RRC4 FLIGHT COMPUTER

Connect on the rail.
No app required.

The RRC4 runs on webBLE — navigate to a web page and you're connected. No app store, no install. mDACS Web works on PC, Mac, Android, iPhone and iPad, online or completely offline.

See it connect ↓ View specs

Searching for RRC4…

SCROLL

ONE APP. EVERY DEVICE.

Your browser is the control console.

mDACS Web is device-agnostic by design. Whatever's already in your hand on the launch rail is what you use — no matter where, when, or what device.

RRC4 · webBLE

PC / Mac

Android

iPhone

iPad

Chrome Edge Opera Samsung Internet Internet Explorer Bluefy — iPhone & iPad

TWO WAYS IN

Online at the shop. Offline at the range.

Cell service at the launch site is never guaranteed. mDACS comes in two versions, both free to use, so that's never a problem.

mDACS Web

Run it live

The version to use whenever you've got an active web connection — always current, always the latest release.

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mDACS Cache

Bookmark it once

Load and bookmark this version before you leave the house. It runs completely offline — built for the launch rail, not the coffee shop.

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THE INTERFACE

Summary → Charts → Setup → Launch

Real screens from mDACS Web — flight review, event configuration, and launch-rail readiness, all in the same browser tab.

Summary

Charts

Setup

Launch

BEYOND THE SUMMARY

Every sample, exportable for analysis.

Every flight is logged at high rate to onboard flash — data captured and distilled to 20Hz for the full flight duration. Pull it over USB as CSV and drop it into the included spreadsheet template — instant dashboards, or start from the raw per-sample data and build your own analysis.

Flight Summary Data

Flight Performance Charts

Data Import Table

Flight summary dashboard — inertial max/min, velocity derivations, descent rates, AGL breakdown, phase timing

Barometric and inertial velocity chart with event markers

FOR ADVANCED FLIERS

Eight trigger types. Four Outputs.
Two Custom Comparators.

Any deployment logic or flight control scenario you can dream up, you can probably build with what's already on board.

All 4 output channels fire independently
Adjustable Trigger Criteria provide comprehensive event controls
Stack two comparators together and interpose timer gating before or after the condition

$ rrc4 trace --events [00:11.4] Baro-AGL GT > 500 → TRUE [00:11.4] Accel-Vel LT < -12.4 → FALSE [00:12.9] Custom1 AND Custom2 → TRUE [00:12.9] Drogue FIRE — Custom AND satisfied [00:12.9] Comp → Timer 0.8s ARMED [00:13.7] Timer elapsed → FIRE [00:31.2] Descent AGL = 800 → ARMED [00:44.0] Baro-Vel GE >= 18.0 → TRUE [00:44.0] Main FIRE — Custom2 satisfied [00:44.1] Aux1 idle — Comp-Only, not armed [01:02.6] Landing → TRUE [01:02.6] Flight complete $ rrc4 trace --events [00:11.4] Baro-AGL GT > 500 → TRUE [00:11.4] Accel-Vel LT < -12.4 → FALSE [00:12.9] Custom1 AND Custom2 → TRUE [00:12.9] Drogue FIRE — Custom AND satisfied [00:12.9] Comp → Timer 0.8s ARMED [00:13.7] Timer elapsed → FIRE [00:31.2] Descent AGL = 800 → ARMED [00:44.0] Baro-Vel GE >= 18.0 → TRUE [00:44.0] Main FIRE — Custom2 satisfied [00:44.1] Aux1 idle — Comp-Only, not armed [01:02.6] Landing → TRUE [01:02.6] Flight complete

System Events

Breakwire Clock Boost Coast Apogee Descent Landing Custom Comparator

Comparator PVs

Baro-AGL Accel-AGL Vert-G Baro-Vel Accel-Vel Rota-G Stage#

UNDER THE HOOD

Feather & Wing, built for flight.

The RRC4 follows Adafruit's Feather/Wing convention — a Particle Photon 2 as the brains, a purpose-built Wing board handling every sensor and pyro channel.

Controller Particle Photon 2 — dual-CPU, WiFi + BLE

Inertial sensing ADXL375 — ±200G, 3-axis

Barometric sensing MS5607 — 10–1200 mbar, 24-bit

Event outputs 4 × IntelliFET — 2.8A nom / 8A peak

Flash storage 2 MB — up to 100 flight files

Battery 1S Lithium, 4.2V max, integral charger

Serial I/O 3V3 UART, 9600–115200 bps

Connectivity Bluetooth BLE + 2.4/5G WiFi

Full specifications, dimensional drawings, and CLI reference are in the RRC4 User Manual.

'Io — the RRC4 mark, a Hawaiian hawk in a rocket dive

THE MARK

Named for 'Io — pronounced EEE-OH

The indigenous Hawaiian hawk. A symbol of royalty through lofty flight, and considered an 'aumakua — a personal guardian. Missile Works is headquartered on Hawaii Island, home to this raptor. Consider 'Io your own rocket guardian.

WATCH IT WORK