Module on_demand 

One motor found by name on ThrustCurve.org, with the curve file to fly it by: for a simulator that lacks the motor’s curve (M4.5b, motors on demand; ADR-154, the decision on fetching them).

find asks ThrustCurve’s search for the name as a designation (F27R/L), then, if no motor has that designation, as a common name (F27), each time with the manufacturer when one is given. Exactly one solid motor must answer: two or more are FindError::Ambiguous, listed by maker and designation so the caller can say which, and a hybrid is refused, as hpr flies commercial solid motors only. It then downloads the motor’s RASP (.eng) files and takes the first that reads as one motor, ranked by who measured it (rank): a certification test, then the manufacturer, then a user, then a file that names no source, in the answer’s order within each. With no RASP file that reads, it does the same with the RockSim (.rse) files. A file the caller names (Wanted::prefer) goes ahead of that order when it reads, the RockSim files read too when the RASP ones lack it (offline with no copy of them, the RASP files are taken as if none were named). find_with takes the caller’s own reading of a file instead, so the file taken is the first the caller can use: a simulator that builds a motor from the file’s masses refuses more than hpr_motor’s reader does.

Every answer goes through the Client, so it is cached (crate::thrustcurve::TTL_S, a day) and, offline, read from the cache alone: a motor found once is found again with no network. Nothing is bundled: ThrustCurve states no license for its records, and each file carries its own (DataFile::license), which the caller shows.

How far to trust it: the curve is the file a contributor uploaded, as ThrustCurve serves it; which file is taken is the rule above, not a judgement of which is right. A name is matched as ThrustCurve’s search matches it (on 2026-10-04, a designation exactly but for case), so a name ThrustCurve spells differently is not found rather than wrongly matched.

Structs

Found

A motor found, with the file to fly it by.

Wanted

The motor to find: a designation or common name, and its manufacturer if known.

Enums

FindError

Why no motor was found.

Functions

find

Finds wanted on ThrustCurve.org through client, and the file to fly it by, as the module says: the first file that reads_as_one_motor.

find_with

As find, with build reading a file instead: the file taken is the first, in find’s order, that build turns into an M, returned with it. build’s refusal of the last file tried is FindError::NoFile’s reason.

rank

Where a data file’s source puts it in find’s order: cert (a certification test) 0, mfr (the manufacturer) 1, user 2, anything else or none 3.

reads_as_one_motor

Whether a data file reads as exactly one motor’s curve with hpr_motor’s reader: find’s test of a file.