Mamod SP6 Model Steam Engine Running on Steam | Live Steam
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- čas přidán 17. 11. 2022
- Watch the Mamod SP6 model steam engine running on steam.
The engine is slightly modified, and is fired using a propane/butane gas burner instead of fuel tabs. This makes it much easier to control how quickly steam is generated. This also allows longer runs because the flame can be set at very low intensity.
The UK-made Mamod SP6 steam engine has an interesting combination of features that sets it apart from many other model steam engines: It uses an in-line displacement lubricator which ensures the cylinder is kept oiled during long runs. It also has an effective steam valve to accurately regulate the steam flow; and it has an interesting reversing mechanism which allows the flywheel to be reversed simply by flicking the flywheel in the desired direction.
Unlike the rest of Mamod's current range of model steam engines which are single-acting oscillators, the SP6 is a double-acting sleeve valve type. According to the best sources I could find, the cylinder bore is 9.5 mm, and the piston stroke is 12.7 mm.
According to Mamod it's their most powerful engine, and as you can see it's running fast. Although I normally prefer to run my engines under compressed air because it's less messy, there's something unique about the sound of running an engine under live steam. This is especially true with the SP6, as it has a very distinct and sharp puffing sound when running under steam that does not appear as disctinctly when running under air. I attribute this to a very accurate machining tolerances resulting in a very tight fit in between piston and cylinder, piston rod gland and the slide valve. The engine is in fact a bit tricky to start on steam because the first steam reaching the cylinder after opening the steam valve will condense inside the cylinder and cause a near-total hydraulic lockup, and all valves and seals seem so tight that getting the water out takes quite a bit of careful wiggling with the piston rod and slide valve. As soon as the cylinder is heated up and emptied of water, the engine runs very well.
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Complete, only the pressure gauge is missing.
Ich werde das in Smart fortwo einfügen, danke.
Great, I can charge my phone now.
"Oh no, my phone is dead, let's ... start the steam engine" :-). In all seriousness, this little engine won't generate nearly enough power for charging a phone, but it's a cute idea.
@@RetroTechyNerdyStuff probably not, it makes me wonder if it could. How much horse power does that have (I know it’s a fraction of one) because all it needs to do is produce at least five volts or 18 watts of power.
Btw, if you try this, please share my name. I wanna see that so bad.
@@diplexnormal3353 Classic USB is 5V and 1A, so 5 watts of powers. Some USB standard support much higher currents. I did a back-of-the-envelope calculation, according to which this little Mamod might theoretically develop something like 0.3-0.5 watts of power to the shaft at 900 rpm and 20 psi steam pressure. This is assuming no mechanical friction losses, and then we need a drive belt, a small dynamo and a voltage regulator, causing further significant losses. I have a gut feeling we'd probably be lucky to get 0.1 watts of effective electrical power. Subject to actual testing, of course ;-) Perhaps measuring effective power developed by the engine is a good subject for an upcoming clip.
@@RetroTechyNerdyStuff or you could push one of your engines to a near peak, im not saying to try to actually charge your phone by like 1 percent, just enough power for a phone to detect. I am by no means engineer but it’s just a thought.
SP7 is more powerful, if gas fired, of which, as far as I kmow, there's only one, because I have it 😁. Alas Mamod's quality put me off buying more and I've had a few. Some sold on, sxome still in the collection, for now.
The SP8 looks very nice too, and a few years ago Mamod also made a beam engine, the SP8. I too have been somewhat put off by Mamod's quality control. This is the only Mamod engine I've owned and it had several problems out-of-the-box. If I may ask, which specific aspects of the quality put you off buying more?
@@RetroTechyNerdyStuff it would take all day to air my concerns. Check out my shown and special traction engine call something like "has manor changed in the last 8 months". It will give you a good idea. They ate under new ownership now, so maybe things will change. I have a SP8 beam engine. One of the best I had from them, but the general enthusiasts didn't go for it.
@@PLAYINGAROUND You tickled my curiosity so I watched your video. Very interesting, and an excellent walkthrough of the embarrassing mistakes in the workmanship. Mine also had defects, although less severe, probably since it's a less complex engine with fewer things to go wrong. It's sad that quality is sliding with these engine, but to be fair to Mamod in my experience they are not the only steam engine manufacturer which has let the quality slide over the years.
Fun 😊
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