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Re: Anyone need to run drawbar pull on their tra
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Posted by El Toro on October 28, 2006 at 18:07:33 from (205.188.116.133):
In Reply to: Re: Anyone need to run drawbar pull on their tra posted by Randy as in Randy-IA on October 28, 2006 at 15:47:18:
Hi Randy, When we ran drawbar pull tests, the test vehicle was operated with engine at full throttle. Almost all of the tanks we tested had converter transmissions and we ran by road speed
starting at the or near the max speed in each range. For the higher ranges we didn't need the trailers. We also ran full load fuel consumption
when running drawbar pull. When we finished the high ranges we would hookup to the trailers and we did the same procedure in the the lower ranges. We would keep loading the test vehicle
and set a road speed where it was near the max speed in that range. We would keep dropping the road speed of the test vehicle by small increments. If max speed was 10 mph in that range we would start at 10 mph and drop the road speed every 1 mph until we reached a stall. Some vehicles would start to lose traction. We would then let off the load and let the vehicle cool down by going back to 10 mph. Then we would repeat this procedure to see if the data was the same as the first run. We had sprocket counters on the test vehicle to measure wheel or track slippage. I will answer some more on Sunday how we did vehicles with stick shift transmissions. They were tested a little different. Hal
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