Search found 308 matches

by Aviator168
Sat Apr 04, 2015 6:22 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My 18cc Alpha Stirling Engine
Replies: 28
Views: 18499

Re: My 18cc Alpha Stirling Engine

The simplest would be just connect a small tube from the cold cylinder ( at the location when the piston is at BDC) to the crank. Don't need any spring at all unless you plan to move the location of the valve to different places in the future to have difference engine speeds like an ICE. Just curiou...
by Aviator168
Thu Apr 02, 2015 2:53 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: calculating relative dimensions
Replies: 11
Views: 7281

Re: calculating relative dimensions

I will go with an alpha configuration. Just build two of the same cylinder. :laugh:
by Aviator168
Tue Mar 31, 2015 3:04 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My 18cc Alpha Stirling Engine
Replies: 28
Views: 18499

Re: My 18cc Alpha Stirling Engine

You need a valve to balance the pressure between the crank and the engine when the engine's internal volume is largest. This is also the mechanism to pressurize the engine which is by pumping more gas into the crank case.
by Aviator168
Tue Mar 31, 2015 8:48 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22661

Re: Stirling engine with rhombic drive 75 ccm

ss is the problem. Thermo conductivity 15. Go with cast iron which has thermo conductivity of 65.
by Aviator168
Mon Mar 30, 2015 12:52 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Engine Idea help!
Replies: 5
Views: 4838

Re: Engine Idea help!

So. Instead of using a displacer, you move the chamber between hot and cold. I don't see why not. Just that the temperature difference between hot and cold water is not going to make you any useful power. On top of that moving the entire chamber requires more energy than moving a displacer.
by Aviator168
Mon Mar 30, 2015 11:55 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22661

Re: Stirling engine with rhombic drive 75 ccm

Hi Ralf, a few things. The environmental pressure never equal the mean working pressure and some times wont equal to the low working pressure. I am more familiar with alpha. Depending where sniff value is, the low pressure can be equal or lower than the environmental pressure. In the case of no snif...
by Aviator168
Mon Mar 30, 2015 8:37 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22661

Re: Stirling engine with rhombic drive 75 ccm

Not quite Ian. That's assuming you have no dead volume. Most home builts have a bout 30% dead volume.
The correct calculate final pressure is as

3 * P1 * V1 / 2 + amount of heat added = 3 * P2 * V2 / 2

Also, when you said double the temperature, how do you really know the temperature is doubled.
by Aviator168
Sat Mar 28, 2015 6:18 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My 18cc Alpha Stirling Engine
Replies: 28
Views: 18499

Re: My 18cc Alpha Stirling Engine

Very nice. What is the power output?
About cooling. Why was jacket type cooler use?
by Aviator168
Fri Mar 27, 2015 2:01 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: can a laminar flow stirling engine do real work
Replies: 5
Views: 11226

Re: can a laminar flow stirling engine do real work

Same issue as other stirling engine. Problem with getting a lot of great in and out
by Aviator168
Fri Mar 27, 2015 8:08 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha stirling displacement.
Replies: 24
Views: 12609

Re: Alpha stirling displacement.

Better thermal penetration, and at the same time reduce thermal conductivity to the rest of the system so you don't get a "thermal short".
by Aviator168
Thu Mar 26, 2015 5:54 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Beta Stirling Project
Replies: 27
Views: 14332

Re: Beta Stirling Project

IIRC. The bottom of displacer and top of the power piston is closest when the displacer is half way down and the power piston is at TDC. In other words, the power piston lags the displacer by 90 degrees.

http://www.animatedengines.com/stirling.html
by Aviator168
Mon Mar 23, 2015 10:11 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha Stirling Engine Project
Replies: 24
Views: 25516

Re: Alpha Stirling Engine Project

I see the cold piston sticking out. Why is that?
by Aviator168
Mon Mar 23, 2015 8:38 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22661

Re: Stirling engine with rhombic drive 75 ccm

Fine. When using 2.7 bar, the Beale number still has to be 2x the maximum for AR's engine to generate that power.
by Aviator168
Sun Mar 22, 2015 2:44 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22661

Re: Stirling engine with rhombic drive 75 ccm

I put AR's number into the formula. The Beale number has to be much higher to make sense.