Jensen 20G Model Steam Engine | Live Steam
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- Опубликовано: 8 сен 2024
- Watch the Jensen 20G electrically heated steam engine power plant running and driving a small generator with a lamp post.
Jensen Steam engines hold an interesting position in the market of model steaming. Build quality is typical of American-made hardware: very robust, somewhat overbuilt, not too many decorative details. No flimsy parts that break easily, and no tinny boilers. All important parts are made from thick gauge materials. This model steam engine power plant oozes quality, from the hardwood plywood base to the boiler and engine. Sure, it doesn't have the "Stuart models" attention to detail and historical authenticity. But it's robust, very easy to operate, and has lots of playability. And it's a lot less expensive than a Stuart steam engine plant.
Specifications
The double-acting cylinder's bore and stroke are 3/4" (19 mm), so this is considerably more powerful than typical "toy" steam engines; and it's not a toy, but more of a collector's item. As you can see in the clip, its a quite powerful and fast steam engine capable of driving a small generator. It can also drive multiple accessories. The steam for the large cylinder is generated by a 660 watt electrical heater inside the boiler.
Advantages of electrical heating
Using an electrical heater for a model steam engine is perhaps not for the steam purist who would say that model steaming must involve the combustion of some sort of fossil-based fuel. However, there are very significant advantages of using electrical heating: It's much less expensive, and it's much safer. No fuel tabs, no methylated spirit burners, no candles, no gas canisters and no fumes. You can run the engine indoors in the kitchen and it will barely smell any different than a water cooker. Just add water to the boiler and plug in the engine to a wall socket, and the electrical heater will build steam in a few minutes.
Other interesting features
Some other aspects that I haven't seen on other commercially available finished steam engines is the Stephenson reversing mechanism and a genuine large AC generator with a lamp post. This is a very nice touch. There's no "cheating" by using a cheap DC motor for a dynamo. This generator is clearly made by Jensen for generating AC power for their engines, and being able to watch the large coils of the generator as it spins and generates power adds to the authenticity and learning experience.
A lesson on steam engine efficiency
Using an electrical heater actually adds significantly to the learning experience: Since we know that the boiler is heated with a 660 watt heating element, and since we can measure the voltage and current on the lamp post, it is obvious that the steam engine's energy conversion efficiency is quite low. If we assume we can power a 1 watt bulb, the system's efficiency is 0.15%, which is appallingly low. In effect, we're spending 660 watts to generate 1 watt of power. Where is the energy lost? Some is lost in the boiler as some heat is simply dissipated to the surroundings instead of being converted to steam. Some is lost in the steam pipe and in the engine due to being cooled down. Some is lost on account of steam leaks from the boiler, whistle, steam valve and due to leaks in the engine itself. But the vast majority of the power is lost in the exhaust pipe: Water in steam form contains lots of energy, so lots of energy is lost simply because steam is released to the atmosphere. If you want to know more about the thermodynamic theory, search for "Carnot cycle".
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I had a toy steam engine fired by alcohol when I was a kid. I'd love to build a model tug boat powered by something like this ... RC of course.
Probably simple, just need to have a clutch pad and a belt connection from the engine to the propeller.
Alcoholism engine 💀
@@manuelmarques3458 🤣🤣🤣
Had a similar one back when I was 11. It got me interested in boilers and steam generation.
Later in life I became a 3rd Class Power Engineer and went on to a lucrative career in building maintenance.
Thanks for sharing your story. I think stories like yours is one of the key reasons we should encourage our young people to get interested in technology.
@@RetroTechyNerdyStuff agreed
@Doctor Whowhotheowl I was making $80,000 a year. I retired at 56 with a nice pension. Been retired 15 years
What a wonderful machine!
Thank you for sharing, sir!
I still have my Jensen engine I got for Christmas as a kid!😃👍🛠️
I just pulled my Model 75 out and fired it up. Was a Christmas present from mid 1960’s along with the Model 100 Workshop. Contacted Jensen about a drive spring between the two. It measures 25.5” circumference with a string. They only carry 6” and 9” drive springs. Waiting to hear back from them.
@@jeffmc306 would love to see it, could you make a video of it?
@@diplexnormal3353 I shot the video this afternoon; editing now! Will post to my RUclips channel as soon as it's done.
@@jeffmc306 I looked I saw no video!
@@ivanscountrymusicandcars2357 Sorry! It's up now ruclips.net/video/8clX_H7iigg/видео.html
This has a lovely sound!
I'm glad you enjoyed it. Indeed, this engine is just large and slow enough to produce the characteristic "chuffing" sound that we associate with classic live steam.
I had a Wilesco, and did infact set the carpet on fire in my room running it. A Jensen will not give a boy that life lesson. But it sure looks nice!
My old Wilesco did not put anything on fire, but it did set off the smoke alarms several times, until my parents ordered me outside when firing the engine.
Wow a regulator and a reverser. Nice.
Easily the most elaborate way to power a lightbulb. From electricity to heat to rotational energy to electricity to lightbulb
Indeed, and to close the circle perfectly, I should replace the heater inside the boiler with an old-style lightbulb. Then we'd get "lightbulb to heat to rotational energy to electricity to lightbulb" :-D
you have all the cool toys
had mine for 50 years no gen. and mine burns fuel tablets some of the good old toys
Looks pretty 😍
I should get out prob one of the rarest engines out there, the 1939 Mamod SC3 I acquired some years ago, in its original box and all complete save missing a drive band and works like a champ, only a handful were ever made due to war breaking out almost the same time and Mamod became a war effort factory turning out precision parts for weaponry and aircraft. After WW2 the design was never resurrected making it uber rare in steam engine circles.
I would like to see that, I looked it up and it looks like a beautiful engine with nice, heavy flywheel.
...They eventually figured out there was a more efficient way to power the lightbulb.
Making electricity from electricity. Develishly clever.......................
???
@@markfrench8892 I think what he means is the water gets heated turns into steam. It then travels through the pipes which makes the engine go! After that the pulley from the engine is hooked to the pulley from the generator. The generator in turn turns a light on. The water is heated with electric heaters. That’s a long way of saying The water is turned into steam using electricity! It is powering a light!
this model has a larger cylinder diameter, so there is more torque
Wow
use led bulb get better brightness
I've tried it. It does give somewhat better brightness, but since the generator produces AC the led bulb flashes a lot since it only accepts power with the correct polarity. The flashing makes it uncomfortable to look at, but it might work better if I add a rectifier, though, but then there's a voltage loss.
@@RetroTechyNerdyStuff Use a rectifier with capacitor, then you could charge a
mobile `phone as well !!
How can I purchase steam engine locomotive small
Hat die Maschine eine echte Kreutzkopfführung?👆👆👆👆👆😀😀 Viele Grüße aus Germany
Yes, the piston shaft is guided by a brass cross-head which you can see from 4:33-4-55. The connecting rod then goes from the cross-head to the crank.
How can u change the speed and make it go slower?
There are several ways to accomplish that: One is to increase the load by using a larger light bulb or adding accessories for the engine to drive. A more direct way is to use the valve on the steam line to reduce the steam flow; the downside of that is that the steam pressure in the boiler will increase and a lot of steam will be wasted because it will be vented by the safety valve. A better way is to reduce the voltage to the heating element by using a variable voltage transformer. I don't own one of these, but some hobbyists do this when they want the engine to run really slow for a long time because it will also reduce the water consumption.
How did you do this, do you know me?
What rpm does it get up to
I haven’t measured it yet, but probably around 8-900 rpm under load, and faster without load.
Much Vibration.
Hiw much does it cost?
I haven't checked lately, but you can find the latest prices on Jensen Steam Engines' own website (just google it). Mine was custom-ordered with 220 Volts heater (the standard is 110 V) for an additional fee.
А откуда что берётся? Где пар, где он?
The steam is generated by an electrical heater inside the boiler. No flame.
come greetings*?
i want
An overengineered transformator
Technically, yes. And water/steam cooled.
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