Name: QR-31 Frame Kit
Brand: Sentinel Dynamics
SKU: QR31-FRAME-001
Availability: PreOrder

QR-31 · 3.5" Multirotor Frame Kit

Multirotor Frame Kit Coming Soon

QR-31 Frame Kit

3.5" Indoor Reconnaissance & Training Airframe

Prop Class

3.5"

Motors

1804 2450KV

FPV

Analog · 19×19

Flight Time

8–12 min

Battery

850–1400mAh

Origin

NC, USA

A compact 3.5" multirotor frame kit purpose-designed for interior reconnaissance, confined-space navigation, and pilot training — where size, maneuverability, and low risk of collateral damage matter more than endurance. Set up for analog FPV with a 19×19mm camera and built around durable PA612-CF nylon. The kit ships ready to install electronics: all heat inserts are pre-installed, every bolt needed for assembly is included, and a battery strap comes in the box.

Coming Soon — Jun 26th

Not yet available · Join the waitlist for launch & pricing

Platform Details

This product is in development. Join the waitlist to be notified the moment the QR-31 Frame Kit is available.

Free ShippingOn every order

Fast ShippingQuick dispatch

USA DesignedNorth Carolina

Launch AlertsBe first to know

Ready to BuildHardware included

Product Supportsupport@sentineldynamicsllc.com

The Sentinel Dynamics QR-31 is a compact 3.5" multirotor frame kit built for the spaces most platforms can't operate in. Purpose-designed for interior reconnaissance, confined-space navigation, and pilot training, it prioritizes size, maneuverability, and low risk of collateral damage over endurance. The kit ships ready to install electronics — set up for analog FPV with a 19×19mm camera. The QR-31 Frame Kit is currently in development — join the waitlist to be notified the moment it launches.

Design Intent

3.5" prop class and compact frame geometry for doorways, hallways, and confined structures
Set up for analog FPV with a 19×19mm camera
Comes ready to install electronics — all heat inserts are pre-installed
Every bolt needed for assembly is included, along with a battery strap
Durable PA612-CF nylon construction prioritizing structural rigidity

Who This Is For

Operators who need an interior reconnaissance and confined-space platform
CQB and indoor recon use cases where size and low collateral risk matter most
Training programs needing a low-consequence, fast-turnaround trainer
Builders who want a compact, durable airframe that's ready to build

Power & Flight

Battery capacity: 850–1400mAh — battery strap included
Flight time: 8–12 minutes per pack
Analog FPV system with a 19×19mm camera

The QR-31 Frame Kit arrives with all heat inserts installed and the hardware needed for assembly in the box — drop in your electronics and fly. The default configuration is built around a 20×20 AIO flight controller, mini-style VTX, 1804 2450KV motors, a 19×19 analog FPV camera, and an ELRS / Crossfire receiver and antenna.

Coming Soon

The QR-31 Frame Kit is in active development. Join the waitlist and we'll notify you the moment it's available, along with pricing and launch details.

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Platform Overview

Learn more about the QR-31 platform — its mission profile, capabilities, and where it fits in the Sentinel Dynamics lineup.

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Replacement Parts

Platform-specific replacement components for the QR-31 will be available alongside the full platform release.

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Specification	Value
Airframe
Platform Class	3.5" Multirotor (Quadcopter)
Prop Class	3.5 inch
Build Method	FDM Additive Manufacturing
Design Origin	North Carolina, USA
Architecture	Compact, frame-kit construction
Mission Profile
Primary Role	Interior reconnaissance & confined-space navigation
Secondary Role	Pilot training / high-repetition flight
Range	Short range
FC Firmware	Betaflight, Ardupilot
FPV & Electronics
FPV System	Analog
Camera	19×19mm Analog FPV
Flight Controller	20×20 AIO (default configuration)
VTX	Mini-style VTX (default configuration)
Motors	1804 2450KV (default configuration)
Receiver	ELRS / Crossfire — receiver & antenna
Power & Flight
Battery Capacity	850–1400mAh
Flight Time	8–12 minutes
Battery Strap	Included
In the Box
Heat Inserts	Pre-installed
Assembly Hardware	All bolts for assembly included
Electronics	Ready to install (not included)
Materials
Frame	PA612-CF Nylon
Shipping
Cost	Free shipping on every order
Speed	Fast shipping — quick dispatch
Availability
Status	Coming Soon — in development
Delivery	To be announced
Price	To be announced

Printed Frame Kit

All structural airframe components, printed in durable PA612-CF nylon and ready to assemble.

Heat Inserts Pre-Installed

Every threaded heat insert is already installed — no melting or prep required before assembly.

Assembly Hardware

All bolts necessary for assembly are included in the box — no extra sourcing needed.

Battery Strap Included

Battery strap in the box. Supports 850–1400mAh packs for roughly 8–12 minutes of flight.

Analog FPV Ready

Set up for analog FPV with a 19×19mm camera. Comes ready to install your electronics.

Confined-Space Geometry

Compact 3.5" frame geometry engineered for navigation through doorways, hallways, and interior structures.

Component	Default Configuration	Notes
Flight Controller	20×20 AIO	All-in-one stack, 20×20mm mounting
VTX	Mini-style VTX	Analog video transmitter
Motors	1804 2450KV	4× — sized for the 3.5" prop class
Camera	19×19 Analog FPV Camera	Analog FPV system
Receiver	ELRS / Crossfire	Receiver & antenna
Battery	850–1400mAh LiPo	Battery strap included · 8–12 min flight
Frame	PA612-CF Nylon	Heat inserts pre-installed · assembly hardware included

⚠ Ready to Install Electronics The QR-31 ships as a frame kit with all heat inserts pre-installed and the bolts needed for assembly included — set up for analog FPV with a 19×19mm camera. Electronics are not included. The configuration above is the recommended default; final specifications will be confirmed at launch. Join the waitlist for the complete build guide.

Design Intent

Who This Is For

Power & Flight

Built for the Spaces Others Can't Reach