Ghost123 think you folks in the UK are very steeped in tradition (nothing wrong with that) I own paws 03,06,09, 19, and a 40 with the
40 I think PAW made the leap to a balanced larger engine,you must remember that a glow engine by defination is a semi-diesel granted the action of the the alcohol thru catalytic action keeps it hot and running Bob davis reasoned more than 25 years ago that a modern balanced glow engine would run quite well with a compression head that you of course vary the compression just like the little ones and time has proven him quite right thus we have a large choice of larger engines converted to diesel a case in point is the MVVS 61 which you can get with both a glow and diesel head break in in glow then converted to diesel the advantages are more power
and less fuel consumed than running alcohol based fuel in the glow versions of all the conversions, on the tradition thing Paul Landel
of Just engines was here in Florida on a holiday we met and I took him flying. He was surprised I was running muffler pressure on a Irvine 53 conversion diesel quote "we do not do that in the UK" and he was right as far as the paws went but the modern conversions
with the stock glow carbs do not have the suction of the small diesel ones and now of course Enya took the leap and the 25 is available
as a diesel see posts on this site on them so yes at least here more folks are using the big ones I think the same has happened with t your cousins "down under" also.I am certainly not knocking the small traditional ones { I own some) but they really come on in the 40 thru 90 class planes hope this helps martin as a footnote some of the guys have converted the larger petrol ignition engines to diesel