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Good job! I think I can hear a leak. From the sound, it seems to be leaking quite a bit. Fix that and you will probably see quite a bit of power increase.

Thanks for the advice Ian.

I am going to order some 4in. graphite bar stock from Aerocon systems. I don't know if I should get the fine or medium grade. Also any tips on machining would help. What type of lathe bit is best?

http://aeroconsystems.com/cart/graphite-rods/

Thanks All,

Yes, I agree with you. some cooling is taking place in the piston cylinder. When the gasses expand they are cooled, no doubt about that. I am just saying that if you look at this engine from an inertia point of view that the cooled gas does not contribute much to pulling the piston back in. Enertia ...

Tom, I think you are very close. You are explaining a pulse jet without knowing it. When the gas returns to the heat chamber the piston assists in this return. cooling in the piston cylinder is not what causes the piston to be pulled back in. The air speed is actually increased by the hot expanding ...

same here, I agree with some of Tom's conclusions. Pyrex is the last thing you would want to use for a cooling cylinder, This does raise some questions. Questions that can only be answered with testing. Unfortunately I need a running engine to do the tests. Perhaps the graphite piston aids in coolin...

After several attempts to construct a large lamina flow engine (mostly failures), I have come to some intersting conclusions. Although mostly failures I have learned a few things. I have tried many different compression ratios, stroke lengths, choke sizes, piston cylinder cooling, etc....... Nothing...

After more testing I agree with your conclusions. Although I have found that the choke size is very important to achieve the proper lag/delay in pressure change between the two chambers. I am thinking about placing a large diameter valve (light weight) where the choke would be. The valve would have ...

Very nice! So what is the estimated power?

I never Thought I could get a larger one running. As far as the ratio goes, Figure the volume of your cylinder diameter and desired stroke. Multiply that by 5.25. The answer should be the total volume of your heat tube and choke. This should get you very close. Make shure to leave a little bit of ad...

After thinking about a large lamina engine build for over a year now, I finally decided to try it. My goal is to build a large version using off the shelf materials. I started by finding detailed plans for a test tube version and scaling it up. I am using an air cooled vw cylinder. 3.5 in. diameter ...

From what I have read about stirling engines over the last few months, I have come to the conclusion that the only reason for placing the power piston at the cold end, is just to keep as many moving parts as possible away from the heat source. This makes it easier to seal the power piston and piston...

I also believe that a beta type could be split up in a similar way. Thus eliminating a seperate power cylinder.

I did the same test about a month ago. and my results were the same. Also I have started building one similar to the drawing you posted. The one where all three cylinders connect to the same spot on the crank.

Longboy, you use the term "equalibrium". That is a very good explaination of the system. When the air is cooled the whole system experiences a low pressure equalibrium almost instantaneously. When it is heated a high pressure equalibrium is achieved almost instantaneously. This is the basi...