Search found 24 matches

by tom-rock
Mon Nov 27, 2023 12:42 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Thermoacoustic or Thermal Lag engine better for energy production?
Replies: 8
Views: 5864

Re: Thermoacoustic or Thermal Lag engine better for energy production?

Hi, thank you very much for the well-founded contributions and interesting documents. One of the most powerful research thermal lag motors I have seen so far is the one from Geoff Vaizey. His engine stopped when he used helium instead of air and the simulation by Allan Organ, which was validated wit...
by tom-rock
Sun Nov 26, 2023 12:33 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Thermoacoustic or Thermal Lag engine better for energy production?
Replies: 8
Views: 5864

Re: Thermoacoustic or Thermal Lag engine better for energy production?

Hi all, I haven't learned enough about thermoacoustic and thermal lag engines but as far as I know the basic principle of operation is fundamentally different. Peter Tailer says in his US patent 5414997A: 'A thermal lag engine has a cooled cylinder and piston connected to a heated chamber. A working...
by tom-rock
Sun Nov 26, 2023 4:26 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Thermoacoustic or Thermal Lag engine better for energy production?
Replies: 8
Views: 5864

Thermoacoustic or Thermal Lag engine better for energy production?

Hi all, although I am developing my other engines further I already think about the the concept of my next big engine. I am still undecided whether a Thermal Lag or Thermoacoustic engine is more promising for an electricity-generating system to support our solar system in times of low sunshine. With...
by tom-rock
Fri Nov 04, 2022 1:08 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rombic Drive - geometry design and gear selection
Replies: 2
Views: 1555

Re: Rombic Drive - geometry design and gear selection

Hi Simon, since years I am building rhombic Stirling engines and indeed its an ingenious invention. The rhombic geometry allows many possibilities of volume variations especially the general form (different lenghts of con rods etc.). Look after the original analysis "The Philips Stirling Therma...
by tom-rock
Sat Dec 18, 2021 12:21 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Amazing engines
Replies: 11
Views: 2927

Re: Amazing engines

I hope its ok to send a link to one of my own engine videos, there are several videos in my channel of my engines with up to 300 watts.

https://youtu.be/VcULP9Y-01A

Best wishes and greetings

Ralf
by tom-rock
Fri May 29, 2020 7:08 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: New half rhombic Stirling engine - who knows details of the crank drive?
Replies: 1
Views: 1507

New half rhombic Stirling engine - who knows details of the crank drive?

Hi, I just finished my new Stirling engine with half rhombic drive. The half rhombic Stirling is much more easy than my original rhombic engine (300W output) which will maybe lend to a useful generator/micro CHP in a small mini series. I know very little about the half rhombic crank drive and just f...
by tom-rock
Sun Oct 14, 2018 11:57 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: GPU-3 stirling engine
Replies: 2
Views: 3717

Re: GPU-3 stirling engine

Hi,

you can find the Stirling engine design manual free on the internet (as pdf I think).

It has very detailed data of the GPU-3.

Greetings

Ralf
by tom-rock
Sun Feb 18, 2018 1:30 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Temperature/preessure change while running?
Replies: 11
Views: 8052

Re: Temperature/preessure change while running?

Hi steedspeed and all, I have a pressure sensor attached to my stirling engine which measures the working pressure in real time while running. At the moment it has a pressure difference with 10 bar meanpressure of 7 bar (8 bar min / 15 bar max pressure). You can see it in this little video: https://...
by tom-rock
Sun Nov 05, 2017 1:10 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Imploding displacer - make it leaky?
Replies: 3
Views: 4699

Re: Imploding displacer - make it leaky?

Hi Ian, the displacer is made out of titanium which also looses much of its strenght at high temperatures as I read now. Maybe I will try a good titanium alloy or stainless steel if the new one (also out of pure titanium but a bit more sturdy and with 2 instead of 1 radiation shield) which in nearly...
by tom-rock
Wed Nov 01, 2017 1:03 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Imploding displacer - make it leaky?
Replies: 3
Views: 4699

Imploding displacer - make it leaky?

Hi all, yesterday my displacer imploded and it was my second one recently. Now I ask myself if the next one should be more sturdy (which makes it heavier and more heat conducting what I want to avoid!) or if there is a way to make a pressure compensation without creating additional dead space. I thi...
by tom-rock
Tue Feb 23, 2016 1:47 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: New Stirling scaled of GPU 3 first testrun
Replies: 5
Views: 5063

Re: New Stirling scaled of GPU 3 first testrun

Hi, thanks for you kind comments. Ian you are right the big bearings have to much fricton I will fix this in the future, thanks. After fixing countless provisionals my main focus is on finding the right balance between friction and tightness in all seals. (Piston rings and displacer rod seals). I al...
by tom-rock
Sun Feb 21, 2016 1:10 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: New Stirling scaled of GPU 3 first testrun
Replies: 5
Views: 5063

New Stirling scaled of GPU 3 first testrun

Hi, as discussed in an earlier topic I modified my Stirling engine a lot. The heat exchangers are now scaled of the famous GPU 3 with the methods of Dr. Allan J Organ. I hadn´t much time the last month so it took much longer to complete the Engine. A first testrun with a lot of provisionals and by f...
by tom-rock
Mon Apr 13, 2015 10:46 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rhombic drive calculations
Replies: 4
Views: 6504

Re: Rhombic drive calculations

Hi JR, I used the original publication "The Philips Stirling Thermal Engine" of Roelf Jan Meijer (original invention and intensive analysis of the Rhombic Drive Mechanism) which you can find free in the net. If you search a bit you will find a lot in the net. Also a good explanation is in ...
by tom-rock
Mon Mar 30, 2015 11:05 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22660

Re: Stirling engine with rhombic drive 75 ccm

Hi all, Plani: I think a lip seal out of W300 will not work because W300 is very brittle and hard. When I take the sealing apart I will male a photo of the face seal. The burner delivers more than enough heat, what I need is additional outside surface on the heater head. It is internally slotted wit...
by tom-rock
Wed Mar 25, 2015 1:04 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22660

Re: Stirling engine with rhombic drive 75 ccm

Hi Plani, the hot cap glows bright red with 1 bar, with 2 or more bars it doesen´t but it isn´t tested enough because at the moment I can´t heat it up to full red heat because I have problems with intergranular corrosion at the ss-heater head due to the regular red heat, the next one will be out of ...