Power reverser for small scale loco

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Posts: 40
Joined: Sat Aug 06, 2011 11:51 pm
Location: New zealand, Wellington

Power reverser for small scale loco

Post by pollockmarine » Mon Jul 22, 2019 2:58 am

Evening/Morning team,

I know this subject has probably been covered numerous times but would like to ask for your input once again, I'm planning on fitting a working power reverser on my 3/4 nyc u3a so wondering if any one can point me in the direction of castings of a ragnoyt reverser and should it run off steam or boiler water at head pressure.

Thank you

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Joe Tanski
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Location: Eden ,New York

Re: Power reverser for small scale loco

Post by Joe Tanski » Mon Jul 22, 2019 7:06 am

I have one built for my new B&O 3/4 scale P7 (Friends Models sells the castings)nice to hang on the side of the engine for looks ,have tested mine on air design works fine , but I Will not have it run the valve gear,valve gear is hooked up direct to reverser screw in cab by rod that also moves reverser and valve gear. This way it holds the valve gear right where I set it with no darn leaks or drips or movement of valve gear.
its hard enought to make a 3/4 engine run right with out adding complex assessories !!if you want your engine to run Keep IT SIMPLE (in operation)

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Re: Power reverser for small scale loco

Post by Asteamhead » Mon Aug 05, 2019 12:49 pm

Hello pollockmarine,
Built one for may class A of 5" gage (scale 1 in 10) last year.
Works fine on air and boiler water, too. I prefer water from the delivery line of the water pump (or the injector) due to the lower temperatur, yet. My fit for your model, too?
For more information, please see my topic 'A with Timken running gear'.

A power reverse_1146red.jpg
Power reverse scale, 1 in 10. stroke about 1 1/2 "
A power reverse, cylinder parts_1045red.jpg
Power reverse, made of bronze
A power reverse, scale 1 in 10_1675 red.jpg
Power reverse built for my A, running on hot water

Wayne Davis
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Re: Power reverser for small scale loco

Post by Wayne Davis » Mon Aug 05, 2019 9:38 pm

There are plans for a power revers in Modeltec January 1985 with a follow up correcting some errors in in March 1985.


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Re: Power reverser for small scale loco

Post by Dick_Morris » Mon Aug 05, 2019 9:53 pm

I believe that Baldwin took over the Ragonnet design and marketed it under their own name. I have a 30 page instruction book on the BLW gear if you are prompted to kit bash the Modeltec drawings.

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Re: Power reverser for small scale loco

Post by squandt » Mon Aug 05, 2019 11:02 pm

Hello, there is a print on the IBLS wed site for a small power reverser under the construction header, I built one from the print for my 4-8-4 northern in 3/4 scale, works very well on air, have not yet been able to try it on steam/hot water as my boiler is not finished. There are many cool things to make for your engine on this site, you can join the IBLS ,it is a great place to find info you can use.
stay on the shine side of the rail

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