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just a short (334 mile) drive from bristol to dartford and back with jason jeffries to collect another truck to go with the 4 other's i have!!  WP_20210409_18_40_05_Pro.mp4

Hi all just found out my old login that was lost on a dead PC. My friend Mal sent me these today. I thought I would share. David.

Been asked to post for an old friend who bought this 981 from the Digby Lovell auction this summer ,  one of the photos was taken at GDSF 30 years ago !

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18 hours ago, john1950 said:

Just as an aside, a ball park figure of 1 per cent fall in power output for a diesel engine for each 10 degrees increase in air temperature above 90 degrees F. 32 degrees C. manifold intake temp.  

never new that john thank you for sharing, going off that the hercules should pull better as the air cleaners are mounted on the opposite side of the engine to the exhaust. were the british army fitted rolls c6's had both air cleaner mounted write next to the exhaust manifold. but they were limited to 10 mph max when loaded with a cent. so they would have been in the low gears any way so max power wasn't a massive benefit really.

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I would think the speed limit was more to do with stopping the rig at that weight, even with the extra axles and brake drums of the later Dyson trailer. That Hercules was a well engineered piece of equipment for its day, and ahead of its competitors in some respects. Both power units give a good account of themselves even today. I was involved years ago finding out what pulling power was needed to move a 115 ton trailer and load from a standing start. It turned out the initial start was 7840 lbs with 1120lbs to keep it rolling on the level. That was within the site speed limit of 10mph, then the old equation double the speed square the power is relevant. Of course the fuel that we use today is not the same as when these engines were designed. 

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41 minutes ago, john1950 said:

I would think the speed limit was more to do with stopping the rig at that weight. 

Don’t forget in those days speed limit for over 3 ton vehicles was 20mph, so understandable that abnormal would be lower speed limit.

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A good point. What would the people who set the motoring rules in those days think if they could come back and could watch the traffic go by from a motorway bridge.

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