Bill Steer wrote a series of excellent (IM not very HO) articles in Model Engineer (ME) about superheaters.
This index will let you find the references, if you search Bill Steer
The very thorough crucial articles for practical construction techniques are in three consecutive issues of ME, Volume 104, published 2010.
Issue Number 4368, 31 December – 14 January 2010, page 24 covers solid return bends manufacture.
Issue Number 4369, 15 – 28 Janury 2010, page 85 continues solid return bends & brazing, and starts arrowhead return bends.
Issue Number 4370, 29 January – 11 February 2010, page 160 continues arrowhead returns, and brazing of same.
I used the methods Mr Steer advocated to make arrowhead return bends in copper superheater tube with great success. I used hollow oblong section tube to make the tool to hold the tubes for brazing rather than using solid material as he advocated, but otherwise followed his method exactly. I used the tube simply because I had some to hand and 'it would do the job'.
Regards,
Phil.
Edited By Weary on 27/03/2014 22:49:39