Since you called for comments from the thinkers(one of my old AKAs)- About your mileage figures pulling trailer and empty, Empty your Cherokee as a wagon design with squared off back would have a large low pressure area- a vacumn bubble- behind to about twice the distance of the hieght of vehicle, a drag factor affecting mileage empty. The small trailer would fill this 'bubble' and reduce drag effect alsmost as much as its own rolling resistance and lower drag bubble- the term used in NASCAR is drafting, same affect in minimal air resistance total and increased fuel economy for both cars and a touch extra speed for the pair. I used to draft semis on motorcycle- got 60+mpg on R69 compared to 45/50MPG fighting head wind not drafting. Airstream trailers have some mileage figures showing affects of drag on various vehicles. Gibbs cartridge? Compare it to the Ackley Improved and you see similar results using fine ball powders as compared to Cordite used in early H&H. The .308 case taper, shoulder angle , short neck and higher pressures should be compared to 30-06 and its original powder and pressures with a 10 gram bullet- performance is similar and .308 case is about a 1/2 inch shorter- allows shorter reciever and bolt travel in automatic/self loader firearms using the modern powders. Rough figures for drive trains- chain and shaft drives about 97/98 % effecient, V belts about 95/96%, a right angle drive is about 97%, a straight cut gear is about 98%, a bevel gear/hypoid drive is about 96/97%. The usual figure for engine power at flywheel compared to wheel power is 10% loss through drive train. A SAE rating is also roughly 10% more than a DIN rating on same engine- example : the old VW beetle 1200 engine was advertised in US as a 36HP, in Germany DIN was a 30/32HP. Your 5th wheel drive generator would have mechanical loss before driving alternator. Electrical power loss due to heat and mechanical loss I'm not so sure about figures- the one figure that comes to mind is a 35% loss of input shaft power compared to output energy from a couple examples on generator usage and railroad engines doing EMD 3000hp diesels with electric drive to wheels compared to engine shaft output. Battery storage seems to be another 30% or so loss. Laws of physics are self enforceing observations of what seems to happen. Congress may pass a law saying laws of physics rescinded--but mama nature will show the congress critter and you wrong for trying to break her 'laws'. Any body else want to contribute a chuckle? RN
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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