115cc twin alpha, early run

Early run of the twin alpha engine. Unpressurized, no burner, no active cooling. Fully balanced, runs quite smooth. much of the noise is from the fact that i used low quality gears and they are noisy.

Category:

Science & Technology

Tags:

• Stirling
• Engine
• Alpha
• Model
• Twin
• Cc
• run
• 115
• dual
• high
• speed

[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

[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.

[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.

[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.

[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.

[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

[barumman]

Nice work, thanks for sharing, :)

[CastlemanCode]

Great Work! Very Impressed. Looking forward to the numbers

[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