<VV> Corvair Fan

[JVHRoberts at aol.com]

Fortunately, there are better materials than Delrin. But then again, an  
investment cast aluminum fan should work just fine, and MUCH cheaper to do in  
what no doubt will be a small run of parts. 
 
In a message dated 7/10/2005 12:44:43 AM Eastern Standard Time,  
BobHelt at aol.com writes:

> we  would like to make the production fans out of something
> much lighter  than aluminum; perhaps a modern plastic. (But it needs to be
> one that  doesn't react with battery acid fumes. We all know the story of 
the
>  prototype Delrin fan creating formaldehyde gas!) There will be a
>  price/performance decision to make.
> 

Well, we don't want a  repeat of that fiasco, but remember that the problem 
came about (according  to Bob Benzinger) because of a GENERATOR charging at 
the 
high limit. This  was late 1961. Hopefully alternators would not cause the 
same  
problem.