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Hi Thanh, Been absent for a while myself. Nice to see your work again and it is a nice job you have done.
Have you worked on or made any fluid dyne engines. Might have to ask Tom as I can't find anything as yet that suits.
Nice to be back though.

Tom - Not sure what you are looking at might work. It appears to be a thermo acoustic engine and these need to be well balanced. Not sure they can be made to variant pressure. Tibsim is very good at making these and he is member of this group. Below is a link to one of his engines. https://www.youtu...

Hi Tom Again
Forgot to tell you I use these for casting my silver items as well. Temperatures used here are at 500 Deg C and have not caused a problem.
So temperature here is no problem for our hot air engines. These cake tins are around 8" diam (200mm)
Trev

I use these ones Tom and are very strong.
I buy them from the cheap shops for around $5.00 AUS and are cooking bowls and can with stand 300+ Deg C. I have used them for water pumps in my Engines and have lasted a few years without wear. Hope this helps

Here is a pic of the engine. One of these were used at the Mossman Mill near Cairns.

Hi Tom
Maybe the hit & Miss engine is a little difficult in an hot air engine but I believe the Bailey Engine was pretty close though it did use a governor of sorts which kind of does the same thing.

Excellent machining Thanh. Love it and a beautiful action of the Stirling motor.

Very impressive Yorky. Loved your pipework and ingenuity of the twin motors.
Trev

That will be interesting if all goes to plan with the ceramics. Please keep us informed.
Trev

Sure is Danalin You will find that the stainless is a lot more resilient than steel is and even that can shred. I hope all goes well with you. I also noticed that you were going to use a alloy displacer. Ian gave me good warning that this may melt under high heat conditions, and! Yes, that is exactl...

Hi Danalinscott Again looking at the regenerator for you and what you are using - Using steel wool maybe not a good idea and this is due to the weakness of the fibres. You will find the steel wool will shred to pieces over some use. I found that out the hard way. You may find that the use of stainle...

Yes. When the diaphragm is mid way is when the engine requires more force to move up or down.
I guess it all depends how the diaphragm is manufactured.

Yep! See your point. Diaphragms are an excellent piston, but one must also be alert for bulging which wastes energy and also a major problem is using a diaphragm that is too thick. If it is too thick then a lot of energy is required to pull back past the mid range area. I actually solved this proble...

Hi Mike
Sorry for the long delay, been away for a few days.
Below is a picture of the Bailey Engine. You notice that this is a Beta type engine - Not a Gamma Engine. What I did was to try and convert the Gamma Engine I had with a Bailey Linkage.
Turned out to be quite successful.
Trev

danalinscott The design looks good and I have seen this idea on a petrol engine operating the cams at a show a few years back. They had some heavy support for the cam assembly due to side stress. This could also be of consequence to your design as well. In that, I mean that the ball bearing has to l...