The engine is designed to be pressurized, for more power (though in this video it is running at atmospheric pressure), and, as it was to put out mechanical power, it needed a shaft to penetrate the crankcase. Shaft seals create friction and pressure leakage losses, so I
made a magnetic drive, where magnets on an inner drum on the crankshaft drive magnets on an outer drum, through a non-magnetic pressure barrier. The power gets out, but the working gas does not. AR
Very nice! Congratulations again. You're engine are really impressive, and show the truth about the false idea that this engines have very low power/torque and potencial to be used in the present. Even that speed valve seems very interesting... could you explain how it works? Tanks and many many congratulations.
The speed controller is a poppet valve that connects the working gas to a larger "volume", thereby lowering the effective compression ratio, and thereby reducing power output.
@MrNik1001 Actually, the dead volume speed controller is more efficient than a throttle, as it does not involve "pumping losses", which a throttle unfortunately does (like breathing through a straw, for example). These losses are one of the several reasons why diesels (which need no throttles) are more efficient than gasoline engines.
The efficiency of this engine has not been measured; the reason is that power output (primarily power per pound of engine mass) is the primary issue in my larger machines. Efficiency has not been a major concern at this point. Moreover, to get serious about it, one would need to design a heat recuperator for the burner; and the considerable effort to do that is better spent on other matters at this point.
Thank you for answer. I understood the need of recuperative burner, but, as far as i have searched i the internet, Your engine, model d-90 was used in some high school projects.. And also, there was a lot of scholar articles. It is strange, that no one has calculated efficiency. But maybe You have calculated gas consumption rate ? It would be rought, but would show some info.
Also -are there any way, of to communicate with you? There are some question, according to simplifying. ST
I am unaware of the 90cc engine being used in any high school projects. Some years ago I offered kits of a 15cc and (later) a 20cc engine, which were relatively simple designs, with unfinned heaters, no regenerators, simple "close clearance" pistons, etc.. If you would like to communicate directly, my e-mail is
That is more - Your engines should be more efficient, in comparison with other known examples with air as working fluid. It could be seen in air pressure/working volume/ produced power ratio.
Soo cool. Id love to see a design with a couple inline cylinders that cound be lugged into holes in a steel sheet attached to the back of a wood bourning stove with small generator so you could charge batteries in a cabin with it.
Very nice engine! Not sure if you remember, but I built a "Ross yoke" Stirling engine before I knew of you, back in 1980, in the Philippines - we met in Florida at an IECEC meeting in 1983. I found the yoke design in an old book about unusual mechanisms. I respect your work a lot.
Some years ago I offered a kit on the B-20 engine, (an also a 15cc V alpha engine) which included the crankcase casting, a stainless steel drawn cup for the expansion piston, plans, and a few other bits & pieces. This ultimately took too much time away from my own experimental engine work. A.R.
very good job thx you
vladimirryouska 2 days ago
The engine is designed to be pressurized, for more power (though in this video it is running at atmospheric pressure), and, as it was to put out mechanical power, it needed a shaft to penetrate the crankcase. Shaft seals create friction and pressure leakage losses, so I
made a magnetic drive, where magnets on an inner drum on the crankshaft drive magnets on an outer drum, through a non-magnetic pressure barrier. The power gets out, but the working gas does not. AR
aross345 1 week ago
What do you mean actually with ' magnetic drive' on 1:57 ?
1shnitsel 1 week ago
Very nice engine.
Great work :)
The speed valve is also very interesting.
1shnitsel 2 weeks ago
Pretty nice construction!
Congratulation!
bladeattila 3 weeks ago
Great work!!
hdkivela2 3 weeks ago
Very nice! Congratulations again. You're engine are really impressive, and show the truth about the false idea that this engines have very low power/torque and potencial to be used in the present. Even that speed valve seems very interesting... could you explain how it works? Tanks and many many congratulations.
StirlingEngine123 3 weeks ago
@StirlingEngine123
The speed controller is a poppet valve that connects the working gas to a larger "volume", thereby lowering the effective compression ratio, and thereby reducing power output.
AR
aross345 3 weeks ago
@aross345 would that mean it's more of a brake than a throttle?
MrNik1001 3 weeks ago
@MrNik1001 Actually, the dead volume speed controller is more efficient than a throttle, as it does not involve "pumping losses", which a throttle unfortunately does (like breathing through a straw, for example). These losses are one of the several reasons why diesels (which need no throttles) are more efficient than gasoline engines.
AR
aross345 3 weeks ago
Super engine. Have You ever measured it efficiency ? It should be better than philips engine/
staskaaa1 9 months ago
@staskaaa1
The efficiency of this engine has not been measured; the reason is that power output (primarily power per pound of engine mass) is the primary issue in my larger machines. Efficiency has not been a major concern at this point. Moreover, to get serious about it, one would need to design a heat recuperator for the burner; and the considerable effort to do that is better spent on other matters at this point.
AR
aross345 9 months ago
@aross345
Thank you for answer. I understood the need of recuperative burner, but, as far as i have searched i the internet, Your engine, model d-90 was used in some high school projects.. And also, there was a lot of scholar articles. It is strange, that no one has calculated efficiency. But maybe You have calculated gas consumption rate ? It would be rought, but would show some info.
Also -are there any way, of to communicate with you? There are some question, according to simplifying. ST
staskaaa1 9 months ago
@staskaaa1
I am unaware of the 90cc engine being used in any high school projects. Some years ago I offered kits of a 15cc and (later) a 20cc engine, which were relatively simple designs, with unfinned heaters, no regenerators, simple "close clearance" pistons, etc.. If you would like to communicate directly, my e-mail is
aross345ar@yahoo.com.
AR
aross345 9 months ago
@aross345
That is more - Your engines should be more efficient, in comparison with other known examples with air as working fluid. It could be seen in air pressure/working volume/ produced power ratio.
Stanislav
staskaaa1 9 months ago
Soo cool. Id love to see a design with a couple inline cylinders that cound be lugged into holes in a steel sheet attached to the back of a wood bourning stove with small generator so you could charge batteries in a cabin with it.
THeScoobyNoob 9 months ago
I appreciate the work and design. Can you design the bigger stirling engine say 3KW or 5KW and sell the design?
MrDesifan 1 year ago
SOO COOL
SWINGREGORY 1 year ago
Could put one of those on a wood pettet stove pipe?
pgm98387 1 year ago
beautiful machinery
lthnnpwr 1 year ago
Amazing machine!
Finally something 'modern' that delivers power :)
I would love to have one, and put it to real use!
Richard
electrique527 1 year ago
Very nice engine! Not sure if you remember, but I built a "Ross yoke" Stirling engine before I knew of you, back in 1980, in the Philippines - we met in Florida at an IECEC meeting in 1983. I found the yoke design in an old book about unusual mechanisms. I respect your work a lot.
approtechie 1 year ago
Nicely done sir.
TheBattleWagon 2 years ago
Some years ago I offered a kit on the B-20 engine, (an also a 15cc V alpha engine) which included the crankcase casting, a stainless steel drawn cup for the expansion piston, plans, and a few other bits & pieces. This ultimately took too much time away from my own experimental engine work. A.R.
aross345 2 years ago
Have you ever released plans for this or other engines for sale?
dieselmotorcycle 2 years ago
Beautiful looking engine
dieselmotorcycle 2 years ago