The Dorset Wanderer Posted June 23, 2012 Share Posted June 23, 2012 I need to know the diameter of an M7 boiler. From the drawings I have it would seem to scale at 13mm in 3mm scale. However, this is hampered by the handrails being almost parallel to the boiler in plan view. The actual size would be very helpful. Steve Link to post Share on other sites More sharing options...
34theletterbetweenB&D Posted June 23, 2012 Share Posted June 23, 2012 I happen to have a Roche drawing of the M7 for 4mm scale. Scaling off the largest vertical dimension on the drawing (overall height) it is printed approximately 1% oversize in this dimension. So I reckon the measured 19.2mm over cladding, represents a diameter of 4'9". Link to post Share on other sites More sharing options...
Guest Belgian Posted June 23, 2012 Share Posted June 23, 2012 I happen to have a Roche drawing of the M7 for 4mm scale. Scaling off the largest vertical dimension on the drawing (overall height) it is printed approximately 1% oversize in this dimension. So I reckon the measured 19.2mm over cladding, represents a diameter of 4'9". Not a bad estimate: it's actually 4' 9½", as per the original construction drawings from Eastleigh. JE Link to post Share on other sites More sharing options...
The Dorset Wanderer Posted June 23, 2012 Author Share Posted June 23, 2012 Thanks for that Steve Link to post Share on other sites More sharing options...
Guest Belgian Posted June 23, 2012 Share Posted June 23, 2012 As a matter of interest, the GA drawings are in the back of Don Bradley's book from Wild Swan 'An Illustrated History of LSWR Locomotives: the Drummond Classes', an absolute 'must' for anyone building models of such locos. JE EDIT: ISBN 0 906867 42 8 Link to post Share on other sites More sharing options...
billbedford Posted June 24, 2012 Share Posted June 24, 2012 From a LSWR GA:- 4' 5 1/2" inside the larger boiler ring 4'9 1/2" over the cladding. Link to post Share on other sites More sharing options...
The Dorset Wanderer Posted June 24, 2012 Author Share Posted June 24, 2012 Bill- so in 3mm scale I could get away with 13mm for the boiler over its length adding a wrap over the smokebox- do I read that correctly? Steve Link to post Share on other sites More sharing options...
billbedford Posted June 24, 2012 Share Posted June 24, 2012 The dead scale dimension in 3mm scale would be 14.375 mm, so 14 mm would probably be better than 13 mm. Link to post Share on other sites More sharing options...
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