Graphite Bar

[Norris]

I recently purchased a bar of graphite, 120mm long X 30mm diameter. Since then I have decided not to use it. Does anyone want it? It cost me £18 so that is what I want for it and I will pay the postage.

[jwegmann]

Dear Mr Norris,
Probably you are using a language methaphoric,or are yuo kidding.
Yesterday I posted you in detail,sadly I pressed a botton store the mail!I am sorry.
This time I´ll be brief.
1.-The misconsideration of this marvellous Stierling,any type,that now is reviving a new wave,
it was science of materials, or MMC´s,Metal Matrix Composites.Cheap,stable,low frictio,sel lubricated,dimensionally stable under high Temps,good machinability, and traditional
Melting tecniques.
2.-See please UWM, photo, one cylinder and piston in MMC´s,graphite-Al MMC´s and or
al SiCMMC´s, for Diesel engines.
3.-Another photo one professional with cilinder liner probably home made.He said have eliminated rings,honing and lapping.UWM and Brunnel of UK,you have al the recipe
to reach this metallurgy that will change the future od Stirling,Conrods also have been also conformed with carbon fibre,to me Ms Sc i Mech.Engr,the State of stress/Strains,is tremendous
more in Diesel due to high Torques.Get in Google take the recipe, or access to MMC´s
suppliers in USA,CHINA,INDIA, ingots to be remelted.
Dont let you down, blocks,Heads,Crankcases make me Design on the basis of 90 HP
for Motorglider, similar to Stemme I,grahite fiber, used in formula 1,is wonderfull.
I finish, I have been 9 years in FEA,Finite Elements Analysis, and CAD ,Autodesk 3D,and
smellin in Solids Work.There you have Machine elements modules, or any solid,Heat Trans
fer,Fluid mechanics,Composites,and Events simulation linear and non linear.
I am in love with S.E.Alpha,V-style, dont waste time to make toys,current usa practice,
FEA ,Stiffeness Matrix show us that a small model dimensions will serve nothing for a
larger scale same model.
Some oppinions are going around that V style SE, failed and failed due to work piston.
AHHHH And beta and gamma does it no have work piston,first I worked 40 years
most of it in the range 100 to 2400 HP Marine Diesel Eng.Turbocharged,if you buy
a Maehle piston, youl never have a fail, if you control burner heat,also,But in my
calculations graphite Al MMC´s will prform fine.If Maehle piston Use 4080 and A308
self lubricated rolled.
Sincerely yours,do not hesitate to contact me.
johann wegmann

[vamoose]

Hello jwegmann

Thank you for your help on the forum. I can see you know allot about stirling engines by your forum posts.
The translation is a little hard to understand some times, but please continue with your help as we all want to help each other in our understanding.

What is your original language?
So maybe I can use 'google translate' to communicate better with you to help improve my understanding of stirling engines and sharing of information.

I also like the Alpha engines, and am looking at double acting Alpha designs at the moment.

I will also send this to you in a private message.
"Burn on"!!

[jwegmann]

Dear Friend,
1.-If you find some statement against the increase in Compresion Ratio,except max temperatur increase,please let me know,CR is fundamental to get an important increase in power output.
2.-If you can confirm me ceramic coating insulating wall, adiabatic,I´ll be gratefull,so we can dream in an adiabatic engine cycle,no water cooling.
3.-Why ringless pistons ceramic coated run on metal liners?What if we coat both liner and piston?
4.-When we can run Nichrome,Infrared,or Radioisotopes emmiters,operating temp will be programable.As an alternative to liner cearmic coated.All these emmiters inside the dead vol.Nuclear option is used in satellites since JK started the moon race.
5.-For you and others, I am calculating to add to regenerator an Refrigeration Expansion Valve
Throtling, adiabatic-isoenthalpic reversible,put a figures on, and tell me your oppinion please.Not boring you for to day.!Cheers! Witha a Jack Daniels from Tenessee.Johann

[Possert]

Dear Friend,
3.-Why ringless pistons ceramic coated run on metal liners?What if we coat both liner and piston?

Interesting thing I discovered while experimenting with nylon filament for 3D printing, materials that will stick to nothing else will stick to themselves readily and often quite strongly.
Using a ceramic coating on both parts might cause a great deal of friction.

Edit,
I do agree with you about composites and using modern materials. I've spent the last 2 days chasing down info on high temp resins and seals.
Its not just the low thermal conductivity, I would rather lay up composite parts than carve them out of metal. I enjoy working with metal but the carbon lets you do things that aren't practical with metal.

[Ian S C]

Another type of piston advocated by Andy Ross is made of aluminium with a baked on Teflon paint called Zylan, running in a bore made of aluminium which has been hard anodized.
The thing against piston rings is the added friction caused by the side pressure required to form a seal.
I'll keep with cast iron pistons, no rings, running in either steel or cast iron bores.
Ian S C