Search found 228 matches

by Trevor
Fri Sep 30, 2022 3:23 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: I've been absent for a while !!
Replies: 2
Views: 1989

Re: I've been absent for a while !!

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.
by Trevor
Thu Mar 24, 2022 10:17 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling "Hit 'N' Miss" Hot air engine
Replies: 46
Views: 15586

Re: Stirling "Hit 'N' Miss" Hot air engine

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...
by Trevor
Thu Mar 24, 2022 5:37 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Making strong rubber/silicone diaphragms
Replies: 20
Views: 8650

Re: Making strong rubber/silicone diaphragms

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
by Trevor
Thu Mar 24, 2022 5:34 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Making strong rubber/silicone diaphragms
Replies: 20
Views: 8650

Re: Making strong rubber/silicone diaphragms

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
by Trevor
Thu Mar 24, 2022 3:22 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling "Hit 'N' Miss" Hot air engine
Replies: 46
Views: 15586

Re: Stirling "Hit 'N' Miss" Hot air engine

Here is a pic of the engine. One of these were used at the Mossman Mill near Cairns.
by Trevor
Thu Mar 24, 2022 3:17 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling "Hit 'N' Miss" Hot air engine
Replies: 46
Views: 15586

Re: Stirling "Hit 'N' Miss" Hot air engine

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.
by Trevor
Sun Feb 07, 2021 12:02 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My new Project !
Replies: 4
Views: 3238

Re: My new Project !

Excellent machining Thanh. Love it and a beautiful action of the Stirling motor.
by Trevor
Sun Apr 12, 2020 5:16 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Better late than never.
Replies: 7
Views: 4031

Re: Better late than never.

Very impressive Yorky. Loved your pipework and ingenuity of the twin motors.
Trev
by Trevor
Sun Apr 12, 2020 5:05 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Developing a 1000w generator based on approtechies' design
Replies: 32
Views: 36511

Re: Developing a 1000w generator based on approtechies' design

That will be interesting if all goes to plan with the ceramics. Please keep us informed.
Trev
by Trevor
Fri Apr 10, 2020 9:33 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Developing a 1000w generator based on approtechies' design
Replies: 32
Views: 36511

Re: Developing a 1000w generator based on approtechies' design

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...
by Trevor
Tue Apr 07, 2020 5:39 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Developing a 1000w generator based on approtechies' design
Replies: 32
Views: 36511

Re: Developing a 1000w generator based on approtechies' design

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...
by Trevor
Sat Feb 29, 2020 4:31 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Developing a 1000w generator based on approtechies' design
Replies: 32
Views: 36511

Re: Developing a 1000w generator based on approtechies' design

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.
by Trevor
Thu Feb 27, 2020 10:06 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Developing a 1000w generator based on approtechies' design
Replies: 32
Views: 36511

Re: Developing a 1000w generator based on approtechies' design

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...
by Trevor
Thu Feb 27, 2020 9:58 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Gamma Engine with Bailey Linkages
Replies: 2
Views: 8177

Re: Gamma Engine with Bailey Linkages

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
by Trevor
Thu Feb 20, 2020 7:22 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Developing a 1000w generator based on approtechies' design
Replies: 32
Views: 36511

Re: Developing a 1000w generator based on approtechies' design

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...