Radial-Diametral Head

[Hans Hintermaier]

Hi Stuart,
no, it was not aspin, they could not make it long-lasting, because it 
was not a disk, but a cone. It's hard to keep distance as small as 
possible between the cone and the head.
A disk valve system as you describe was successfully tested in WW2 by
BMW,  but didn't reach production stage. 
I don't know the name (maybe knight?) and I do hard to explain the principle.
The cylinderwall has slots and is turning / oscillating. Knight system had 
two coaxial slotted cylinders turning (or so)
I try to find the book where I read it.
Hans

> >The Noratlas had a 14cyl. radial with disc-valves (?).
> 
> This engine might have used Aspen (Aspin?) valves. I read about these a 
> long time ago. They had a disc mounted on a vertical shaft mounted so that 
> the lower surface of the disc was the upper surface of the combustion 
> chamber. The disc had a hole in it, and was rotated at half engine speed, 
> so that intake and exhaust ports were covered and uncovered at the 
> appropriate times. Apparently the system was sorted and reliable - ports 
> were opened faster and flowed better than with conventional valves, and 
> with no reciprocating valve train, they revved to the moon (14000rpm from a 
> 250cc single in the mid 1930's)
> 
> Stuart.
 
hiha@ brain.nefo.med.uni-muenchen.de
Munich / Germany