Dozer Ripper Loosening Production Rate
Bank cubic yards per hour a dozer ripper loosens in place from the shank spacing, penetration.
Example
You enter
- Shank spacing / pass width (ft) 3
- Ripping depth (ft) 1.5
- Ripping speed (ft/min) 132
- Job efficiency 0.75
You get
- Ripped cross-section 4.5 ft^2
- Loosened production 990 bank cy/hr
Checked against published worked examples from: Caterpillar.
Details, formula, and sources
ScopeBank cubic yards per hour a dozer ripper loosens in place from the shank spacing, penetration, and speed - the loosening step that feeds the push, load, and haul spread. Ripping fractures rock and hardpan; it does not move it. The operator judges rippability.
Formula or tablecross_section_ft2 = spacing_ft x penetration_ft; production_bcy_hr = cross_section_ft2 x speed_fpm x 60 x efficiency / 27 (60 min/hr, 27 ft^3/cy fold the units); with a pass length and turn time (Cat timing method): production = (cross_section_ft2 x pass_length / 27) x 60 / (pass_length / speed + turn) x efficiency.
Source and editionSwept-prism production identity by name (loosened volume = ripped cross-section x travel rate); first-principles unit-folding arithmetic.
Free accessThe swept-prism production identity is published earthmoving practice; the 60 and 27 unit constants are exact.
What governsEstimate. AHJ and licensed professional govern.
API field namesspacing_ft, penetration_ft, speed_fpm, efficiency, cross_section_ft2, production_bcy_hr
- Efficiency 0.75 job efficiency (default; overlap, tooth wear, real-world delays)earthmoving practice
- Unit constants 60 min/hr and 27 ft^3/cy (exact)physical fact