Garden Railway Forum

Has anyone built an Osmotor type device using mamod cylinders, or has any one seen a plan for such a device?

What is an Osmotor? Probably best asked over on the Mamod forum.

Sorry, an Osmotor is an oscillating cylindered power unit, sometimes known as a steam motor. It is two cylinders back to back with a port block between and a geared output drive.

After recent comments on the forum about Ozmotors I had wondered if this was a possibility. I think the main problem would be making it narrow enough to fit between the frames for 32mm gauge. I think a home made port block is the answer but I have not yet measured it up. I am sure someone somewhere must have made one.

Rob

robc_wa:116636 wrote:After recent comments on the forum about Ozmotors I had wondered if this was a possibility. I think the main problem would be making it narrow enough to fit between the frames for 32mm gauge. I think a home made port block is the answer but I have not yet measured it up. I am sure someone somewhere must have made one.

Rob

Sorry, it isn't the port block that is the problem it's the bit from which the steam goes into them, which in a mamod loco is the reverser block. That would need to be narrowed down. Mamod do a twin cylinder marine motor which gives some idea of how an osmotor using standard components would look.

http://www.mamod.co.uk/shop-categories/ ... ing-engine

For railway usage the power take of gear would obviously be between the cylinders

Rob

Have a look at Dave Watkins' drawings for "brick"

http://www.16mm.org.uk/newsite/files/default.html

Or Tony Bird's Aderyn steam motor.

http://g1mra.myfastforum.org/Tony_Bird_ ... ut391.html

Hi Jim,

I designed and a friend made an Osmotor type steam motor using a pair of Mamod cylinders. The engine is fitted to one of the bogies of a model of Monarch which is now at the W&L. The model is G1 there isn't enough room for a pair of Mamod cylinders between the wheels in '0' gauge. The model of Monarch isn't finished but it has had a test run when it worked really well. I don't have any photographs but if any one is interested I could take some when I see the chassis again in a couple of weeks time.

Below are two photographs of one of my steam motors fitted to a '0' gauge test chassis. They work OK but really are a bit small and have to be quite well made to work well.




Regards Tony.

Thanks for all the advice folks.
I intended to try and put some of it into practice soon, but sadly the prospect of a considerable amount of time off that looked so likely a few days ago has proved a slip.

Never mind there is always next year!

From a Yahoo Group archive.


Click to download file

Chris Cairns