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How to run the workbench

  1. 01Overview
  2. 02Examples
  3. 03Setup
  4. 04Physics
  5. 05Engagement
  6. 06Target
  7. 07Catalogue
  8. 08Compare
  9. 09TDP

Operator manual for the workbench. Every inner tab is below, with a screenshot taken from the instrument. The worked example is an 80 mm example HE cylinder created on Payload Setup. The comparison baseline is the locked M67 grenade on Examples. Catalogue rows are class examples you calibrate, not fielded systems.

Read the status chip on every screen: payload name, Gurney V, standoff, TNT-equivalent, nose mechanism, and pose. Physics, Engagement, Target, Catalogue, Compare, and the Technical Data Package all read that chip. Lab (reset, import, regression) stays folded on Overview; it is not the operator path.

Access is restricted. Named U.S. Person seats, and eligible foreign persons only through an organization under a U.S. government approval. See Access Eligibility. Output is an engineering estimate, not a certified JMEM and not a range-safety determination. Range clearance stays with the certifying authority.

Before the instrument

  1. Email for a seat
  2. Approval
  3. Workbench
  4. Save

Email for a seat, complete screening, complete the video identity check, wait for a written memo. After approval, open Workbench. Workbench is $20,000 / year. The Technical Data Package add-on is $5,000 / year and unlocks the ZIP plus Compare. Invoice after the named seat is approved. There is no card checkout.

01 Overview

Read the map before you change a number.

Overview is the table of contents: Setup, Physics, Engagement, Target, Catalogue, Compare, and the Technical Data Package. Each card opens that inner tab. Provenance under the cards names the method: Gurney, Kinney–Graham, THOR, Forrestal / Tate, P–i, fly-out MSD, RED / CDE. Lab stays folded.

Workbench Overview tab with cards for every inner tab
Overview · inner-tab map. Click a card to open that tab
Overview cards for parametric study, height of burst, catalogue, Compare, and the Technical Data Package
Overview · Target, Catalogue, Compare, and the Technical Data Package
Overview provenance table naming each model and worksheet
Overview · Models & provenance. Open-literature methods, not a certified JMEM

02 Examples

Load a locked benchmark, then leave it locked.

Four published-band checks stay in the workbench: 155 mm M107, 120 mm HE mortar, Mk 82 500-lb GP bomb, and M67 grenade. The envelope table must match the article the example is built from. The performance table is workbench versus a published number — Gurney, blast, area of effect, plate perforation — where one exists. Matching the envelope only proves the geometry solve reads the article. The same checks are public at Benchmarks.

  1. 01Open Examples. Scroll to M67 fragmentation grenade.
  2. 02Read envelope (inputs) then performance (workbench vs published).
  3. 03Press Load this example if the status chip is not already M67. Geometry stays locked.
  4. 04Keep M67 as the comparison round. The 80 mm example HE is a separate payload you create next.
Examples tab showing M67 grenade published versus workbench checks
Examples · M67 envelope and performance. Status chip shows the locked grenade

03 Setup

Describe the round the rest of the tool will read.

Materials is the live library: structural target metals and explosive fills. Edit a cell and every tab that uses that name updates. You rarely need it unless you are adding a fill.

Payload Setup is the round. Charge, case, fragment treatment, nose, and standoff. Derived source terms (C, M, Gurney V, TNT equivalent, fragment count) update as you type.

  1. 01Payload Setup → New. Name it 80 mm example HE.
  2. 02Cylinder, diameter 3.15 in (80 mm), length about 10 in, case 0.2 in, Comp B, steel, Mott natural fragments, metal fraction 0.55.
  3. 03Fixed standoff 8 m so later tabs share a clean range without CEP growth.
  4. 04Leave nose as fragmenting end cap unless you are running EFP / SC or an ogive projectile.
  5. 05Confirm the status chip reads 80 mm example HE before leaving the tab.
Materials library with structural metals and explosive fills
Materials · structural targets and fills. The 80 mm example HE uses Comp B and steel from this list
Payload Setup for an 80 mm example HE cylinder
Payload Setup · 80 mm example HE. Derived source terms on the right

04 Physics

Score each mechanism on the active payload.

Physics tabs read the status chip. Gurney, Blast, and THOR always have something to say for this cylinder. EFP / SC and Projectile Pen stay quiet until the nose calls for them. Structural and Local blast are P–i reads against a surrogate shell or bay.

Gurney

Launch velocity from C/M and the shell family you set. For a cylinder that is Lloyd with Huang rarefaction along the wall. The yellow marker is this payload. Sliders explore D, L, and √2E without writing back to Setup until you intend to.

Gurney tab for the 80 mm example HE
Gurney · cylinder family. Marker is the 80 mm example HE at its solved M/C

Blast

Kinney–Graham overpressure and impulse versus scaled distance Z. Kingery–Bulmash is the dashed check. Ground burst applies the 1.8 W hemispherical factor. The marker is Z at the payload standoff.

Blast tab Kinney–Graham curves for the 80 mm example HE
Blast · incident and reflected overpressure vs Z. Same payload, 8 m standoff

THOR

Fragment residual velocity and mass after a plate. Plate metal and thickness default from the Effects surrogate. Strike V at range uses the same drag ODE as Fly-out.

THOR fragment penetration tab
THOR · residual velocity vs strike velocity for the surrogate plate

EFP / SC and Projectile Pen

EFP / SC opens when Nose mechanism is an EFP slug or a shaped-charge jet. Projectile Pen opens for an ogive. The 80 mm example HE starts as a flat-plate end cap, so those tabs stay quiet until you change the nose. Set Nose to EFP slug to get the hydrodynamic depth chart below. Load 155 mm M107 for the Forrestal / Tate ogive chart.

EFP / shaped charge tab while the 80 mm example HE has no liner
EFP / SC · 80 mm example HE with Nose set to EFP slug. Switch back to Flat plate for the rest of this walkthrough
Projectile penetration tab on the locked 155 mm M107 ogive
Projectile Pen · 155 mm M107 ogive, Forrestal then eroding hydro

Structural and Local blast

Structural is the rupture hyperbola for a surrogate shell (P–i). Local blast is the parallel bay / face / joint path. Both overlay the Kinney load at the payload standoff. Switch the status chip back to 80 mm example HE after the M107 ogive shot.

Structural P–i tab for the 80 mm example HE
Structural · rupture hyperbola and Kinney locus at the shared standoff
Local blast tab for bay and face-sheet damage
Local blast · bay / face / joint path, parallel to the structural shell

05 Engagement

Put the same round in the air.

Soft Effects, Fly-out, hazard distances, and Effects share the payload pose (yaw / pitch / roll / height) except where a tab says otherwise. Fly-out is a static range burst. Incoming platform speed is Strike V on Target, not a hidden add-on here.

Soft Effects

Incident overpressure versus range against open injury thresholds (glass, eardrum, lung, lethality). The vertical marker is the payload standoff. Sync R and W from the active payload if you have been exploring.

Soft Effects tab with blast injury thresholds
Soft Effects · Kinney Ps vs open injury table at 8 m

Fly-out

Integrates the fragment inventory with quadratic drag, Mach Cd, and gravity. Elevation is ground range versus height. Wheel or +/− zooms, drag pans, double-click or 1:1 resets. Hazardous traces are KE ≥ 79 J. MSD is the p90 of those impacts. Reload launch from payload if you edited Gurney or Taylor angle.

Fly-out elevation plot for the 80 mm example HE
Fly-out · elevation traces, MSD / RED / CDE lines, pose sliders on the right

Hazard distances

The JFIRE tab draws RED- and MSD-style rings computed from this payload — engineering estimates, not table values from a publication. Danger close is a call-for-fire warning, not a distance. CDE is the furthest-reaching mechanism. You can download a KMZ for Google Earth; range clearance is still the certifying authority’s.

Hazard-distance plan with RED and MSD rings
Hazard distances · RED / MSD / CDE from this payload, not a published table

Effects

3-D burst scene. Place boxes, cylinders, spheres; drive standoff from the 3-D pose if the box is ticked. Overlays include Taylor band, fragment hits, soft R, and RED / MSD. This pose is not the Compare attitude.

Effects 3-D burst scene for the 80 mm example HE
Effects · arena plate at 8 m, fragment spray and aim axis

06 Target

Aim at a class example, then sweep the look.

Solid model is a BRL-CAD-shaped class at true size. Parametric study holds range and Strike V and sweeps aspect × elevation. Height of burst holds the approach and sweeps burst range × CEP. Pd is an engineering estimate — not AJEM, not a certified Pk. Strike V on these tabs is added along the look; Fly-out stays a static burst.

  1. 01Solid model: pick a class (light truck, shelter, small boat, …). Orbit the solid.
  2. 02Parametric study: set Range R and Strike V. Press Run study. Read the Pd surface.
  3. 03Height of burst: set aspect and elevation. Press Run study. Read Pd versus burst range.
  4. 04Do not treat a class name as a fielded airframe.
Target solid model of a light truck class example
Solid model · light truck class example, not a named system
Parametric study Pd surface versus aspect and elevation
Parametric study · Run study draws Pd versus aspect and elevation
Height of burst Pd versus range and CEP
Height of burst · Run study draws Pd versus burst range and CEP

07 Catalogue

The same round against every class example.

Catalogue sweeps the active payload across ten class examples, plus any row you add. Scroll the table. Dominance is the mechanism with the lowest platform-count. Add a row when a range or a platform shop needs its own surrogate in the same solve. Restore built-ins if an edit went wrong.

Catalogue tab listing class-example targets
Catalogue · class examples you calibrate. Active payload is 80 mm example HE

08 Compare

80 mm example HE against the M67.

Compare is part of the Technical Data Package add-on. Left is the selected payload and changes the rest of the workbench. Right is review-only. Shared standoff R is for blast / structural / soft takeaways. Fly-out and RED / MSD use each payload’s own launch.

  1. 01Left: 80 mm example HE. Right: M67 fragmentation grenade (example).
  2. 02Set Compare at R if you want a common blast range that is not either native standoff.
  3. 03Read Gurney, Blast, THOR, then scroll to Fly-out.
  4. 04On the elevation twins: wheel or +/− to zoom, drag to pan, 1:1 or double-click to reset. Both plots share the window.
  5. 05Hazard-distance plans sit on a shared axis. Single Target engagement is one parametric shot at a pose you set here — not the Effects pose.
Compare tab with 80 mm example HE selected against M67
Compare · selectors and Gurney overlay. Left writes Setup; right does not
Compare blast overlay of the 80 mm example HE and M67
Compare · Blast. Kinney loci for both payloads at the shared R
Compare fly-out elevation and plan for both payloads
Compare · Fly-out twins. Wheel or +/− zooms both; drag pans; 1:1 resets
Compare hazard-distance plans for both payloads
Compare · RED- and MSD-style plans on a shared span
Compare single Target engagement for both payloads
Compare · one Target shot at the shared engagement pose

09 Technical Data Package

Download the pack for the active payload.

One ZIP: geometry and drawings, watertight centimetre STLs, JTCG/ME ZDATA, blast, penetration, RED- and MSD-style hazard distances computed from this payload, the class solid, Target Pd studies, and a physics report. Watermarked with the signed-in account. Disclaimer on the cover. An evaluation term does not include it. Gate and price are on Pricing.

Technical Data Package tab for the 80 mm example HE
Technical Data Package · envelope chips and ZIP download for 80 mm example HE

SaveNamed snapshot of the whole workbench (payloads, surrogate, scene, catalogue edits). Opens from Setups on the dashboard.

Report a bugBottom right. Sends page, browser, and console. A workbench snapshot only if you tick the box.

LimitsDisclaimer · Sources

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