Hi Max
Many thanks for the detailed and technical explanation of the cooling styles. smile

I think the Villager patent for 'Twin Cooling' had a much better
grasp of heat flow and transfer than the Champion one.

I guess the Villager system had twin cooling blades - on the
blade holder and on the flywheel.

Max, I collected a small image from VM some time ago.
I can't say whether it is original or a backyard mod.

[Linked Image]

It was a clear move to a shrouded fan but I have found
no evidence that it was a Champion production part.

Someone went to a lot of trouble ...

Cheers and thanks
--------------------------------
Jack