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| I feel a project coming on, maybe too daft? |
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| John Hill:
Thanks Dave, that is the sort of thing I had in mind, except I thought of having vertical cylinders, or maybe canted out the rear a bit. I just need to figure out how to make an internal combustion engine pull from zero rpm? :scratch: It would be all very well having something that could scare the wits out of the rider as it belted along at 100kmph but not really much use for phuttering around in the town parade if it has to be pedalled up to 30kmph to get it started! Thanks Kjelle, yes 'contraption' the very word I had in mind! :lol: |
| Stilldrillin:
--- Quote from: John Hill on December 13, 2011, 03:32:49 PM ---It would be all very well having something that could scare the wits out of the rider as it belted along at 100kmph but not really much use for phuttering around in the town parade if it has to be pedalled up to 30kmph to get it started! --- End quote --- John. What about a clutch, in the wheel hub? :smart: David D |
| BillTodd:
--- Quote ---I just need to figure out how to make an internal combustion engine pull from zero rpm? --- End quote --- They do. Just not that much. A compressed air engine is a pressure engine. The energy is stored as gas pressure (static pressure) it will produce a force on the piston as long as the inlet is open. Once the inlet is closed the pressure will drop as the gas expands (pinching energy from the surrounding to do so). A steam engine has the static pressure from the boiler, but it also has a lot of energy stored as heat that allows the gas (water vapour) to continue expanding without the pressure dropping much (it has enough energy to be expanded two or three times while still doing useful work) An internal combustion engine has some of pressure form the chemical conversion of liquid fuel in to gas, but most of the energy comes from the heat of combustion. If you can keep the heat in the cylinder, the gas will continue to push on the piston. Of course the dilemma is that while a steam engine will never get hotter than the steam, an IC engine will get to a very high temperature if not cooled in some way. So, how about a total loss internal water spray cooling system? Bill |
| John Hill:
--- Quote from: Stilldrillin on December 13, 2011, 03:51:27 PM --- --- Quote from: John Hill on December 13, 2011, 03:32:49 PM ---It would be all very well having something that could scare the wits out of the rider as it belted along at 100kmph but not really much use for phuttering around in the town parade if it has to be pedalled up to 30kmph to get it started! --- End quote --- John. What about a clutch, in the wheel hub? :smart: David D --- End quote --- The wheel is the flywheel so I dont think the engine would idle very well, if at all... :scratch: |
| John Hill:
Some good thoughts there Bill. I did have an idea some time ago of arranging an 'air' cylinder to be charged from the combustion chamber when a vehicle engine was in 'over run'. Then when the car stopped, at say traffic lights, the engine would stop completely and when the driver pressed the gas pedal the stored 'air' would start the engine smoothly and almost silently. If it was a 6 cylinder engine there would always be one cylinder ready to be the 'power' cylinder. Getting back to this crazy bike idea, I wonder if that scheme could be used? Cooling, what do you think of the idea of wrapping the cylinders in cotton rope and using capilary action to keep it wet from a water resevoir? The cooling would come from evaporation, it might be tricky to arrange the cotton covering for the head. |
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