Muster

Motor-hardware compatibility for high-power rocketry, at muster.fusionspace.co.

Reloadable motor hardware is a graph, and it's easy to get lost in it: a case fits some reloads directly and others only with spacers, each reload needs the right closures, and a few need a seal disc or a plugged closure. Muster makes that graph interactive across AeroTech RMS, Cesaroni Pro, and Loki Research. Tell it a case you own and it shows every reload it can fly — directly or with spacers — each reload's certification, and the complete list of reusable hardware to buy. Or start from a reload and it works back to the cases and hardware that fly it.

Muster is a shopping aid, not an assembly guide. The reload's own printed instructions are always the authority on the hardware it needs — build to them, and confirm every part with the manufacturer before you buy or fly.

Part of Fusion Space — free, polished tools for high-power rocketry. See also the HPR Motor Finder, Charge, and Window.

What it does

The page works in two directions, chosen with one toggle:

• I have a case — pick a case you own and see every reload it flies. Reloads built for the case are direct fits; a longer case also flies shorter reloads as spacer fits, grouped by how many spacers they need. Each reload shows its total impulse, average thrust, propellant, delays, certifying body, and flags for plugged (no ejection charge) and sparky propellant.
• I have a reload — search by designation, class, or propellant and see the cases that fly it: its own case, plus any longer case that reaches it with the adapter and spacers.

Either way, picking a result builds the shopping list: the reusable hardware to own once (case, forward and aft closures, a seal disc on the longer cases, the adapter for a spacer fit) separated from the single-use reload to buy, with the part numbers and a plain-text copy for a club chat or an order. Conservative notes flag a plugged reload, a sparky propellant, an out-of-production reload, and every spacer fit.

A companion kit planner turns the same graph on your own hardware: check off the cases and adapters you own and it counts every reload your kit already flies, then ranks the single purchase that unlocks the most more — and it won't suggest a case whose reloads you can already reach with a spacer. Your kit stays on the device, nothing uploaded.

Scope today is AeroTech RMS (24–98 mm), Cesaroni Pro (24–98 mm), and Loki Research (38–76 mm) — the systems most high-power flyers actually own. Choose the system with one toggle; the hardware doesn't interchange across brands, and Muster won't invent a cross-brand fit — with one sourced exception the manufacturers publish: at 75 mm and 98 mm, AeroTech RMS and Cesaroni Pro are cross-compatible ("crossloads"), shown as a distinct caution with each maker's conditions, never a resolved fit. Spacer fits are resolved where the manufacturer publishes the rule (AeroTech 38 mm, Cesaroni Pro29/38/54) and flagged as an advisory elsewhere; Loki publishes no spacer system, so its reloads are direct-fit only.

• Certification as a dimension, not a checkbox — each reload carries its certifying body (NAR / Tripoli) or a caution when none is listed, and out-of-production is shown as its own status, never conflated with decertified.
• Every fit is typed — direct vs. spacer, and how many spacers, never a bare yes/no.
• Sourced end to end — the reload catalog is mirrored from ThrustCurve; the hardware graph (cases, closures, seal-disc rules, the 38RAS spacer chart) is curated by hand from the manufacturer's published hardware, and every part and rule cites its source in the repo.
• Shareable — the whole selection lives in the URL, so a resolved view is a link.
• A page for every case and reload — each has its own static, deep-linkable page (/case/…, /reload/…) with the reloads or cases it works with, cross-linked and in the sitemap, so it's findable in search and shareable on its own — each leading back into the interactive tool.
• Private by default — everything runs in your browser. No account, no server, no analytics or tracking of any kind.
• Installable, and works offline once loaded — the whole dataset ships with the page, so it works at a remote field or a vendor's booth with no signal.

How the data works

Two halves meet in a small resolver:

• The reload catalog — designations, impulse, thrust, delays, propellant, and certification — is a static mirror of ThrustCurve (lib/data/reloads.json), and the reload → case mapping is ThrustCurve's own per-motor case field.
• The hardware graph — cases, closures, seal-disc rules, and spacer rules — is curated by hand: lib/data/hardware.ts for AeroTech RMS, lib/data/hardware-cti.ts for Cesaroni Pro, and lib/data/hardware-loki.ts for Loki Research, with a source on every node. Cases, closures, and adapters all carry their manufacturer, and a reload only ever resolves to another brand's hardware through the manufacturers' published 75/98 mm crossloads (lib/data/crossload.ts), shown as a caution.

Spacer compatibility is resolved only where the manufacturer publishes the rule — AeroTech 38 mm (its full spacer chart) and Cesaroni Pro29/38/54 (up to two spacers, one or two grain sizes shorter). Everywhere else it's a sourced advisory rather than a fabricated step; Loki Research publishes no spacer system, so its reloads are modeled direct-fit only. The resolver (lib/resolve.ts) is pure and tested, and the graph is checked against a safety contract (lib/validate.ts) on every build: a dangling reference, a spacer rule that steps the wrong way (a longer reload into a shorter case), a source-less part, or a plugged reload that still claims an ejection charge all fail next build, because a wrong edge here is a safety problem, not a typo.

Running locally

Static site built with Next.js and Tailwind, exported to plain HTML/CSS/JS. Everything runs in the browser; there is no backend.

npm install
npm run dev      # local dev server
npm run build    # static export to ./out
npm test         # run the unit tests
npm run lint     # lint

Deploying

Hosted on Cloudflare Pages as a fully static site. Build command npm run build, output directory out. No Functions, no server-side code.

Disclaimer

Personal, non-commercial project — not affiliated with any rocketry vendor, manufacturer, or certification organization. Built for the hobby rocketry community.

License

Released under the MIT License — fork it, modify it, deploy your own copy, no attribution required.