Search found 114 matches

by derwood
Thu Dec 16, 2010 12:59 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type engine Idea/need input
Replies: 31
Views: 22412

Re: Alpha type engine Idea/need input

In my explaination I realize that there is no vacuum inside. I only mean low pressure.( Lower than atmospheric). I also agree that the power piston goes back in due to this reason. But, it does produce power on this stroke. Also, when you say "the hot air would just blow by the power piston&quo...
by derwood
Thu Dec 16, 2010 2:22 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type engine Idea/need input
Replies: 31
Views: 22412

Re: Alpha type engine Idea/need input

If you will read the quote you posted you will see that I said pressure was not moved but that air was. the air is moved from on side to the other (hot side to cold side). This happens because the displacer piston occupies space and the air has to move (air is displaced) to the other side. When the ...
by derwood
Wed Dec 15, 2010 3:08 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type engine Idea/need input
Replies: 31
Views: 22412

Re: Alpha type engine Idea/need input

Pressure change does not occur at the power piston in a gamma configuration. The power piston reacts to the change in pressure inside the whole closed sytem. In a gamma type most people place the power cylinder take off on the cold side so if what you are saying is correct then when air is moved to ...
by derwood
Wed Dec 15, 2010 11:40 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type engine Idea/need input
Replies: 31
Views: 22412

Re: Alpha type engine Idea/need input

I think I'm possibly the only person who gets the idea here... as far as I can tell, what derwood is talking about is not really an alpha or gamma type engine... the closest thing I can think of would be the "moving cylinder" types, as in this design "displacer" doesn't make sen...
by derwood
Tue Dec 14, 2010 9:31 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type engine Idea/need input
Replies: 31
Views: 22412

Re: Alpha type engine Idea/need input

Nice! Here is a sketch of what I was talking about

Image
by derwood
Tue Dec 14, 2010 7:17 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type engine Idea/need input
Replies: 31
Views: 22412

Re: Alpha type engine Idea/need input

First of all, thanks for having this discussion with me. In order to build an efficient working model I have to understand the process. I guess I did not understand the process correctly. I thought that with a gamma, the displacement cylinder had a hot side and a cold side and that the air flowed fr...
by derwood
Tue Dec 14, 2010 12:02 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stupid Question
Replies: 1
Views: 3239

Stupid Question

Here it goes! If a standard alpha engine was refitted with a larger regenerator and heat was applied to the regenerator instead of one of the compression cylinders, would it possibly function like a lamina flow? I ask this because of the sealing and friction issues at the hot cylinder. Be gentle!
by derwood
Mon Dec 13, 2010 11:09 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type engine Idea/need input
Replies: 31
Views: 22412

Re: Alpha type engine Idea/need input

Think of a normal alpha 180 deg. instead of 90 deg. The pistons would now be displacing air from one cylinder to the other. No compression would be taking place. It would be logical to refer to them as displacement pistons now. a power piston branching off at the regenerator. that is it. Hot and col...
by derwood
Mon Dec 13, 2010 4:31 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type engine Idea/need input
Replies: 31
Views: 22412

Alpha type engine Idea/need input

I don't know exactly what type this would be or if it will work. After building a gamma engine from old vw cylinders (it did work), I noticed that the biggest problem I had was keeping the hot side hot and the cold side cold. The engine would not run long without water or an ice pack. My idea would ...