Rocket launcher from the Tactical Flava mod
BM-21 Grad Calculator for Arma Reforger
The BM-21 Grad comes to Arma Reforger with the Tactical Flava mod, and it is aimed differently from a gun: there is no charge to pick, the rocket is always the same, and range is shortened by fitting brake rings. Reforger FDC picks the ring setting, returns azimuth on the 6000 mil scale, elevation and time of flight.
- Operator setting
- Large brake ring
- Azimuth
- 2065 mil
- Elevation setting
- 454 mil
- Time of flight
- 17.6 s
A solution computed by the app, not an example: Everon, gun at X4922 Y4868 and 89 m, target at X8000 Y2800 and 356 m, 9M22 HE rocket. Range 3708 m, height difference +267 m applied, 6000 mils per circle. The same geometry as on the M777 page, so the two can be compared.
What the data pack holds
- Mod
- Tactical Flava - BM-21 1.6.3, by KERNOV
- Rockets
- 9M22 HE, 9M43 smoke, 3M16 and 9M28K cluster
- Operator setting
- no brake ring, small ring, large ring
- Ranges
- 9M22 HE: 4600–16 800 m without rings, 2400–8200 m small ring, 1600–5200 m large ring; cluster rockets from 1400 m
- Trajectory
- one rising arc: elevation grows with range
- Angular unit
- 6000 mils
- Corrections
- height applied, wind switched off
- Dispersion
- 100 m mean, as printed on the board
- Source
- the mod's own in-game "Ballistic Manual" board, twenty pages read on 2026-09-01; all twelve tables checked in game on 1.6.3, 293 rows of 299 within two mils
What the calculator computes for the Grad
From the launcher and target positions it takes range and azimuth, walks the three ring settings for the selected rocket, and returns elevation and time of flight for every setting that reaches. The settings overlap widely: a target at four kilometres is inside both the small and the large ring table. The large ring flies higher and slower, so the rocket comes down more steeply; the small ring is flatter and arrives sooner. Both solutions stay on screen, the recommended one first.
A brake ring works the other way from a mortar ring. On the M252 more rings means more propellant and more range. On the Grad a ring adds drag, so the bigger the ring, the shorter the flight. The application keeps the two apart and labels the Grad setting as a brake ring rather than a charge.
The height difference between launcher and target is read from the map terrain and applied to the elevation. It was measured for the Grad in game on 2 September 2026 with a controlled series, the fifth weapon to pass that test. The usual refusal below five degrees of fall never triggers here: the Grad tables begin where the rocket already falls at 7.6 degrees.
Things that catch people out
- The 6000 mil scale. An azimuth from a calculator working in 6400 is wrong on the Grad, and the gap grows with the azimuth.
- Nothing closer than 1400 metres. Even the large ring cannot bring a cluster rocket nearer, and the HE rocket starts at 1600.
- Smoke does not reach as close as HE without rings: the 9M43 table starts at 4800 metres, not 4600.
Data and rights
The numbers are read from the Grad's own in-game board, not unpacked from mod files. The mod is published under the Arma Public License No Derivatives, which requires attribution; the author was not asked and gave no separate permission, and the pack is limited to credited readings of that board. All twelve tables were checked in game against the engine's own trajectory prediction, the ring tables included: the mod gives each ring its own rocket. The prediction stops at ten kilometres, so beyond that the 9M22 and 9M43 without rings rest on the author's board alone.
How to open the Grad in the application
- Open Reforger FDC with the Grad already selected and choose the map workflow or the coordinate one.
- Check that the weapon block shows the BM-21 Grad (Tactical Flava), then pick the rocket.
- Place the launcher point and the target point; heights come from the terrain.
- Read the ring setting, azimuth, elevation and time of flight.