115cc twin alpha, early run

[secondmouse1990]

Can't wait to see what this machine can do with enclosed burners and forced water cooling.

An interesting experiment would be for the next engine to have the hot and cold cylinders further apart and use a "cold cap" on the cold cylinder just like the hot cap but with a water jacket instead of a burner. The first engine to do this was the rider pumping engine but they used thick cast iron cylinders, a very large piston crown to cylinder gap, and a 120 degree phase angle.

[bmw2go11]

get 6 more and have 8 running all on one driveshaft

that would have so much torque omg

[StirlingEngine123]

Congratulations on this engine! Do you have any idea of how many power does it produces? Tkx and good work

[IndianolaStirling]

I haven't been able to do a power test on it yet, been swamped with work

for the last six months. I was shooting for around 125 watts unpressurized

and hopefully upwards of 200 watts pressurized, (it doesn't have a

crankcase yet but it's part of the design and I have the materials, just

haven't had the time to finish it).

Thanks for the comment,

-Devin

[barumman]

Nice work, thanks for sharing, :)

[CastlemanCode]

Great Work! Very Impressed. Looking forward to the numbers

[IndianolaStirling]

I will be measuring power, accurately, soon. I need to build a burner first to get an idea of capability because a torch simply doesn't provide enough heat over a large enough area. Burner is about half done. I will be posting more videos as soon as burner and cooler are done, with power readings. Power goal is around 150 watts, perhaps more pressurized.

[iliacht5]

Sounds really powerful. Could you try to run something with it so you can measure even very appr. what is its output power.

[aross345]

Nice engine! As far as I know, this is the first double alpha up and running. Congratulations.

Andy Ross

[IndianolaStirling]

Not sure I understand the question. There certainly are points of differing pressure, the engine needs those in order to run. As for dynamic balance it's pretty well balanced.

[mesio01]

I see that there are some points of balance. ¿pressure balance?. ¿Do you thik they can be solved changing the diameter or stroke of the cold pistons?

I look forward to the next video. Un trabajo cojonudo.

[IndianolaStirling]

Seems to vibrate less, I haven't had it at really high RPM yet because the torch doesn't provide enough heat. Most of the noise is due to the gears and the vibration resonating the table.

[BuildSomethingUseful]

Nice work. Does this 2 piston version vibrate less than your single piston version? Seems like it would be perfectly balanced this way but there is quite a bit of noise.

[IndianolaStirling]

Correct on all counts. Back stroke would mean the combined downstroke of the hot and cold pistons. Because it's an alpha it doesn't have a "displacer" per se. The hot caps are filled with a piston extension on top of the hot side pistons. Both hot and cold are responsible for compression and expansion to varying degrees.

[heatherroseisrflyer]

"The hissing sound you hear is the snifter valve sucking air in on each back stroke."

Do you mean the down or the up stroke of the power piston and/or the displacer?

The purpose of the snifter valve is to keep the cylinder pressure higher than the cranckcase pressure, correct?

It is a check valve that only allows the air to flow from the crankcase into the power and/or the displacer cylinder, correct?

Nice job, congradulations on a beautiful runner.

Good luck with the rest of the build.

[Longboy4]

On startup your engine sounds like a Diesel yard switcher engine moving down the track. Looks good guys!