I think that maybe the lack of comment is as Hopper says because of an unfamiliarity with Don's work, I would recommend anyone who is building or contemplating any steam locomotive or engine to look at Don's website and book. I have seen many questions asked about valve setting on various forums that could be answered by reference to Don's work.
I struggled with Rob Roy's valve setting for a very disappointingly long time (pre internet) and could not get it to run satisfactorily, reading Martin Evans and LBSC didn't help much. I saw Don's stevensons booklet at a M.E exhibition at Wembley , his simple jig made in an afternoon for setting the eccentrics ended weeks of frustration and probably prevented another unfinished chassis being up for sale.
The content does appear maths heavy at first, I am certainly no maths genius, don't let that put you off there is sound practical advice contained in all his works, removing uncertainty, no more trying to set return cranks with a pair of dividers, something I for one could never manage.
As Julian says Don was certainly a beacon of light, for me personally at any rate, if there was a system of donation to keep his website open I would be pleased to contribute.
Dave
Edited By Dave Wootton on 16/04/2020 06:31:20
Edited By Dave Wootton on 16/04/2020 06:31:50