Spud-Gun Lab — Standard-PVC Max-Range Build (In-Cylinder CFD)

Crank

0°

Mean P

1.0 bar

Mean T

300 K

Slow-mo

–

solver on worker thread

Launch lab — where would it fly?

Projectile

Launch angle 45°

Barrel on the tube exit (Open-tube mode) none — free jet

Controls (live)

Configuration

Spark position — across bore 50%

Spark position — head → piston/exit 6%

Second spark plug (fires simultaneously)

Plug 2 — across bore 96%

Plug 2 — head → piston/exit 50%

Exit opening (tube mode) 100% of bore

Engine speed 1500 rpm

Spark advance 20° BTDC

Throttle (manifold pressure) 100%

Turbulent mixing / flame speed ×1.0

Fuel

Solver setup (applies on Reset)

Grid resolution

Compression ratio 8.5 : 1

Bore (width) 86 mm

Stroke (travel / tube length) 86 mm

Head shape (carved into the head)

Piston crown / tube end wall

Settings auto-save in this browser and restore on refresh. “Bake” downloads a copy of the app with the current settings built in as its defaults.

Indicator diagram (p–V), live

Peak pressure–

Peak temperature–

Work / cycle–

IMEP–

Indicated power–

η indicated–

Torque (indicated)–

Mean piston speed–

Peak exhaust velocity–

Burn 10–90%–

Knock integral–

Launches (45°, still air)–