[R-390] The OD discussion (Dead Horse Walking)

[Flowertime01 at wmconnect.com]

Craig said,

> For some reason, the engineers which designed our beloved 
> R-390/A chose not to use ceramic disc caps for bypassing, 
> etc. 

The year had something to do with it.

Ceramic disc with mil spec ratings were not yet in existence.

I am not sure Ceramic disc caps even existed in 1950.


> During the design process, life is a multi choice test. You may only choose 
> answers from a select list of available parts.
> 
> Available parts being defined as existing in a mil spec catalogue.
> 
> Collins was waging a paper struggle to get lots of R390 parts in the mil 
> spec approved list. They just saw no need to fight the process for caps.
> 
> Sheet metal and gears are one thing. sort of give me's.
> 
> The mechanical filters were a bit more effort.
> 
> The caps were just to accept what was listed.
> 
> This was a cost reduction program.
> 
> 


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