<VV> Fan and Shroud

[J R Read]

Well, that was much more than a mere picture.  The diagram shows (I assume) 
a late model fan with 24 blades (vanes) evenly spaced.  The magnesium fans 
have 11 blades and are not evenly spaced.  I know nothing about fan 
technology, but now wonder if the spacing has anything to do with air flow. 
I've always assumed that the uneven spacing had to do with harmonics and 
noise level.

Later, JR


----- Original Message ----- 
From: <ScottyGrover at aol.com>
To: <virtualvairs at corvair.org>
Sent: Thursday, May 17, 2012 9:37 AM
Subject: Re: <VV> CHT Re: valve seats and "Ping"


> try this one
>
>
> In a message dated 5/16/2012 3:17:00 P.M. Pacific Daylight Time,
> hmlinc at sbcglobal.net writes:
>
> Got  pix?
> Later, JR
>
> ----- Original Message ----- 
> From:  <ScottyGrover at aol.com>
> To: <virtualvairs at corvair.org>
> Sent:  Wednesday, May 16, 2012 4:49 PM
> Subject: Re: <VV> CHT Re: valve seats  and "Ping"
>
>
>>I have designed a series of fans for the purpose of  improving the air 
>>flow
>> through a Corvair's engine. the problem with  any of the factory stock
>> units
>> is  that there is too  much space between the fan and the upper shroud
>> (turkey  roaster)  which allows air to go back by the fan (the technical
>> term
>>  is"reversion.")  my latest fan design involves a fan with blades which
>> rise  up
>> into the airstream and a "fan ring" which  fastens to the turkey roaster
>> and
>> which minimises the gap  between the fan and fixed-position parts.  This
>> allows less air  to revert over the fan blades, keeps the air and the
>> pressure going  through between the fins where it belongs.
>>
>> Scotty from  Hollyweird
>>