mm Carbon Fiber Frame
The MARK4 5 inch is a 3K carbon fiber freestyle and racing quadcopter frame built around a 225mm wheelbase, one of the most widely cloned and proven 5 inch platforms in FPV.
₹2,299 + 18% GST
SKU: BOTBIT-FRM-01 · Best for: 5 inch FPV freestyle builds
Overview
About MARK4 5 inch 225mm Carbon Fiber Frame.
The MARK4 5 inch is a 3K carbon fiber freestyle and racing quadcopter frame built around a 225mm wheelbase, one of the most widely cloned and proven 5 inch platforms in FPV. It uses a true-X arm layout with thick 5mm arms that resist cracking on hard freestyle landings, and a generous stack of carbon plates that gives plenty of room to mount a 20x20 or 30.5x30.5 flight stack, an HD air unit, and a board or cased FPV camera. The frame ships as bare carbon plus hardware, so you supply the flight controller, ESC, motors, VTX and camera.
Mechanically the design favours durability and serviceability: arms bolt individually to the main plates so a damaged arm can be swapped without rebuilding the whole quad, and the wide camera cage accepts 19mm board cameras with vibration-isolating mounts. The 225mm geometry hits the standard 5 inch sweet spot, balancing agility for freestyle and racing with enough mass and prop area for stable cruising and long-range cruising lines.
It is aimed at FPV pilots building a 5 inch freestyle or racing quad, hobby shops assembling custom rigs, and training labs that need a rugged, repairable airframe for repeated crash cycles. Anyone moving from a ready-to-fly drone to a self-built FPV setup will find the MARK4 an inexpensive, forgiving starting frame.
Key features
Why it stands out.
Standard 225mm true-X geometry suits both freestyle and racing 5 inch builds
Individually replaceable arms cut repair cost and downtime after crashes
Wide deck fits 20x20 and 30.5x30.5 stacks plus HD air units and analog VTX
Vibration-isolated camera cage accepts 19mm board and cased FPV cameras
Specifications
Selection facts.
| Wheelbase | 225mm |
|---|---|
| Propeller size | 5 inch |
| Frame material | 3K carbon fiber |
| Arm thickness | 5mm |
| Plate thickness | 2.5mm |
| Frame weight | ~130 g |
| Camera mount width | 19mm |
| Geometry | True-X |
| Recommended motors | 2207 / 2306 class |
| Recommended battery | 4S-6S |
Applications
Where it is used.
- 5 inch FPV freestyle builds
- FPV drone racing quads
- DIY custom FPV drone assembly
- Cruising and mid-range FPV flying
- Training and education builds requiring crash durability
- Hobby shop and workshop kit assembly
Buying guide
How to choose.
The MARK4 5 inch is a frame kit only, so budget separately for a 4-in-1 ESC or four single ESCs, a 20x20 or 30.5x30.5 flight controller, 2207 or 2306 class motors, propellers, an FPV camera and a VTX. If you want HD video, confirm the air unit you choose fits the camera cage before buying.
Pick this frame if you value durability and cheap repairs over the lowest possible weight; the 5mm arms add a little mass but survive crashes that snap thinner 4mm arms. For pure racing where every gram counts, a lighter dedicated race frame may suit better, but for freestyle and all-round flying the MARK4 is a dependable, low-cost choice.
Buy spare arms and a hardware set at the same time. Arms are the most commonly broken part, and keeping a spare set on hand means a cracked arm after a crash is a five-minute fix rather than a grounded build while you wait for parts to ship within India.
FAQ
Common questions.
What is included in the MARK4 5 inch frame kit?
The kit includes the carbon fiber plates, four 5mm arms, standoffs and mounting screws. It does not include electronics, so you must add your own flight controller, ESC, motors, propellers, FPV camera and video transmitter to complete the build.
What motors fit the MARK4 5 inch frame?
The 16x19mm motor mount pattern accepts common 5 inch motors in the 2205 to 2306 range, such as 2207 and 2306 sizes. Match motor KV to your battery: lower KV for 6S packs and higher KV for 4S to keep current and prop loading sensible.
Does it support 20x20 and 30.5x30.5 stacks?
Yes. The deck has mounting holes for both 30.5x30.5mm flight stacks and 20x20mm micro stacks, so you can fit a wide range of flight controllers and 4-in-1 ESCs. Use soft-mount grommets to reduce vibration reaching the gyro.
Can I fit an HD air unit like DJI O3?
The frame has space for HD air units and the camera cage accepts common 19mm cameras, but always check the specific air unit and camera dimensions against the cage before buying, as fit varies between HD systems and may need a printed adapter.
Is the MARK4 good for beginners?
It is a solid first DIY freestyle frame because the thick arms tolerate crashes and individual arms are cheap to replace. Beginners should still expect to learn soldering and basic configuration, since the frame ships bare and requires a full electronics build.
What battery should I use?
Most builders run 4S to 6S LiPo packs, typically 1300-1500mAh on 4S or 1100-1300mAh on 6S for freestyle. Choose capacity to balance flight time against weight, and confirm your battery fits the strap and bottom-plate footprint.
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