ALLSTAR 25 (CNG)

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Normal Starcraft Bus, a Division of Forest River, Inc. submitted a model Allstar 25 (cng), CNG-powered 21 seat/26-foot bus, built on a Ford E-450 chassis for a partial STURAA test in the 7 yr/200,000 mile category.  The odometer reading at the time of delivery was 2,203 miles.  The Federal Transit Administration determined that the following test would be performed: 1.2 Servicing, P.M., Repair & Maintenance, 2. Reliability, 4. Performance, 5.7 Structural Durability Test, 6. Fuel Economy, 7.1 Interior Noise Test (conditions #2 and #3 only), and 7.2 Exterior Noise Tests.  Testing started on June 10, 2009 and was completed on August 31, 2009.  The Check-In section of the report provides a description of the bus and specifies its major components.

 

The primary part of the test program is the Structural Durability Test, which also provides the information for the Maintainability and Reliability results.  The Structural Durability Test was started on June 15, 2009 and was completed on August 28, 2009.

 

The interior of the bus is configured with seating for 21 passengers including the driver.  Free floor space will accommodate 10 standing passengers resulting in a potential load of 31 persons.  At 150 lbs per person, this load results in a measured gross vehicle weight of 15,460 lbs.  In order to avoid exceeding the GAWR (9,500 lbs) of the rear axle, ballast for 3 standing passengers was eliminated.  This reduction from full capacity resulted in an adjusted measured gross vehicle weight of 14,670 lbs and was used for all dynamic testing.  The middle segment was performed at a seated load weight of 13,960 lbs and the final segment was performed at a curb weight of 10,290 lbs.  Durability driving resulted in unscheduled maintenance and failures that involved a variety of subsystems.  A description of failures, and a complete and detailed listing of scheduled and unscheduled maintenance is provided in the Maintainability section of this report.

 

The Reliability section compiles failures that occurred during Structural Durability Testing.  Breakdowns are classified according to subsystems.  The data in this section are arranged so that those subsystems with more frequent problems are apparent.  The problems are also listed by class as defined in Section 2.  The test bus encountered no Class 1, 2 or 4 failures.  The three reported failures were all Class 3. 

 

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 17.96 seconds.

 

A Fuel Economy Test was run on simulated central business district, arterial, and commuter courses.  The results were 1.08 M/lb, 1.09 M/lb, and 1.89 M/lb respectively; with an overall average of 1.23 M/lb.

 

A series of Interior and Exterior Noise Tests was performed.  These data are listed in Section 7.1 and 7.2 respectively.

Number: 0909-P
Model: ALLSTAR 25 (CNG)
Manufacturer: STARCRAFT BUS
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