SUPREME CORPORATION Download PDF Report
Supreme Corp. submitted a model Ford Senator, gasoline-powered 13 seat (including the driver) 23-foot bus, for a partial STURAA test in the 7 yr/200,000 mile category. The test bus is built on a Ford F-450 chassis. The odometer reading at the time of delivery was 595.0 miles. The Federal Transit Administration determined that the following test would be performed: 1.1 Accessibility of Components & Subsystems, 1.3 R/R of Selected Subsystems, 3. Safety, 4.1 Performance Test, 4.2 Brake Test, 6. Fuel Economy Test, 7.1 Interior Noise Tests, 7.2 Exterior Noise Tests and 8. Emissions. Testing started on March 11, 2011 and was completed on April 18, 2011. The Check-In section of the report provides a description of the bus and specifies its major components.
The interior of the bus is configured with seating for 13 passengers including the driver plus 2 wheelchair positions. Free floor space will accommodate 8 standing passengers resulting in a potential load of 21 persons plus 2 wheelchair positions. At 150 lbs per person and 600 lbs per wheelchair position, this load results in a measured Gross Vehicle Weight (GVW) of 13,420 lbs. Note: at Gross Vehicle Load ( GVL) the weight of the rear axle is 310 lbs over the rear GAWR.
Effective January 1, 2010 the Federal Transit Administration determined that the total number of simulated passengers used for loading all test vehicles will be based on the full complement of seats and free-floor space available for standing passengers (150 lbs per passenger). The passenger loading used for dynamic testing will not be reduced in order to comply with Gross Axle Weight Ratings (GAWR’s) or the Gross Vehicle Weight Ratings (GVWR’s) declared by the manufacturer. Cases where the loading exceeds the GAWR and/or the GVWR will be noted accordingly. During the testing program, all test vehicles transported or operated over public roadways will be loaded to comply with the GAWR and GVWR specified by the manufacturer.
Accessibility, in general, was adequate, components covered in Section 1.3 (Repair and/or Replacement of Selected Subsystems) along with all other components encountered during testing, were found to be readily accessible and no restrictions were noted.
The Safety Test, (a double-lane change, obstacle avoidance test) was safely performed in both right-hand and left-hand directions up to a maximum test speed of 45 mph. The performance of the bus is illustrated by a speed vs. time plot. Acceleration and gradeability test data are provided in Section 4, Performance. The average time to obtain 50 mph was 15.27 seconds. The Stopping Distance phase of the Brake Test was completed with the following results; for the Uniform High Friction Test average stopping distances were 27.47’ at 20 mph, 54.93’ at 30 mph, 100.52’ at 40 mph and 127.61’ at 45 mph. The average stopping distance for the Uniform Low Friction Test was 27.39’. There was no deviation from the test lane during the performance of the Stopping Distance phase. During the Stability phase of Brake Testing the test bus experienced no deviation from the test lane but did experience pull to the left during both approaches to the Split Friction Road surface. The Parking Brake phase was completed with the test bus maintaining the parked position for the full five minute period with no slip or roll observed in both the uphill and downhill positions.
A Fuel Economy Test was run on simulated central business district, arterial, and commuter courses. The results were 6.55 mpg, 6.54 mpg, and 10.31 mpg respectively; with an overall average of 7.31 mpg.
A series of Interior and Exterior Noise Tests was performed. These data are listed in Section 7.1 and 7.2 respectively. Emissions Testing was performed. These data are listed in Section 8.