Breakover angle or rampover angle is the maximum possible supplementary angle (usually expressed in degrees) that a vehicle, with at least one forward wheel and one rear wheel, can drive over without the apex of that angle touching any point of the vehicle other than the wheels.[1][2][3] This definition is contingent upon the wheels being in continuous contact with the supporting surface(s). Breakover angle differs from ground clearance, which is the shortest distance between the ground and lowest point on the vehicle.
β° = Breakover angle; C = Underside of chassis; W = Wheel; G = Ground; M = Midpoint of wheelbaseExample of a vehicle at a significant breakover angle.
If a vehicle drives over a breakover angle larger than what it is capable of clearing, the vehicle will contact the apex of the angle, which will quite likely prevent the vehicle from continuing any further in its direction of travel, possibly even completely immobilizing the vehicle.
Calculation
Assuming no tire deflection, and assuming an ideal breakover angle scenario (two flat surfaces coming to a point, a vehicle with the lowest point of the chassis located at its midsection, etc.), an approximation for the breakover angle of a vehicle can be calculated as follows:
^Division of the Federal Register, United States: The Code of Federal Regulations of the United States of America, page 447. U.S. Government Printing Office, 1979. ISSN 1946-4975
^SAE J689: Cancelled AUG 2009 Curbstone Clearance, Approach, Departure, and Ramp Breakover Angles--Passenger Car and Light Truck
breakover, angle, rampover, angle, maximum, possible, supplementary, angle, usually, expressed, degrees, that, vehicle, with, least, forward, wheel, rear, wheel, drive, over, without, apex, that, angle, touching, point, vehicle, other, than, wheels, this, defi. Breakover angle or rampover angle is the maximum possible supplementary angle usually expressed in degrees that a vehicle with at least one forward wheel and one rear wheel can drive over without the apex of that angle touching any point of the vehicle other than the wheels 1 2 3 This definition is contingent upon the wheels being in continuous contact with the supporting surface s Breakover angle differs from ground clearance which is the shortest distance between the ground and lowest point on the vehicle b Breakover angle C Underside of chassis W Wheel G Ground M Midpoint of wheelbaseExample of a vehicle at a significant breakover angle Contents 1 Relevance 2 Calculation 3 See also 4 References 5 External linksRelevance Edit MUTCD warning sign for a low ground clearance crossingBreakover angle is a relevant performance metric in many common vehicle scenarios including Off roading Loading a vehicle onto a higher surface with a ramp Going over raised railroad crossings Going over speed bumps Going over linkspans and ferry slipsIf a vehicle drives over a breakover angle larger than what it is capable of clearing the vehicle will contact the apex of the angle which will quite likely prevent the vehicle from continuing any further in its direction of travel possibly even completely immobilizing the vehicle Calculation EditAssuming no tire deflection and assuming an ideal breakover angle scenario two flat surfaces coming to a point a vehicle with the lowest point of the chassis located at its midsection etc an approximation for the breakover angle of a vehicle can be calculated as follows breakover angle a p p r o x i m a t e 2 arctan 2 ground clearance wheelbase displaystyle text breakover angle approximate 2 cdot arctan left frac 2 cdot text ground clearance text wheelbase right See also EditApproach and departure angles Glossary of road transport terms Overhang automotive Ride height Vertical railway curvesReferences Edit Division of the Federal Register United States The Code of Federal Regulations of the United States of America page 447 U S Government Printing Office 1979 ISSN 1946 4975 SAE J689 Cancelled AUG 2009 Curbstone Clearance Approach Departure and Ramp Breakover Angles Passenger Car and Light Truck SAE J1100 NOV 2009 Motor Vehicle DimensionsExternal links EditHowStuffWorks The Physics of Off Roading Retrieved from https en wikipedia org w index php title Breakover angle amp oldid 1155286764, wikipedia, wiki, book, books, library,
