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Outside the bag the box came in.
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I remember old gas powered golf cars functioned simmilar to what you describe: I stop the cart, and the engine dies - I whack at the ball, get back in and mash the accelerator and the engine cranks up and I drive 22 feet to repeat the cycle. |
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I do like the idea of using a spring to stop/start the engine, but... |
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Once you release the flywheel brake, wouldn't the flywheel spin backwards? |
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I don't know how those golf carts work, maybe they are like an old Buick (1925?) we had? The generator and starter motor were in one unit which was always in mesh with the flywheel. Turning on the ignition powered the starter motor which cranked the engine until it started then the engine drove the starter motor as a generator. |
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I think I have the spring the right way around, braking the flywheel while the car is still rolling winds the spring. It does this by stopping the engine from rotating in it's normal forward direction of rotation, so the spring is wound up and the brake is holding it, when the flywheel brake is released the engine then starts turning again in the same direction. |
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The only way I can see this working is if the spring is attached between the flywheel and the propshaft. The brake pressure would have to be carefully regulated to prevent overwinding of the spring under coasting. |
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How would the car deal with a situation where you're almost stopped, then the car in front stops before you expected, so you have to do an emergency stop and the spring isn't wound up enough to start the engine? Can the system be over-ridden so the starter can be used? |
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factoid: an engine produces the most amount of exhaust fumes and is subject to the greatest amount of wear per revolution when cold-started. Not that this is like that. |
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you don't need a flywheel to crank a spring when the brakes are depressed. Why have a flywheel to perform this function when you can wind the spring by simply engaging it when the brakes are applied and releasing it when the brakes are released.... |
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It is the engine that needs the flywheel. |
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[Rayford], that statement is true if you start with some very low RPM (like current electric starters do it) and let the engine work up to normal idle speed by itself. If something (flywheel?) brings the engine up to normal idle RMP before fuel is injected everything works fine. |
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[Kiwi] I agree that flywheels are a little outdated for this purpose. Get a hybrid car where the electric motor alone can give you the initial kick. |
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Many years ago there were backup power generators that were started by an electrically powered flywheel being engaged with the crankshaft. There was a solenoid holding the massive spinning wheel off the engine which let the two connect when power failed. Maybe this could be adapted to your system. |
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It would have to be one hell of a spring to overcome engine compression on anything larger than a small 4 cyl.
I suppose you could use some kind of spark retard or compression release (like old Indian and Harley Davidsons). |
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[KJ] you either need a spring _or_ a flywheel, not both. |
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/It would have to be one hell of a spring / |
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Maybe connect the arrangement to a series of levers that compress the coil springs in the suspension. On releasing the flywheel brake, the springs unwind, giving the engine the kick it requires. The car almost literally springs to life! Add fake opening eyelids with big lashes to the headlights for comic effect. |
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[KJ] you either need a spring _or_ a flywheel, not both. |
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Hmmm, don't think so, the flywheel is part of the engine, it is already there, it allows the engine to run smoothly at low revs, every piston engine since your friend James Watt had one (except aero engines where the propellor does the same job). |
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There is no additional flywheel in my idea. Your link to flywheels no doubt points to a wealth of interesting information but flywheels do not play any part in this suggestion except as the existing point in the cars power system where the spring would be located. |
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When the engine is stopped so is the flywheel, the function of the spring is to store some of the energy recovered by retarding the forward motion of the slowing vehicle and to later release that energy to push the flywheel around a turn or two so re-starting the engine. |
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