Re: That Forney is a Fairlie (or a Mason Bogie?)
*Fox clasps his paws over his ears and goes running from the room screaming about some odd pain between the ears...!* Check the Masterclass '02 items on mylargescale.com for lots of info on Mason Bogies. Unless a lot of people are really off base the Bogies are single Fairlies with a few improvements. The two inventors conversed with each other and made improvements to their own locos based on the others work. They were all simple engines and a single fairlie is a one-ended device. ;] The overhead lifting bar was done for the earliest walscherts valved locos to minimize any errors involved with the bogie going through curves. The Stephenson's valves locos didn't have this. :] Interesting story overall. :) Trot, the fox who's got his nose in multiple net.places... On Fri, 12 Apr 2002, Keith Taylor wrote: > I think you've stated the Mason Bogey question fairly, but to an old Fogey > it seems that a Fairlie is not a Phoney Bogey but a fairly funny Fairlie > Simple, simply! Is a Fairlie Double bogey a fairly simple Mason Double > Fairlie Bogey? And just how many seashells did she sell by the seashore, and > did they use a Mason Bogey to ship them to the shore?! > Keith Taylor, who now has confused himself even more than before! /\_/\TrotFox\ Always remember, ( o o ) AKA Landon Solomon \ "There is a >\./< [EMAIL PROTECTED] \ third alternative."
Re: That Forney is a Fairlie (or a Mason Bogie?)
Roundhouse insists that it's locos run on small radius track. I suspect that is why they "cheated" on the Forney design. Phil > > > Was there any real difference in basic design between a Mason Bogie and > a Single Fairlie - or is a Fairlie by definition a double-ended device? > Just curious. > > Farlies were made in both double and single versions and are known as > such. > > > > > It clearly raises the possibilty that Roundhouse may be thinking of producing a Double Fairlie... > > I doubt this but. > > Sam E
Re: That Forney is a Fairlie (or a Mason Bogie?)
Was there any real difference in basic design between a Mason Bogie and a Single Fairlie - or is a Fairlie by definition a double-ended device? Just curious. Farlies were made in both double and single versions and are known as such. > > It clearly raises the possibilty that Roundhouse may be thinking of producing a >Double Fairlie... I doubt this but. Sam E
Re: That Forney is a Fairlie (or a Mason Bogie?)
Hi Pete, It is I, Earle. Underneath the front of the Forney what they have done is attach the frame with bogies, cylinders, etc. to the bottom of the boiler with a pivot about 2/3 the way back. The valve gear runs on twin eccentrics inside the frame and there is a reversing piston setup at the front of this articulated frame between the cylinders. The steam gets to this reversing assembly via one flexible hose attached to the copper feed line via the "superheater" at the bottom of the smokebox. There is a second flexible hose carrying the exhaust back into the smokebox and up the chimney. The Forney is also equipped with piston valves instead of slide valves and I believe is unique to the Roundhouse line in this respect. With this setup it seems to me that this type of "engine" could be the front engine of a mallet or other articulated, two engine locomotive with very little work. Just a matter of being able to keep steam pressure up while supplying two engines off of one boiler and regulator. The reversing linkage would have to be different however. Makes for some interesting possibilities...Earle Jones > Earle came over last weekend with his new Roundhouse Forney, and was delighted that it performed well, steaming nicely and pulling my freight. > > However, I was interested to see that it is not actually a Forney - the front chassis swivels - so it is a Single Fairlie, or perhaps a Mason Bogie?
Re: That Forney is a Fairlie (or a Mason Bogie?)
The Mason Bogie is a type of > single Fairlie, but I don't think all single Fairlies can be equated to Mason > Bogies due to peculiarities like that. Vance, I think you've stated the Mason Bogey question fairly, but to an old Fogey it seems that a Fairlie is not a Phoney Bogey but a fairly funny Fairlie Simple, simply! Is a Fairlie Double bogey a fairly simple Mason Double Fairlie Bogey? And just how many seashells did she sell by the seashore, and did they use a Mason Bogey to ship them to the shore?! Keith Taylor, who now has confused himself even more than before!
Re: That Forney is a Fairlie (or a Mason Bogie?)
I believe it's a single Fairlie. Mason's design also included a bizarre (my opinion only) valve gear arrangement that hung over the boiler on a yoke, with reach rods dropping down to the cylinder level. The Mason Bogie is a type of single Fairlie, but I don't think all single Fairlies can be equated to Mason Bogies due to peculiarities like that. regards, -vance- Vance Bass Albuquerque, New Mexico, USA Small-scale live steam resources: http://www.nmia.com/~vrbass
RE: That Forney is a Fairlie (or a Mason Bogie?)
Pete, If I recall correctly from my reading, a Mason Bogie also has one high-pressure and one low-pressure cylinder in compound, and that is one basis for the Mason Bogie patent. Steve -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Friday, April 12, 2002 8:17 AM To: Multiple recipients of sslivesteam Subject: That Forney is a Fairlie (or a Mason Bogie?) Earle came over last weekend with his new Roundhouse Forney, and was delighted that it performed well, steaming nicely and pulling my freight. However, I was interested to see that it is not actually a Forney - the front chassis swivels - so it is a Single Fairlie, or perhaps a Mason Bogie? According to my brief research, if it has a single pivot/steam pipe it is a Mason Bogie? I didn't have time to take a close look at Earle's loco. Was there any real difference in basic design between a Mason Bogie and a Single Fairlie - or is a Fairlie by definition a double-ended device? Just curious. It clearly raises the possibilty that Roundhouse may be thinking of producing a Double Fairlie... Pete
