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.