MK3 FPV Racing Drone

The objective of this project was to develop a low cost, durable drone frame with interchangeable parts that can be easily replaced. Frame designed to be sturdy enough to withstand a hard landing from falls of over 100ft. The drone pilot can have an immersive experience over a 3 mile (environment dependent) range and recording abilities with onboard GoPro.

Technical Specifications

Camera

Model: RunCam Racer Nano 2
Resolution: 1000TVL
Latency: Ultra-low latency (<6ms)
FOV: 145° wide-angle
Lens: 1.8mm

ESC and Flight Controller

Model: Diatone Mamba MK4 F722 APP F55 Stack
Flight Controller: F722 processor with Bluetooth
ESC: 55A 4-in-1 ESC (128kHz PWM)
Features: Gyro stabilization, OSD integration

Video Transmitter

Model: SpeedyBee TX800
Power: 25mW to 800mW (adjustable)
Channels: 48 with Raceband
Features: SmartAudio enabled

Motors

Model: iFlight XING-E Pro 2306 1800KV
Size: 2306 for optimal power
KV Rating: 1800KV (6S compatible)
Design: Reinforced bell for durability

Propellers

Model: HQProp 5x4.3x3V2S
Size: 5-inch tri-blade
Material: Polycarbonate

Goggles

Analog: Fat Shark Dominator

Receiver & Controller

Receiver: FrSky R-XSR
Controller: FrSky Taranis Q X7
Channels: 24 channels with OpenTX

Power System

Battery: CNHL Black Series 1500mAh 6S
C Rating: 100C
Voltage: 22.2V (6S)

Frame & Hardware

Frame: Carbon fiber custom fabricated frame
Size: 5-inch freestyle frame
Screws: M2 and M3 stainless steel
Antenna: Foxeer Lollipop 3

Evolution of a Durable FPV Drone Frame

MARC1: The Beginning

Key Objectives

Withstand hard landings from over 100 feet
Provide immersive piloting experience with GoPro recording
Achieve 3-mile range (environment-dependent)

Design Highlights

Created using OnShape cloud-based 3D modeling
Manufactured using Ender 3 Max 3D printer
Flight computer setup with BetaFlight software
Rigorous strength testing with weights

Challenges

Fitment issues with electronic parts
Structural weaknesses in initial frame
Propeller arm instability
Subpar video clarity

MARC2: The Refined Design

Solutions Implemented

Material Upgrade: High-ply carbon fiber
Interlocking arm configurations
Enhanced VTX power output
Improved tolerances through iteration

Results Achieved

Survived 150-foot drop onto concrete
5-mile round trip capability
15% weight reduction
$50 cheaper than comparable models

Why MARC2 Stands Out

MARC2 combines durability, precision, and affordability through its carbon fiber frame, refined interlocking design, and advanced features for an improved pilot experience.