7 1/4 Jinty

[ukjimoo]

Hi all

I am in the early stages of scaling up Martin Evans 5" Jinty to a 7.25" guage.
I am working from the issues of Model Engineer and have not obtained the full size drawings yet.
In the magazine there is a drawing of a wheel showing the dimensions and where the weights are positioned on the middle and outer wheels but there is no information at all regarding the spokes.
I wondered if anyone with the full size drawings could tell me if this information is on them or not?

Many thanks
Jim

[baggo]

Hi Jim,

According to Mike Sharman's 'Wheel specifications for the modeller' the wheels for the 3F have 15 spokes with the crankpin in line with one of the spokes.

John

[simonwass]

Somebody already does the design & possibly castings for a 7 1/4" 3F tank.
I cant remember who though!

[ukjimoo]

Thanks guys

Simon, you maybe thinking of Chris Finken of Miniaturerailway.com
I tried emailing him a few times in the past and now his website has disapeared

[billwright]

Hi ukjimoo.
I started on a 7 1/4" jinty two years ago. I had to convert the measurements from the 5" drawings. [Multiplying everything by 1.45] The worry was the valve gear but everything turned out fine. If you want any help or pictures you can email me.
[e-mail]. Bill.