You sure don't Al, if it was mine I'd be aiming for perhaps half of AJ's suggested figures > If this is a working display model, you don't want it > operating so fast that the workings of the motion are > blurred, do you? > > Al Messer > > --- alan Stepney <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> > wrote: > > > As far as I am aware, there is no absolute formula > > for speed against engine > > size. > > There are many rough guides, with the actual > > limiting factors being, the > > valve gear, inertia in moving parts, and general > > inefficiency, plus the > > normal design criteria. > > > > At a guess, that size of engine would probably turn > > at around 500-600 rpm > > without too much trouble. > > It is quite a long stroke for the bore, which will > > limit speed. > > > > Alan > > > > > > > > ----- Original Message ----- > > From: "Pcx" <pierre.courbouleix@xxxxxxxxxx> > > To: <modeleng@xxxxxxxxxxxxx> > > Sent: Tuesday, September 06, 2005 7:24 PM > > Subject: [modeleng] Tr: Re: Steam engine RPM ? > > > > > Hi All, > > When discussing with a friend we had this question ( > > may seem crazy to the > > most experienced of You), for which we found no > > reliable answer, how to > > calculate (estimate?) the running speed of a steam > > engine (RPM) knowing the > > type of engine (single/double acting, condensing/non > > condensing), the > > stroke,the bore and the inlet steam pressure ? For > > your info we are building > > an horizontal slide-valve steam engine 1 1/2 bore, 2 > > 1/4 stoke , of a type > > inspired from an old design . > > > I thank you for your help and the infos you can > > forward .... > > > Regards > > > > > > pierre.courbouleix@xxxxxxxxxx > > > Pierre > > > > > > MODEL ENGINEERING DISCUSSION LIST. > > > > To UNSUBSCRIBE from this list, send a blank email > > to, > > modeleng-request@xxxxxxxxxxxxx with the word > > "unsubscribe" in the subject line. > > > > > > > > ______________________________________________________ > Click here to donate to the Hurricane Katrina relief effort. > http://store.yahoo.com/redcross-donate3/ > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email to, > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line. > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.