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This is my first beta stirling engine !!

Posted: Tue Jun 06, 2017 4:16 am
by thanh-cuibap
This is my first beta stirling engine !
Thanks Forum and Ian S C - My teacher of stirling engine !

https://www.youtube.com/watch?v=W1--bo1bmrg

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Re: This is my first beta stirling engine !!

Posted: Tue Jun 06, 2017 5:50 am
by Ian S C
Looks very good. I see you have fitted an oiler, don't get too carried away with oiling the piston, the motor will get gummed up, and you will need to strip it down to clean it inside.
Ian S C

Re: This is my first beta stirling engine !!

Posted: Tue Jun 06, 2017 7:33 am
by thanh-cuibap
Thanks Ian !!
And do you remember this :
"" Re: Sterling Diaphragm Engine
Postby Ian S C ยป Sat Dec 31, 2016 3:06 pm

A thing that will give you a good cylinder for a motor is the internal cylinder of a automotive shock absorber, these are about 400 mm long, with a bore of 25 mm to 40 mm, you might be better looking at motor cycle telescopic front forks.
Ian S C""
I used motorcycle telescopic front forks for cylinder of Beta Stirling and It run excellent !!!
THANKS IAN !!!!!!!!!!

Re: This is my first beta stirling engine !!

Posted: Wed Jun 07, 2017 2:38 am
by Ian S C
It's good to use a ready made cylinder as this is probably the most difficult part to get perfect.
Ian S C

Re: This is my first beta stirling engine !!

Posted: Wed Jun 07, 2017 5:03 am
by flash3780
That looks really good! How tight is the piston radial clearance? Commercial engines use low friction coatings on the piston, and maintaining tight clearance can be important for efficiency (and tricky).

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Re: This is my first beta stirling engine !!

Posted: Wed Jun 07, 2017 6:10 am
by thanh-cuibap
flash3780 wrote:That looks really good! How tight is the piston radial clearance? Commercial engines use low friction coatings on the piston, and maintaining tight clearance can be important for efficiency (and tricky).

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Thanks Flash3780 !!
- I don't know exactly the piston radial clearance . I don't have digital calipers , I made piston very slowly and check step by step with bore cylinder until the pistons are fit and gentle movement in the cylinder ..
- What is material to use for low friction coatings on the piston ??

Re: This is my first beta stirling engine !!

Posted: Thu Jun 08, 2017 2:50 am
by Ian S C
There is a Teflon coating that can be put o the likes of aluminium pistons, it's called Xylan, this is baked on, and you would have to find a commecial firm to do it for you. With a steel cylinder, cast iron is the best metal to use. With the polished cylinder that the above motor uses graphite would be the very best.
Ian S C

Re: This is my first beta stirling engine !!

Posted: Thu Jun 08, 2017 4:43 am
by thanh-cuibap
Thanks Ian !!

Re: This is my first beta stirling engine !!

Posted: Sat Jun 10, 2017 2:36 pm
by Trevor
Hi Thanh - I Have been away for several weeks out in the desert without any internet and couldn't contact anyone, but now home with a very sick car.
Anyway! That is a very impressive engine and looks so great.
Do you have plans for that one Thanh or is this one from your head. - I like It -
Trevor

Re: This is my first beta stirling engine !!

Posted: Sat Jun 10, 2017 10:37 pm
by thanh-cuibap
Hi Trevor !! Nice to see you again.
I don't have plans , because I just think, calculate, draw on paper and do, in the process of doing, thinking, drawing on paper and doing ... you can see this link to understand my way.

viewtopic.php?f=1&t=2153&p=11339#p11339

But I give you the information of engine that I just measured

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Re: This is my first beta stirling engine !!

Posted: Sat Jun 10, 2017 11:52 pm
by Trevor
Thanks Thanh. I think I will build one of these when I finish my LTD engine.
Nice work from your lathing. You are doing a good job
Trevor

Re: This is my first beta stirling engine !!

Posted: Sun Jun 11, 2017 8:00 am
by thanh-cuibap
Thanks Trevor ! And I want to see your LTD engine when it finish.

Re: This is my first beta stirling engine !!

Posted: Sun Jun 11, 2017 10:53 pm
by Trevor
Yep! That's a promise Thanh. It's the when.....

Re: This is my first beta stirling engine !!

Posted: Thu Jun 15, 2017 8:42 am
by Eric R_o_M
I can't seem to get my head around how that elegantly machined crankshaft works-- it looks like one piece has to go thru itself!?

(Obviously not.) Do you have closeups of that particular bit?

Lovely work.

Re: This is my first beta stirling engine !!

Posted: Thu Jun 15, 2017 7:15 pm
by thanh-cuibap
Hi Eric R_o_M !!
I do not understand what you mean ! which part don't you understand ?? ( sorry my english is not good ).