GLAVAL BUS Download PDF ReportEXECUTIVE SUMMARY
Glaval Bus submitted a model Entourage built on a Ford Motor Co. F-550 Super Duty chassis. The
test bus is diesel-powered 33 seat (including the driver) 33-foot bus, and was submitted for a 7
yr/200,000 mile STURAA test. The odometer reading at the time of delivery was 556 miles. Testing
started on December 8, 2009 and was completed on April 12, 2010. 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 December 23, 2009 and was completed on April 6, 2010.
The interior of the bus is configured with seating for 33 passengers including the driver. Free
floor space will accommodate 19 standing passengers resulting in a potential load of 52 persons.
At 150 lbs per person, this load results in a measured gross vehicle weight of 20,970 lbs. In
order to avoid exceeding the total GAWRs (19,500 lbs), ballast for 9 standing passengers was
eliminated. This reduction from full capacity resulted in an adjusted measured gross vehicle
weight of 19,710 lbs and was used for all dynamic testing. The middle segment was performed at a
seated load weight of 18,040 lbs and the final segment was performed at a curb weight of 13,390
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 are provided in the Maintainability section of this report.
Accessibility, in general, was adequate. Of the components covered in Section
1.3 (repair and/or replacement of selected subsystems), both the primary and secondary alternators
and belts proved difficult in accessing. Other components encountered during testing, were found
to be readily accessible and no restrictions were noted.
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. Of the two reported
failures both were Class 3.
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 15.83 seconds.
The Shakedown Test produced a maximum final loaded deflection of 0.409 inches with a
permanent set ranging between -0.003 to 0.005 inches under a distributed static load of 19,500 lbs.
The Distortion Test was completed with all subsystems, doors and escape mechanisms operating properly.
No water leakage was observedthroughout the test. All subsystems operated properly.
The Static Towing Test was performed using a target load (towing force) of
16,068 lbs. All four front pulls were completed to the full test load with no damage or
deformation observed. The Dynamic Towing Test was performed by means of a front- lift tow. The
towing interface was accomplished using a hydraulic under-lift wrecker. The bus was towed without
incident and no damage resulted from the test. The manufacturer does not recommend towing the bus
from the rear; therefore, a rear test was not performed.
The Jacking and Hoisting Tests were also performed without incident. The bus was found to be stable on the jack stands, and the minimum jacking clearance observed with a tire deflated was 10.9 inches.
A Fuel Economy Test was run on simulated central business district, arterial, and commuter courses.
The results were 5.83 mpg, 5.53 mpg, and 9.81 mpg respectively; with an overall average of 6.48
A series of Interior and Exterior Noise Tests was performed. These data are
listed in Section 7.1 and 7.2 respectively.