G'day
MaxBrilliant!
Your explanations make logical sense to me and you have
the technical understanding whereas I fall short.
The
Champion shrouded fan mower remains an enigma.
It seems to be on the cusp of mainstream engine makers offering
affordable small air cooled rotaries for AUS rotary makers ...
Local mower makers 'made do' in the interim.
For the record, the idea of small rotary engine fan forced cooling is
much older. Reel mower maker fan-forced cooling is older again.
I know the British
Rotoscythe was offering fan forced cooling
on their rotaries in the interwar years.
These were sold here!
None have been recorded here!
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/ubbthreads.php/ubb/download/Number/17957/filename/1939_01_sundaymail_22january_p5s.jpg)
Max, I do want to thank you for raising this topic.
No one here has done that!
My most general view is that AUS rotary makers were aware
of small fan-forced engines made overseas, but they had no access
to them in a constrained post-war environment.
Aussies came up with cheaper and novel solutions:
the Victa Fan Mowers; the Champion 'Cake Tin' coolers; and the
Villager 'Twin Coolers' all were novel approaches.
All of this changed when overseas engine maker came on board
and offered us cheaper and available fan-forced air cooled engines.
We're talking late 1950s.
By this time, Victa got the knowledge to do it here.
The rest is history.
Cheers
Max----------------------
Jack