MARK4 HD7 Lite 7-Inch FPV Drone Frame Kit - 295mm Wheelbase Carbon Fiber

Specifications

• Frame Type: H-Frame / Deadcat Hybrid (Wide-X)

• Wheelbase: 295mm (Motor-to-Motor Diagonal)

• Arm Thickness: 5.0mm

• Top Plate Thickness: 2.0mm

• Bottom Plate Thickness: 2.5mm

• Side Plate Thickness: 2.0mm

• Camera Mounting Width: 19mm (Micro) / 20mm (DJI/Walksnail)

• Flight Controller Mounting: 30.5x30.5mm & 20x20mm

• VTX Mounting (Rear): 30.5x30.5mm & 20x20mm

• Motor Mounting Pattern: 16x16mm / 19x19mm

• Material: 3K Carbon Fiber

• Standoff Height: ~30mm

Key Applications and Projects

• Mountain Surfing: Utilizing the massive efficiency of 7-inch props to carry long-range transmission gear miles away over rugged alpine terrain.

• Cinematic Heavy-Lifter: Mounting heavy GoPros or mirrorless action cameras to capture perfectly stable, high-speed chase footage of cars or boats.

• Autonomous Surveying: Building an INAV-powered mapping drone capable of flying pre-programmed GPS waypoint missions over agricultural fields.

Unlock New Capabilities (Project Evolution) The Cross-Country Autonomous Cruiser: Don't just fly; explore! Pair the MARK4 HD7 Lite with large 2806.5 (1300KV) stators spinning HQProp 7x4x3 bi-blades. Install a Matek F405-TE flight controller running INAV firmware. Add a Matek M8Q GPS compass module to the top plate and a 900MHz TBS Crossfire Nano RX. Power the entire rig with a custom-built 6S 21700 Lithium-Ion pack strapped to the spacious top deck. You have just engineered an autonomous, long-range cruiser capable of executing 10-mile round-trip waypoint missions, equipped with a fail-safe "Return to Home" function if you ever lose video signal!

Package Includes:

• 1x Top Plate (Carbon Fiber)

• 1x Bottom Plate (Carbon Fiber)

• 4x 5mm Independent Arms (Carbon Fiber)

• 2x Camera Side Plates (Carbon Fiber)

• 2x Side Support Brackets (Carbon Fiber)

• 1x Assorted Machined Aluminum Standoffs (Silver/Textured)

• 1x Complete M3 Hardware Kit (Screws and Nuts)

• 1x High-Strength Battery Strap

FREQUENTLY ASKED QUESTIONS (FAQ)

Q: What does a 295mm wheelbase mean? A: Wheelbase is the exact diagonal measurement from the center of the front-left motor shaft to the center of the rear-right motor shaft. 295mm is specifically sized to provide enough clearance so 7-inch propellers do not hit each other or the central fuselage.

Q: Can I run 5-inch or 6-inch props on this frame? A: Yes, you can run smaller props, but it is highly inefficient. The frame's weight and geometry are optimized for the lift generated by 7-inch propellers.

Q: What size motors should I use for a 7-inch build? A: Standard 5-inch motors (like 2207 or 2306) will overheat and burn out trying to spin heavy 7-inch props. You must use larger stators, highly recommended between 2806.5, 2808, or 2810 sizes, typically with a KV rating of 1300KV for 6S setups.

Q: What is the thickness of the arms? A: The arms are cut from premium 5.0mm thick carbon fiber to prevent flexibility and low-frequency vibrations.

Q: Is this a unibody frame? A: No. The MARK4 utilizes an independent arm design. The four arms are separate pieces of carbon fiber sandwiched between the bottom plate and a mid-plate.

Q: Why is an independent arm design better for large drones? A: If you break an arm in a crash, you only have to unbolt and replace that single carbon fiber arm. On a unibody frame, breaking one arm means throwing away and replacing the entire bottom half of the drone.

Q: Will the DJI O3 Air Unit fit inside? A: Yes, the "HD" designation means the central and rear bays are extended and spaced specifically to accommodate the heat sinks and dimensions of modern HD video transmitters like the DJI O3, Vista, or Walksnail Avatar.

Q: What are the camera mounting dimensions? A: The included carbon fiber side plates are spaced to hold standard "Micro" sized (19mm wide) analog cameras, as well as 20mm digital cameras (like DJI).

Q: Can I mount a 30.5x30.5mm flight controller stack? A: Yes, the central bay features standard 30.5x30.5mm M3 mounting holes for full-sized FC/ESC stacks, as well as 20x20mm holes for mini stacks.

Q: Are there mounting holes in the rear for a VTX? A: Yes, the rear tail section features both 30.5x30.5mm and 20x20mm hole patterns to securely bolt down your video transmitter.

Q: Do I need to buy a specific battery for a 7-inch drone? A: 7-inch drones draw massive continuous current. It is highly recommended to use a large 6S LiPo battery (1300mAh to 1800mAh) for freestyle, or a 6S Lithium-Ion pack (3000mAh to 4000mAh) specifically for low-throttle, long-range cruising.

Q: Does the kit come with a 3D-printed GPS or antenna mount? A: No, this is the "Basic Unassembled Kit." It includes the pure carbon fiber plates and metal hardware only. Any specialized TPU mounts must be 3D printed or purchased separately.

Q: How do the textured aluminum standoffs help? A: The included standoffs feature a knurled/textured surface. This provides extra grip for your fingers or pliers when tightening the frame together, ensuring the screws lock down securely without slipping.

Q: Is this an X-frame or an H-frame? A: It is a hybrid. The central body resembles an H-frame for maximum component space, but the arms are angled to resemble a stretched "Deadcat" or "Wide-X" geometry, which helps keep the front propellers out of your HD camera's field of view.

Q: Does it come with a printed instruction manual? A: Frame kits rarely come with paper manuals. However, the assembly is straightforward: the arms sandwich between the bottom plate and the brace plate, and the standoffs connect the bottom assembly to the top deck.

Q: Do I need threadlocker for assembly? A: Yes, because 7-inch drones generate significant vibrations, it is highly recommended to use a drop of medium-strength (blue) Loctite on all metal-to-metal screws (especially the arm bolts) to prevent them from backing out mid-flight.