Search found 88 matches
- Tue Feb 05, 2019 7:41 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Whispergen mk4
- Replies: 22
- Views: 25032
Re: Whispergen mk4
Ok, will give it a shot. Maybe today.. Different question for you Ian - Your opinion on cast iron as hot side heat exchanger in "stove tope" stirling engine... Have some lovely pieces of cast iron in 150mm diameter, want to make kind of pancake covers in stead of stainless steel. Much easi...
- Mon Feb 04, 2019 4:07 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Whispergen mk4
- Replies: 22
- Views: 25032
Re: Whispergen mk4
Vinegear will eat aluminium too :( tried, also oxalic acid. The biggest problem - cooler contains also an internal sleeve made from cast iron..
Did you found any info on used solid lubricant for yoke ? It looks like mo2s grease, but i am not sure is it mineral based or silicone oil for example..
Did you found any info on used solid lubricant for yoke ? It looks like mo2s grease, but i am not sure is it mineral based or silicone oil for example..
- Sun Feb 03, 2019 6:07 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Whispergen mk4
- Replies: 22
- Views: 25032
Re: Whispergen mk4
Hi ! , no, not yet, have been busy with different projects..stil have to decide how to clean aluminium from scale..
- Thu May 31, 2018 6:30 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Whispergen mk4
- Replies: 22
- Views: 25032
Re: Whispergen mk4
Pellets yes if super quality. But no - when to much ash. I am using them for heating, quality is not constant. I will make more photo. As far as i can see and feel - it some kind of moly or graphite filled grease. Not 10w40 sure.
- Wed May 30, 2018 9:00 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Whispergen mk4
- Replies: 22
- Views: 25032
Re: Whispergen mk4
thanks for reply. I know that sad history of whisper gen. And any other kinematic stirling. And looking into it as mechanist with some metalworking knowledge and having lathes - it should be simplified. Now in the middle of cleaning. And dissambling cold hx and liner. Solid fuel or not - ground char...
- Sun May 20, 2018 9:56 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Whispergen mk4
- Replies: 22
- Views: 25032
Re: Whispergen mk4
Adittionally - if you will get in touch with one of authors, could you ask for some info on lubrication, assembly, gap in piston rings etc..
- Sun May 20, 2018 5:01 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Whispergen mk4
- Replies: 22
- Views: 25032
Re: Whispergen mk4
Mk5 was quite popular in germany, you could get them on ebay.de for 150 ey for not working, 1000-1500 used, 3000++ for new. But they have cracking hot side heat exchangers. About mine - do not imagine too. On one motor lime scale popped up cold heat exchanger and water got inside. On other dont imag...
- Wed May 16, 2018 5:56 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Whispergen mk4
- Replies: 22
- Views: 25032
Whispergen mk4
Just got two of these, dissasembling and cleaning them. Bought for scrap price as natural gas boiler. With some pressure. But not nominal.
Sad part - small rust on piston, very minor on cylinder and a lot of gum/limescale on water side of cold heat exchanger..
Sad part - small rust on piston, very minor on cylinder and a lot of gum/limescale on water side of cold heat exchanger..
- Wed Jul 22, 2015 5:53 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: dwell on displacer
- Replies: 16
- Views: 15683
Re: dwell on displacer
In theory it adds up to 20% of power for gamma, in practice it showed close to 12% increased power. Dwell was set to 50%
- Wed Jul 08, 2015 7:19 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Heat exchanger design with FastTrack, FlexiScale and ReScale
- Replies: 1
- Views: 3623
Re: Heat exchanger design with FastTrack, FlexiScale and ReScale
1. I suggest to copy Philips MP1002CA if Your engine will be air-charged. For H or He it is ok to use bigger ratio of dead-space.
2. You can do it, if you keep ratio of slot width to length, but compensate with number of slots for same purpose. In commo it is in 125-60 ratio.
2. You can do it, if you keep ratio of slot width to length, but compensate with number of slots for same purpose. In commo it is in 125-60 ratio.
- Thu Jul 17, 2014 4:26 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Big Stirling Engine
- Replies: 47
- Views: 44353
Re: Big Stirling Engine
And it producing 1 kw of mechanical power from single candle :)
- Thu Jun 12, 2014 5:43 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling essex - beta or gamma ?
- Replies: 6
- Views: 6616
Re: Stirling essex - beta or gamma ?
Yes. http://www3.nd.edu/~me463d18/Files/Derek/Sources/gamma_testing.pdf With essex, it should be even better - we could negate any dead space with common swept volume. But - gamma gives posibility to make thin-tube heat exchanger for hot end without additional piston ring... "academics" ht...
- Wed Jun 11, 2014 2:45 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling essex - beta or gamma ?
- Replies: 6
- Views: 6616
Re: Stirling essex - beta or gamma ?
Interesting info :http://arc.aiaa.org/doi/abs/10.2514/6.1994-3952 or http://papers.sae.org/929026/ Quote: It was demonstrated by analytical means, that the specific work obtainable from a Stirling type engine, with separate power and displacer cylinders, having the power cylinder connected to the ho...
- Sun Jun 08, 2014 11:58 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: Stirling essex - beta or gamma ?
- Replies: 6
- Views: 6616
Re: Stirling essex - beta or gamma ?
Does any-one have any ideas ? Does essex stirling engine is the answer to question about typical 1/1.5 ratio of power piston to displacer found in normal gamma engines with cold expansion space ?
- Wed Jun 04, 2014 10:50 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: volume of tubing vs cylinder displacement
- Replies: 6
- Views: 3739
Re: volume of tubing vs cylinder displacement
I could disagree on dead volume non importance for engine performance. Going from pure gamma to beta with common swept wolume of only 22% of working volume have added 50% more power. But, that is more important - alpha engines with only two cylinder is the worst case of forced-to-indicated case of 0...